Intralabial Lip Compartments and their Potential Clinical Relevance.

BACKGROUND: Aesthetic soft tissue filler injections for lip enhancement are highly popular and are performed throughout the world. When injecting lips with cannulas, as the cannula is advanced, resistance is perceived in consistent locations potentially indicating boundaries between intralabial compartments. OBJECTIVE: To investigate whether intra-labial compartments exist and (if so) to describe their volumes, location, boundaries, and dimensions. METHODS: This cadaveric study investigated a total of n = 20 (13 males, 7 females) human body donors with a mean age at death of 61.9 (23.9) years and a mean body mass index of 24.3 (3.7) kg/m 2. The investigated cohort included n = 11 Caucasian, n = 8 Asian, and n = 1 African American donors. Dye injections simulating minimally invasive lip treatments were conducted. RESULTS: Independent of gender or race, 6 anterior and 6 posterior compartments in the upper and lower lip were identified, for a total of 24 lip compartments. Compartment boundaries were formed by vertically oriented septations that were found in consistent locations. The anterior compartments had volumes ranging from 0.30 - 0.39 cc whereas the posterior compartment volume ranged from 0.44 - 0.52 cc. Centrally, the compartment volumes were larger and decreased gradually towards the oral commissure. CONCLUSION: The volume and the size of each of the 24 compartments contribute to the overall appearance and shape of the lips. To achieve a natural and lip-shape preserving aesthetic outcome it may be preferable to administer the volumizing product using a compartment-respecting injection approach.

Venous Tributaries of the Lip: Implications for Lip Filler Injection.

BACKGROUND: Demand for lip filler injection continues to increase. Despite the current literature's acknowledgement of the role both venous and arterial vasculature play in minor and major side effects, research addressing the venous vasculature of the lower one-third of the face is scarce. METHODS: A photographic analysis of the venous vasculature of 26 participants was performed using a vein transilluminator to display the venous flow around the perioral region. The data were analyzed for commonalities among participants and then compared with common lip filler injection techniques and locations. RESULTS: Venous tributaries were identified in all patients, with slight variation in pattern, superior to the upper vermilion border between the nasolabial fold and philtral column on each side of the mouth. Venous tributaries were noted approximately 1 to 1.5 cm lateral to the oral commissures extending inferiorly to the chin and along the labiomental crease. Four areas of venous pooling were deemed significant: a small area approximately 2 mm superior to the Cupid's bow, along the middle tubercle of the upper lip, along the wet-dry line of the lower lip; and centrally along the vermilion border between the lower lip tubercles. CONCLUSIONS: Perioral venous mapping provides a guide for injectors performing lip enhancement procedures in identifying areas at risk for injury because of venous pooling. Avoiding these anatomically vulnerable regions can minimize the potential for inflammation and ecchymosis associated with intravenous injection and prevent dissatisfactory aesthetic results because of lumps, excessive bruising, swelling, or asymmetry.

Deep Plane Anatomy for the Facelift Surgeon: A Comprehensive Three-Dimensional Journey.

Strong command of facial anatomy is paramount for all facelift surgeons. A comprehensive understanding of how aging impacts facial anatomy is equally important for effective preoperative evaluation of the patient undergoing facelift surgery. Key areas for assessment of the patient undergoing facelift surgery are addressed. This article highlights and summarizes the high-yield anatomic pearls in facelift surgery, particularly in sub-SMAS (superficial musculoaponeurotic system) dissection techniques. Emphasis is placed on the depth and transitions of the facial nerve branches and the sub-SMAS potential spaces and their role in deep plane facelift dissection. Key anatomic structures in the deep neck are described.

Mapping a Danger Zone of the Dorsal Nerve of the Clitoris: Implications in Female Cosmetic Genital Surgery.

BACKGROUND: The literature regarding the route of the dorsal nerve of the clitoris is sparse and lacks surgical focus. With an increasing number of procedures being performed on the labia, it is important to elucidate the route and note any variation from normal of the nerve. METHODS: Fifty-one cadavers were dissected to yield 97 dorsal nerve of the clitoris samples. Measurements were taken from (1) the dorsal nerve of the clitoris penetration point of the perineal membrane to the urethra, (2) the nerve's penetration point of the perineal membrane to the pubic bone, (3) the angle of the clitoris to the branch point of the dorsal nerve of the clitoris, and (4) the branch point of the nerve to the distalmost point of the glans clitoris. Any anomalous branching patterns of the dorsal nerve of the clitoris were recorded and classified. RESULTS: The means and standard deviations of each measurement were used to create a surgical danger zone. The mean of each measurement was (1) 34.63 mm, (2) 5.74 mm, (3) -3.07 mm, and (4) 30.40 mm, respectively. In addition, six distinct branching patterns were observed, organized, and classified based on the location and number of branches observed. CONCLUSIONS: The dorsal nerve of the clitoris has multiple branching patterns and typically travels along the same course in most women. Further investigation of the course and three-dimensional position of the dorsal nerve of the clitoris is warranted to preserve sexual sensation as the frequency of procedures involving the female pudendum increases.

