Variations of the External and Internal Jugular Veins: A Fetal Study
SUMMARY: The external jugular vein (EJV) is formed by the union of the posterior division of the retromandibular vein and posterior auricular vein, while the internal jugular vein (IJV) is a continuation of the sigmoid sinus. A number of variations in the formation, lengths and drainage patterns of...
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| Autores principales: | , , |
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| Lenguaje: | English |
| Publicado: |
Sociedad Chilena de Anatomía
2018
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| Materias: | |
| Acceso en línea: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022018000100145 |
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| Sumario: | SUMMARY: The external jugular vein (EJV) is formed by the union of the posterior division of the retromandibular vein and posterior auricular vein, while the internal jugular vein (IJV) is a continuation of the sigmoid sinus. A number of variations in the formation, lengths and drainage patterns of EJV and IJV have been documented in adults, however there is a paucity of literature regarding fetal studies. This study aimed to highlight variation patterns of external and internal jugular veins in 40 fetuses (n=80). This study included the bilaterally dissection of the neck region in 40 fetuses between the gestational ages of 15-28 weeks at the University of KwaZulu-Natal as per Grants Dissector. This study observed three variations in the pattern of the EJV and IJV. With regard to the EJV, duplication occurred on the sternocleidomastoid muscle in 4 % of the specimens sampled in this study, which concurred to a study conducted by Olabu et al. (2015) in a Kenyan sample. The “Y-shaped” IJV occurred in 1 % of the specimens, however the “Y-shaped” IJV gave off a tributary to the EJV in 3 % of the specimens sampled in this study. Lalwani et al. (2006) stated a rare venous communication between the EJV and IJV. The knowledge of the variable patterns of the external and internal jugular veins are important to clinicians performing micro-vascular surgeries in head and neck region. |
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