Posterior Triangle Muscles

Question 1

Splenius cervicus, capitis

Answer 1

just below trapezius
A: head extends, rotates, bends laterally

O- Spinous processes and ligaments connecting inferior cervical and superior thoracic vertebrae
I-mastoid process, occipital bone, superior cervical vertebrae

A-together-extend
alone-flex neck to side (lateral)
I- cervical spinal nerves

Question 2

Levator scapulae

Answer 2

inferior to splenius cervicus
skull to spine of scapula
elevates scapula

O- transverse processes 1st 4 vertebrae (cervical)
I- vertebral border of scapula near superior angle
A- elevates scapula
I- C3,C4, C5 (dorsal scapular nerve)

Question 3

Anteromedial to LS= Scalene muscles

Answer 3

between ant and middle scalenes: trunks of brachial plexus and DISTAL SUBCLAVIAN ARTERY WHICH BECOMES AXILLARY ARTERY JUST BELOW CLAVICLE TO UPPER ARM

Between ant scalene and scm muscle: internal jug vein

Question 4

Borders:

Answer 4

ant: post border scm
post: ant border trapezius
inferior: mid 1/3 clavicle

Question 5

Ant, mid, post scalenes

Answer 5

O- Transverse and costal processes of cervical vertebrae
I- superior surface 1st 2 ribs
A- elevates ribs/ flex neck
I- cervical spinal nerves

Question 6

Vasculature

Answer 6

Vein: ext jug. vein

Veins and arteries: subclavian, transverse cervical, suprascapular

Question 7

Innervation

Answer 7

Brachial plexus
CN 11 Accessory nerve
Phrenic nerve (C3,4,5)