A New Target for Temple Volumization? An Anatomical and Ultrasound-Guided Study of the Intermediate Temporal Fat Pad.

BACKGROUND: Current techniques for temple volumization primarily focus on deep or superficial targets. Further anatomical exploration of intermediate injection targets is warranted. OBJECTIVES: The purpose of this study was to examine the anatomy of the intermediate temporal fat pad (ITFP) as it relates to filler injection procedures and to explore the utilization of ultrasound technology for clinical localization. METHODS: Ultrasound technology was utilized to identify and inject red dyed hyaluronic acid filler into the ITFP in 20 hemifacial fresh cadavers. Cross-sectional dissection was performed to confirm injection accuracy and document pertinent anatomical relationships. The same technique was performed in a single clinical patient case employing ultrasound guidance and injectable saline. RESULTS: The ITFP is a quadrangular structure located in the anterior-inferior bony trough. The ITFP is supplied by a middle temporal artery branch and encased between the superficial and deep layers of deep temporal fascia. In 18 of 20 (90%) injections performed under ultrasound guidance, the injected product was accurately delivered to the substance of the ITFP, and in 2 of 20 (10%), the product was found immediately below the deep layer of deep temporal fascia within the temporalis muscle. In the single clinical case, saline was successfully injected in the ITFP under ultrasound guidance. CONCLUSIONS: The ITFP is a consistent anatomical structure in the anterior-inferior trough of the temporal fossa. Ultrasound technology can be utilized to identify and inject the fat pad. Further clinical evaluation will determine the role of this fat pad as a potential intermediate injection target for temple volumization procedures.

Key Anatomical Clarifications for the Marginal Mandibular Branch of the Facial Nerve: Clinical Significance for the Plastic Surgeon.

BACKGROUND: The marginal mandibular branch (MMBr) of the facial nerve is the least likely to recover from injury due to infrequent anastomosis with other branches. The MMBr has been described as coursing superior to the inferior border of the mandible. However, studies have reported variations in its location in embalmed and fresh specimens. It has been postulated that the embalming process may effect its anatomic position. OBJECTIVES: The aim of this study was to re-evalulate the location of the MMBr relative to the inferior border of the mandible in both fresh and embalmed cadavers, and investigate variation in its position with sex, side of the face, and age. METHODS: Superficial fascial planes were dissected to reveal the MMBr and its anatomic relations. Distance between the most inferior branch of the MMBr and the antegonial notch were measured bilaterally. The most inferior position of the MMBr between the antegonial notch and gonion was measured. Fresh heads were used as a comparison, with an additional measurement taken of the distance between the MMBr and the gonial angle. RESULTS: The MMBr was located inferior to the border of the mandible (90.3%) more often than above (9.6%). No significant differences were found between fresh and embalmed cadavers, sex, side of body, or age (P > 0.05). No significant difference was found between intact cadavers and fresh heads (P > 0.05). CONCLUSIONS: This study confirms and describes reliable landmarks for safety zones for the MMBr during plastic and reconstructive surgery of the lower face and upper neck. These data add reliability to studies that have investigated nerve locations in embalmed cadavers.

Anterior Approach to the Neck: Long-Term Follow-Up.

BACKGROUND: The anterior or submental necklift has been well described. Long-term results have been demonstrated in patients with minimal, mild, and moderate skin excess. It relies on the skin's unique ability to contract once separated from its attachments and further enhances the surgical result with treatment of the intermediate layer- subplatysmal fat, anterior digastric, submandibular gland, and platysma. Treatment of this layer differentiates this operation from liposuction and offers benefits beyond liposuction alone. OBJECTIVES: The authors sought to assess the long-term success of the anterior necklift for neck rejuvenation and determine its utility in patients with severe cervicomental angles. METHODS: This was a single-surgeon, retrospective review of patients who underwent an isolated anterior necklift with no additional procedures between 1998 and 2017. Pre- and postprocedure photographs were scrambled and examined by independent evaluators grading the change in cervicomental angle based on the Knize scale. The reduction in apparent age was calculated utilizing the validated apparent age assessment scale. RESULTS: Twenty-seven patients were evaluated (42% mild and 58% moderate to severe necks preoperatively). The average follow-up was 24.7 months. There was an average 3.6-year age reduction and 1.0-grade improvement in all patients. In moderate to severe necks, there was a 3.9-year age reduction and 1.4-grade improvement in the cervicomental angle following surgery. CONCLUSIONS: This study demonstrates the effectiveness of the operation in improving the cervicomental angle and reducing the overall apparent age of patients, even more so in severe cases. The operation is an option for patients who desire neck improvement but are unwilling to undergo a facelift.

