Thryocervical Trunk

Question 1

Thyrocervical trunk

Answer 1

Short trunk from 1st part subclavian artery close to scalenus anterior medial margin

Question 2

Branches

Answer 2

1. Inferior thyroid artery
2. Suprascapular artery
3. Transverse cervical artery

Question 3

Inferior thyroid artery course

Answer 3

1. Ascends along scalenus anterior medial border till C6 transverse process
2. Curves medial in front of vertebral artery behind carotid sheath
3. Reach thyroid gland posterior surface
4. Finally, descends reaching gland inferior pole (closely related to recurrent laryngeal nerve which supplies all larynx muscles except circothyroid and larynx mucosa below vocal cords)

Question 4

Inferior thyroid artery branches

Answer 4

1. Ascending cervical artery
2. Inferior laryngeal artery
3. Tracheal and esophageal arteries
4. Glandular branches

Question 5

Ascending cervical artery

Answer 5

In front of scalenus anterior

Question 6

Glandular branches

Answer 6

Supply lower 2/3 of lobe (including base), lower 1/2 isthmus and parathyroids

Question 7

Suprascapular artery course and anastomosis

Answer 7

1. Passes lateral in front of scalenus anterior
2. Crosses posterior triangle lower part close to clavicle
3. Share in anastomosis around scapula

Question 8

Transverse cervical artery

Answer 8

1. Passes lateral in front scalenus anterior above Suprascapular artery
2. Transverses posterior triangle
3. Divides into 2 branches in relation to Levator scapulae:
   - superficial branch
   - deep branch

Question 9

Transverse cervical artery superficial branch

Answer 9

Supplies trapezius deep surface

Question 10

Transverse cervical artery deep branch

Answer 10

Descends along scapula medial border sharing in anastomosis around scapula