[Auriculo temporal nerve. Neuroanatomic bases of the Frey's syndrome]. / El nervio auriculotemporal. Bases neuroanatómicas del síndrome de Frey.

The aim of this study was to precise the relationships of the auriculotemporal nerve in the infratemporal and parotid regions. We realized micro-dissections of thirty-two infratemporal and parotid regions of human cadaver's formol-fixed. The pattern of origin was: one root: 15.4%, two roots: 73.1%, three roots: 11.5%. In all cases, the lateral root present the major diameter (2-2.5 mm). In those cases with two roots, these formed a neural loop round the middle meningeal artery in the 89.4% of the cases. The origin of the medial root was the posterior border of the inferior alveolar nerve. The median distance between the lateral root and the temporomandibular joint capsule was 1.5 mm, with asymmetric pattern: right: 2 mm (rank: 0-7 mm; ED: 1.90 mm); left: 1.25 mm (rank: 0-3 mm; ED: 0.88 mm). In 10 cases (31.3%) the lateral root was in direct contact with the articular capsule, with asymmetric pattern: left: 46.1%; right: 21%. The median distance between the superior aspect of the articular disk and the trunk of the auriculotemporal nerve in the posterior aspect of the temporomandibular joint was 10,5 mm (ED: 4.06 mm), with asymmetric pattern: right: 9 mm (rank: 5-18.0 mm; ED: 3.70 mm); left: 11.0 mm (rank: 3.0-20 mm; ED: 4.41 mm). We discussed the rol of this findings in the etiology of the Frey's syndrome.

El nervio auriculotemporal. Bases neuroanatómicas del Síndrome de Frey / Auriculo temporal nerve. Neuroanatomic bases of the Frey´ Syndrome

El propósito de este estudio fue precisar las relaciones del nervio auriculo temporal en las regiones infratemporal y parotídea. Se realizó la microdisección de 32 regiones infratemporales y parotídeas de cadáveres humanos formolados. Los patrones de origen fueron: raíz única: 15.4%, dos raíces: 73.1% y tres raíces: 11.5%. En todos los casos la raíz lateral era la de mayor diámetro (2-2,5 mm). En los casos con dos raíces estas constituían un ojal nervioso a la arteria meníngea media en el 89.4% de los casos. La raíz medial se originaba en todos los casos del borde posterior del segmento inicial del nervio alveolar inferior. La distancia media entre la raíz lateral del nervio auriculotemporal y la cápsula dela articulación temporo mandibular fue de 1.5 mm, con patrón asimétrico, derecha: 2 mm (rango: 0-7 mm; DE1.90 mm); izquierda: 1.25 mm (rango: 0-3 mm; DE 0.88mm). En 10 casos (31.3%) la raíz lateral se encontraba en contacto directo con la cápsula articular, izquierda (46.1%) y a derecha (21.1%). La distancia media en la cara posterior de la articulación temporomandibular, desde la cara superior del disco articular al tronco del nervio auriculo temporal fue de 10,5 mm (DE: 4.06 mm),con patrón asimétrico, derecha: 9 mm (rango: 5,0-18,0mm; DE 3,70 mm), izquierda: 11.0 mm (rango: 3.0-20.0mm; DE 4.41 mm). Se discute el rol de estos hallazgos en la etiología del síndrome de Frey

The aim of this study was to precise the relationships of the auriculo temporal nerve in the infratemporal and parotid regions. We realized micro-dissections of thirty–two infratemporal and parotid regions of human cadaver’s form ol-fixed. The pattern of origin was: one root: 15.4%, two roots: 73.1%, three roots: 11.5%. In all cases, the lateral root present the major diameter(2-2,5 mm). In those cases with two roots, these formed a neural loop round the middle meningeal artery in the 89.4% of the cases. The origin of the medial root was the posterior border of the inferior alveolar nerve. The median distance between the lateral root and the temporo mandibular joint capsule was 1.5 mm, with a symmetric pattern: right: 2 mm (rank: 0-7 mm; ED:1.90mm); left: 1.25 mm (rank: 0-3 mm; ED: 0.88 mm).In 10 cases (31.3%) the lateral root was in direct contact with the articular capsule, with asymmetric pattern: left: 46.1%; right: 21%. The median distance between the superior aspect of the articular disk and the trunk of the auriculo temporal nerve in the posterior aspect of the temporo mandibular joint was 10,5 mm (ED: 4.06 mm), with asymmetric pattern: right: 9 mm (rank: 5-18.0 mm; ED: 3.70 mm); left: 11.0 mm (rank: 3.0-20mm; ED: 4.41 mm). We discussed the rol of this findings in the etiology of the Frey’s syndrome

[Variants of the anterior circle of Willis. Anatomic and angiografic correlation and its implications in the surgery of intracranial aneurysms. (Acigos anterior cerebral artery, median artery of the corpus callosum and accessory middle cerebral artery)]. / Variaciones del sector anterior del polígono de Willis. Correlación anatomo-angiográfica y su implicancia en la cirugía de aneurismas intracraneanos. (Arterias: ácigos cerebral anterior, mediana del cuerpo calloso y cerebral media accesoria.

It is worlwide accepted that in almost 60% of cases, anatomical variants in the Circle of Willis can be found. Some of them are associated with vascular malformations such as aneurysms. The knowledge of these anatomical variants is of vital importance when facing surgery, being the aims to preserve arteries in unusual localisations, which when injured can determine invalidating sequelae. The authors have reviewed 192 cerebral hemispheres, finding three variants in the anterior Circle of Willis: Azigos anterior cerebral artery; Median artery of the corpus callosum and accessory middle cerebral artery. The authors make an anatomical description of the findings, their angiographical correlation, and describe the influence of these changes during surgery of aneurysms in the involved regions.