Thyroid

Question 1

nerve supply to platysma

Answer 1

CNVII (muscle of facial expression)

Question 2

Describe the descent of thyroid embryologically

Answer 2

back of tongue through foramen caecum and via the thyroglossal duct down to position

Question 3

is the thyroid cartilage open or closed

Answer 3

open

Question 4

Where do the thyroid arteries come off?

Answer 4

Right after common carotid artery splits, the external carotid gives off superior thyroid
Inferior thyroid is branch of subclavian

Question 5

Where do the thyroid veins drain into?

Answer 5

Superior and middle drain into internal jugular

BOTH inferiors drain into LEFT brachiocephalic vein

Question 6

Contents of carotid sheath

Answer 6

internal jugular vein
common/internal carotid arteries
vagus nerve
deep cervical lymph nodes

Question 7

what connects the two lobes

Answer 7

isthmus

Question 8

Name of anterior muscle of neck

Answer 8

Platysma

Question 9

Blood supply to thyroid

Answer 9

Superior and inferior thyroid arteries

Sometimes a middle thyroid ima artery

Question 10

Lymph nodes of thyroid

Answer 10

Deep superior
Inferior
Tracheal: paratracheal and pretracheal

Question 11

Lymph drainage

Answer 11

On RHS lymph drains into the right lymphatic duct and into the right angle. This is only 1/4th of the body.
On the LHS lymph drains via the thoracic duct to the left venous angle. This is 3/4th of the body.

Question 12

Name the strap muscles

Answer 12

Omohyoid
Sternothyroid
Thyrohyoid 
Sternohyoid 
('hyoid' is never at the beginning)

Question 13

Venous drainage of Thyroid

Answer 13

Superior, middle and inferior thyroid veins

Question 14

is the cricoid carriage open or closed

Answer 14

closed in a complete ring