A-C

A,A'

Lobes of divided thyroid

*

pretracheal gap

a

right superior thyroid artery

a'

medial branch

a''

lateral branch

b

left superior thyroid artery

b'

medial branch

b''

lateral branch

c

medial branch

c'

lateral branch of right inferior thyroid artery

d

left inferior thyroid artery

alpha

right secondary branch

beta

left secondary branch of medial branches of right inferior thyroid artery

delta

communication of superior thyroid arteries in pretracheal gap

epsilon

communicating branch between right superior and right secondary branch

epsilon'

between left superior and left secondary branch of medial branches of the right inferior thyroid arter

D

1

Os hyoideus

2

larynx

3

trachea

4

thyrohyoid muscle

A,A'

lobes of divided thyroid

a

medial lobe of right lobe of thyroid

b

suspensory ligament of medial lobe

c

accessory thyroid, left superior

*

pretracheal gap

alpha

right superior thyroid arter

beta

left superior thyroid artery

beta'

medial branch, as anomalous cricothyroid artery

beta''

lateral branch

gamma

terminal to branches of left superior thyroid artery

gamma ''

branches to left lobe and across pretracheal gap communicating with right superior thyroid artery

epsilon, epsilon'

branches of medial branches of left superior thyroid artery, which represent the cricothyroid branches

zeta

long anterior branch of right superior thyroid, which communicates with branches from left superior thyroid artery.