External Approach to Buccal Fat Excision in Facelift: Anatomy and Technique.

BACKGROUND: Masculinization of the face is a common finding in facelift patients. It is attributed to deflation and decent of the midface-jowls coupled with skin laxity. Fullness is evident lateral to the jowl in a small percentage due to prominent buccal fat pad (BFP). OBJECTIVES: The authors sought to examine the anatomy of the BFP, triangulate the prominent BFP with surgical landmarks, and describe an external approach to excise the BFP during facelift surgery. METHODS: Eighteen cadaveric dissections were performed. Facelift flap was elevated and the prominent buccal extension of the BFP protruding through the superficial-musculo-aponeurotic-system was identified. Measurements were taken from the BFP to surgical landmarks: zygomatic arch, tragus, and gonial angle. The locations of the facial nerve, parotid duct, and vascular pedicle relative to the BFP were calculated. RESULTS: BFP was 4.1 cm inferior to the zygomatic arch, 7.5 cm anterior the tragus, and 4.5 cm medial the gonial angle. The middle facial artery supplied the BFP on the inferior-lateral quadrant in 61% and inferior-medial quadrant in 39% of specimens . In all specimens, the parotid duct traversed the BFP superiorly, and the buccal branches of the facial nerve traversed the capsule superficially. CONCLUSIONS: The buccal extension of the BFP can pseudoherniate in the aging face. Excision may improve lower facial contour. Measurements from facial landmarks may help surgeons identify the buccal extension of the BFP intraoperatively. The surgeon must be careful of the vascular pedicle, parotid duct, and the facial nerve. The external approach safely excises buccal fat during facelift dissection while avoiding intraoral incisions and unnecessary contamination.

Depth Transitions of the Frontal Branch of the Facial Nerve: Implications in SMAS rhytidectomy.

BACKGROUND: Anatomy of the frontal branch of the facial nerve relative to the zygomatic arch and the superficial musculoaponeurotic system (SMAS) has been well described. The variability centers on the location where the frontal branch traverses from a deeper to more superficial plane in the SMAS. The goal of this study is to examine the depth transition of the frontal branch of the facial nerve relative to the zygomatic arch with hopes of pinpointing a caution zone for dissection to avoid nerve injury. METHODS: The frontal branch of the facial nerve was dissected in 36 hemifacial fresh cadaver specimens. Pitanguy's line, the zygomatic arch, and temporal crest were marked. Measurements were taken from the zygomatic arch to the location where the frontal branch pierced the temporoparietal fascia. Locations of the superficial temporal artery (STA), the frontal branch cross relative to the lateral orbital rim and frontalis muscle were also measured. RESULTS: In 94.4% (n = 36) of the specimens, the frontal branch was found to transition to an intra-SMAS plane approximately 9.6 mm above the zygomatic arch. In all specimens, the frontal branch transitioned to an intra-SMAS plane approximately 12.2 mm posterior to Pitanguy's line. CONCLUSIONS: This study describes a surgical "caution zone" centered on a point 9.6 mm above the arch and 12.2 mm posterior to Pitanguy's line, and related to the anterior branch of the STA. We hope this anatomical detail will help to decrease the likelihood of intraoperative injury to the frontal branch of the facial nerve.

Neurotized Free Platysma Flap for Functional Eyelid Reconstruction: A Cadaveric Study of Anatomical Feasibility.

BACKGROUND: Conventional reconstructive options for large full-thickness eyelid defects are limited to static local flaps without replacing the missing orbicularis. The authors' aim is to delineate the platysma neurovascular anatomy for innervated functional eyelid reconstruction. METHODS: Fourteen fresh latex-injected heminecks were dissected. The locations where neurovascular structures entered the platysma muscles were expressed as the percentage distance ± SD from the sternocleidomastoid muscle mastoid insertion to manubrium origin. RESULTS: The superior thyroid, facial, and lingual vessels were the major pedicles in eight of 14 (57.1 percent), four of 14 (28.6 percent), and one of 14 specimens (7.1 percent), respectively. In one specimen (7.1 percent), both the superior thyroid and facial vessels supplied a major pedicle. Venous drainage generally mirrored arterial inflow but was redundant, with 43 percent and 14 percent of flaps also with major contributions from the external jugular and anterior jugular veins, respectively. Neurovascular pedicles entered the platysma 28 to 57 percent caudal to the sternocleidomastoid muscle mastoid insertion, between 0.5 and 4.8 cm anterior to the medial sternocleidomastoid muscle border. CONCLUSION: Although variability exists, platysma neurovascular pedicles enter at predictable locations between 28 and 57 percent of the distance from the mastoid insertion of the sternocleidomastoid muscle, therefore making free platysma transfer a feasible option for eyelid reconstruction.

