Upper border of thyroid cailage is at
The thyroid gland lies against veebrae C5, C6, C7 and T1 embracing the upper pa of the trachea Each lobe extends from the middle of cailage to the fouh or fifth tracheal ring The isthmus extends from second to the fouh tracheal ring Ref BDC volume3,6th edition pg 140
C2
C5
C6
T1
Head and neck