Class 3

Question 1

Relations & branches
1st part

Answer 1

Anterior

1-Muscles: Sterno mastoid, sternohyoid, & sterno-thyroid
2-Nerves: vagus & its cardiac branches, sympathetic branches, ansa subclavia & phrenic n. (on Lt. side only)
3-Vein; I.J.V. 4-Thoracic duct (on Lt. side)

Posterior

1-Apex of lung & cervical pleura. 2-Suprapleural membrane. 3-Recurrent laryngeal n. (on Rt. side only)
Branches

1-Vertebral a.
2-Internal thoracic a.
3-Thyrocervical trunk; divides into 3 branches: Transverse cervical a., suprascapular a. & inf
thyroid artery

Question 2

2nd part

Answer 2

Sternomastoid & scalenus ant. with Rt. phrenic n. only

As (1) & (2) of 1st part

Costocervical trunk; divides into: Deep cervical a. & sup. intercostal a

Question 3

3rd part

Answer 3

1-Skin & fascia of post. triangle
2-Clavicle
3-Subclavian v & EJV

1- Brachial plexus lower trunk
2-Upper surface 1st rib

Usually no branches. May give descending scapular a. which replaces deep branch of transverse cervical a