Facelift Surgery Following Superficial Parotidectomy: Is it Safe?

INTRODUCTION: Patients who have previously undergone superficial parotidectomy may also seek facelift surgery for facial aging and rejuvenation. These patients present unique challenges compared to a standard facelift patient. Most concerning is the location of facial nerve branches, which may be superficial and displaced. In addition, significant contour deformities and abnormal scar patterns may be present. The purpose of the study is to review our series of patients and assess potential morbidity and safety of facelift surgery in superficial parotidectomy patients. METHODS: A retrospective case series was performed reviewing all patients who underwent facelift surgery following superficial parotidectomy from 2000 to 2017. Data were collected for: postoperative facial nerve deficit, soft tissue contour and scar deformities, facelift technique, ancillary soft tissue augmentation procedures and pre- and postoperative photographs. An evidence-based treatment algorithm to address specific problems in this patient population was developed. RESULTS: A total of seven patients were identified who underwent facelift surgery following parotidectomy. Patients underwent one of the standard SMAS procedure on the non-parotidectomy side, and surgical modifications were made to address the parotidectomy side; soft tissue augmentation was performed in two patients. Precautions to identify the facial nerve and prevent injury, including nerve monitoring and stimulation, were utilized in all seven patients. No permanent postoperative facial nerve injury was noted. CONCLUSION: Facelift following superficial parotidectomy was safely performed in all cases. Special consideration should be given to contour deformities, facial nerve location and scar placement. However, if approached properly, these patients can still be considered as suitable candidates for facelift surgery. LEVEL OF EVIDENCE IV: This journal requires that authors assign a level of evidence to each article. For a full description of these evidence-based medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266.

Facial Anatomy for Filler Injection: The Superficial Musculoaponeurotic System (SMAS) Is Not Just for Facelifting.

Facial volumization with filler and/or fat has become an integral part of global facial rejuvenation and provides a finishing touch to harmonize the face after surgical repositioning of soft tissue. However, facial injection is not devoid of complications that can lead to suboptimal outcomes. This article journeys through the facial anatomy for the injector emphasizing the superficial musculoaponeurotic system as a centralized depth gauge facilitating navigation into deep and superficial injection targets. Based on this principle, the fat compartments, ligaments, potential spaces, and neurovascular structures are categorized into planes to assist the injector in performing safe and accurate volume correction.

Retrobulbar Injection for Hyaluronic Acid Gel Filler-Induced Blindness: A Review of Efficacy and Technique.

While blindness after hyaluronic acid gel filler injection occurs only very rarely, it represents a devastating complication for the patient and the surgeon. Retrobulbar injection with hyaluronidase is the only known potential means of reversing this adverse event. However, positive outcomes remain anecdotal. We have attempted to review the current literature regarding possible efficacy and detail the indications and technique to be utilized, if hyaluronidase retrobulbar injection is to be attempted. LEVEL OF EVIDENCE V: This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .

Location of the Internal Mammary Vessels for Microvascular Autologous Breast Reconstruction: The "1-2-3 Rule".

BACKGROUND: Postmastectomy breast reconstruction provides psychosocial benefits in self-esteem, sexuality, and quality of life. Autologous procedures yield the highest overall patient satisfaction compared with implant-based breast reconstruction as the gold standard. The internal mammary vessels are the preferred recipient vessels for free flap breast reconstruction. The purpose of this study is to provide surgeons with a reliable method for locating the vessels intraoperatively. METHODS: The internal mammary vessels were dissected bilaterally on 30 cadaveric specimens. Distances from the lateral sternal borders and the costochondral junctions to the internal mammary vessels at the second, third, and fourth costal levels were recorded. Descriptive bifurcation patterns were recorded. Initial dissection practicums were performed using the proposed safer dissection zone according to quantitative data. RESULTS: Sixty internal mammary arteries and 120 internal mammary veins were studied at three costal levels, resulting in 180 sets of measurements. Distances from the lateral sternal border to the medial internal mammary vein were 6.12, 9.04, and 10.45 mm at costal levels 2, 3, and 4, respectively. Mean distances between costochondral junctions and internal mammary arteries were 12.80, 24.78, and 33.28 mm at costal levels 2, 3, and 4, respectively. Most internal mammary vein bifurcated at the third costal level, and the left side bifurcated higher than the right. Dissection practicums revealed that the proposed dissection zone was consistently reliable in locating the vessels. CONCLUSIONS: This study provides mean measurements from common bony landmarks to the internal mammary vessels, equipping surgeons with a reliable zone of dissection for recipient vessel exposure. This may decrease morbidity and improve outcomes in autologous breast reconstructions.