Thyroid Anatomy. Stephanie Johnson PGY 2 ENT. Background. What: brownish-red, highly vascular gland Location: ant neck at C5-T1, overlays 2 nd – 4 th tracheal rings Avg width: 12-15 mm (each lobe) Avg height: 50-60 mm long Avg weight: 25-30 g in adults (slightly more in women)
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PGY 2 ENT
**enlarges during menstruation and pregnancy**
Epithelial cells = 2 types:
** careful - motor nerve supply from the ansa cervicalis enters these muscles inferiorly.
SUPERIOR THYROID ARTERY:
Relationship with SLN:
**careful when ligating artery**
INFERIOR THYROID ARTERY
SCA thyrocervical trunk ITA
Relationship with RLN:
**Careful - relationship between RLN and ITA highly variable
(Redd, 1943 – described 28 variations)
**also – only 17% of the time is the nerve/artery relationship the same on both sides
**at level ITA – extralaryngeal branches RLN present 5% of the time
3 pairs of veins:
**occ – both inf veins form a common trunk “thyroid ima vein” empties into L BCV
Principally from ANS
Enter the gland along with the blood vessels.