| ORIGINAL ARTICLE |
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| Year : 2021 | Volume
: 70
| Issue : 4 | Page : 251-254 |
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Cadaveric study on variations in the source and level of origin of superior thyroid artery
BY Shyamala1, B Akhilandeswari2
1 Department of Anatomy, ESIC PGIMSR Bangalore, Bengaluru, Karnataka, India
2 Department of Anatomy, Bangalore Medical College and Research Institute, Bengaluru, Karnataka, India, India
Correspondence Address:
Dr. B Y Shyamala
House No 1670, BDA Houses, Austin town, Bengaluru - 560 047, Karnataka
India
 Source of Support: None, Conflict of Interest: None
DOI: 10.4103/JASI.JASI_231_19
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Introduction: Superior thyroid artery (STA) is one of the branches of the external carotid artery (ECA) which supplies the upper larynx, neck, and thyroid gland. The anatomic features of this artery and its relation to neighboring bony landmarks are important in surgical approaches. The primary objective is to find the source of origin of STA. Secondary objective is to find the level of origin of STA with reference to the origin of ECA and midpoint of the upper border of the thyroid cartilage. Material and Methods: The present study was carried out on 60 hemi necks obtained from human adult cadavers from Anatomy Department, Bangalore Medical College, Bangalore, Karnataka. The dissection was carried out according to instructions of Cunningham's practical manual. The origin and branching pattern of the STA were noted and measured. Results: The STA arose from the common carotid artery in 5% (3) cases and from the ECA in 95% (57). Among the 95% cases, 46.7% (28) arose at the origin of ECA, and in 1.7% (1) case, STA arose as a common trunk with lingual and facial arteries. The mean distance between the point of origin of STA and the point of origin of ECA is 5.4 ± 5.3 mm. The mean distance between the point of origin of STA and superior border of thyroid cartilage is 40 ± 7.6 mm. Discussion and Conclusion: The origin of STA from carotid bifurcation ranged from 1 to 25 mm. Most studies show equal incidence of origin of STA from ECA and carotid bifurcations.
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