Anatomy

Question 1

Embryology of thyroid

Answer 1

Foramen caecum , 20-24 days , endoderm
Thyroglossal duct ( from the median bud of pharynx)

Question 2

Fourth pharyngeal pouch structures

Answer 2

Superior parathyroid , ultimobrachial body . C cells reach thyroid via ubb

Question 3

Fourth pharyngeal pouch structures

Answer 3

Superior parathyroid , ultimobrachial body . C cells reach thyroid via ubb

Question 4

Weight of thyroid

Answer 4

20-24g

Question 5

Functioning unit of thyroid

Answer 5

The lobule supplied by a single arteriole and consists of 24-40 follicles lined with cuboidal epithelium

Question 6

How does subcapsular plexus of thyroid drain

Answer 6

To delphian nodes , paratracheal and nodes along superior and inferior thyroid veins ( level VI ) first . Then to II,III,IV,V&VII

Question 7

Non recurrent nerve ?

Answer 7

2 % of the rln are non recurrent and enters the tracheoesophageal groove from above

Question 8

The point at which rln is most prone for injury during surgery

Answer 8

Berry ligament ( a condensation of pretracheal fascia) , at the cricothyroid joint

Question 9

BEAHRS TRIANGLE

Answer 9

Formed by RLN , carotid artery and inferior thyroid artery
aka riddles triangle

https://drsanu.com/articles/important-triangles-in-thyroid-surgery/

Question 10

TUBERCLE OF ZUCKERLANDT

Answer 10

Most posterolateral portion of the gland , under which RLN is found

Question 11

T3 , T4

Answer 11

tri iodothyronine , L thyroxine