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The great auricular nerve in fetuses / El nervio auricular mayor en fetos
Pillay, Pathmavathie; Partab, Prawesh; Lazarus, Lelika; Satyapal, Kapil S.
  • Pillay, Pathmavathie; University of KwaZulu-Natal. Faculty of Health Sciences. Department of Clinical Anatomy. Durban. ZA
  • Partab, Prawesh; University of KwaZulu-Natal. Faculty of Health Sciences. Department of Clinical Anatomy. Durban. ZA
  • Lazarus, Lelika; University of KwaZulu-Natal. Faculty of Health Sciences. Department of Clinical Anatomy. Durban. ZA
  • Satyapal, Kapil S; University of KwaZulu-Natal. Faculty of Health Sciences. Department of Clinical Anatomy. Durban. ZA
Int. j. morphol ; 30(1): 40-44, mar. 2012. ilus
Article in English | LILACS | ID: lil-638756
Responsible library: CL1.1
ABSTRACT
The great auricular nerve (GAN) is the largest branch of the superficial cervical plexus that winds around the posterior border of the sternocleidomastoid muscle, accompanied by the external jugular vein. Forty fetuses (right side 40/80; left 40/80) with gestational ages between 15 to 28 weeks were microdissected to document the anatomy of the GAN. The results obtained were classified as i) Incidence and morphometry GAN was present in 100 percent of the fetal specimens with average length on the right and left sides recorded as 12.65 +/- 2.14 mm and 12.55 +/- 2.82 mm respectively. ii) Course GAN was located parallel to the transverse cervical nerve and the external jugular vein. Duplicate external jugular veins were observed in 5 percent (4/80) with GAN located anterior to one of the tributaries; iii) Branching Pattern 16 percent (13/80) of specimens depicted a single branch. Duplicate branches in 67 percent (54/80) (referred to as Type I anterior and posterior branches and 33 percent (26/80) referred to as Type II anterior and posterior branches; iv) Variation the transverse cervical nerve formed a communication with GAN, inferior to the parotid gland in 1 percent. The anatomical knowledge of the course, bifurcation pattern and variations of GAN may prevent complications during surgical procedures such as parotidectomies.
RESUMEN
El nervio auricular mayor (NAM) es el ramo más grande del plexo cervical superficial que gira alrededor del margen posterior del músculo esternocleidomastoideo, acompañado de la vena yugular externa. Cuarenta fetos (lado derecho 40/80; izquierdo 40/80), con edades gestacionales de 15 a 28 semanas fueron microdisecados para describir la anatomía del NAM. Los resultados obtenidos se clasificaron en i) Incidencia y morfometría NAM estaba presente en el 100 por ciento de las muestras fetales con una longitud media de los lados derecho e izquierdo de 12,65+/-2,14mm y 12,55+/-2,82mm, respectivamente. ii) Curso NAM se encuentra paralelo al nervio cervical transverso y la vena yugular externa. Duplicación de las venas yugulares externas se observaron en el 5 por ciento (4/80) con el NAM situado por delante de uno de los afluentes, iii) Patrón de ramificación 16 por ciento (13/80) de las muestras presentaba una solo ramo. Ramos duplicados en el 67 por ciento (54/80) de Tipo I, ramos anterior y posterior y, el 33 por ciento (26/80) Tipo II, ramos anterior y posterior, y iv) Variación el nervio cervical transverso formando una comunicación con NAM, inferior a la glándula parótida en el 1 por ciento. El conocimiento anatómico del curso, patrón de bifurcación y variaciones del NAM pueden prevenir las complicaciones durante los procedimientos quirúrgicos como la parotidectomía.
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Full text: Available Index: LILACS (Americas) Main subject: Fetus Limits: Humans Language: English Journal: Int. j. morphol Journal subject: Anatomy Year: 2012 Type: Article Affiliation country: South Africa Institution/Affiliation country: University of KwaZulu-Natal/ZA

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Full text: Available Index: LILACS (Americas) Main subject: Fetus Limits: Humans Language: English Journal: Int. j. morphol Journal subject: Anatomy Year: 2012 Type: Article Affiliation country: South Africa Institution/Affiliation country: University of KwaZulu-Natal/ZA