Type of Article : Original Research
Year: 2015 | Volume 3 | Issue 2 | Page No. 1152-1155
Date of Publication: 30-06-2015
A STUDY OF FORAMINA THYROIDEUM
Sharada B.Menasinkai *1, Savitha V 2.
2 Post graduate.
Department of Anatomy, Mysore Medical College & Research Institute, Mysore, Karnataka, India.
Address: Dr. Sharada B.Menasinkai, Associate Professor, Dept. of Anatomy, Mysore Medical College & Research Institute, Mysore, Karnataka, India. Mobile: +919945614794
Background: A foramen in the lamina of thyroid cartilage is an occasional opening existing in one or both thyroid laminae which may or may not contain a neurovascular component. Foramen was first described by Segond in 1847.
Materials and methods: Larynx specimens were collected from Department of Forensic Medicine Mysore Medical College. 62 Larynx specimens were collected, 31 male and 31 female, and fixed in 10% formalin solution for 2-3 weeks. Careful dissection was done to separate thyroid cartilage and following observations were made. Location of foramen, regarding the side of lamina and its relation to oblique line was noted. Size, shape and measurements were noted.
Results: Foramina were observed in the laminae of 9 thyroid cartilages in females and 6 in male specimens. 1 male specimen showed bilateral foramina thyroideum. Among 16 Foramina Thyroideum (FT), 13 were on right lamina and 3 on left lamina. Shape of FT was round in 9 specimens and oval in 7 specimens. 10 FT were located in front of oblique line, 5 were behind and 1 was on the line. Size of FT range from 1mm - 5.67mm, close to upper boarder in 13 specimens and 3 were in the middle.1 specimen showed presence of superior laryngeal vessels in FT.
Conclusions: Incidence of FT in the present study was 25.8%.To conclude presence of FT being a rare variation clinicians need to be aware of the possible contents such as external and internal laryngeal nerve communication and presence of superior laryngeal vessels before undertaking surgical procedures.
KEY WORDS: Thyroid cartilage, foramen thyroideum (FT), internal laryngeal vessels. internal laryngeal nerve.
- L. Ramsaroop, K.Hurrinarain, P.Partab & K.S.Satyapal. The Incidence of the Foramen Thyroideum in the South African Population. Int.J.Morphology 2010;28(2):433-438.
- Bergman R.A.,Thompson S.A., Afifi A.K. Saadeh F.A. Compodeum of Human Anatomic Variation. Catalog. Atlas and World literature.Organs: respiratory system.Urban & Schwarzenberg IBaltimore: 1988;page 167.
- Symington J.Splanchnology. In: Editors Longmans, Green, and co 39 Paternoster Row, London ,Quains Elements of Anatomy 11th edition, vol II, part II; page 154.
- Roberto Bastos Silva, Marcus Vinicius Fernandes Dias, Rodrigo Motto Pacheco Fernandes, Marcio Antonio Babinski. A Unilateral anomaly of the superior laryngeal artery passing through the thyroid cartilage lamina. Braz.J. Morphol.Sci. 2005; 22(1),41-42.
Sharada B.Menasinkai, Savitha V. A STUDY OF FORAMINA THYROIDEUM. Int J Anat Res 2015;3(2):1152-1155. DOI: 10.16965/ijar.2015.184