Posterior Trinagle Of The Neck

Question 1

Platysma

Answer 1

From fascia above pectoralis major and clavicle to lateral neck and onto mandible
Facial nerve

Question 2

Sternocleidomastoid SCM

Answer 2

Spinal accessory nerve

Question 3

Trapezius

Answer 3

Spinal accessory nerve, cervical plexus C3,4

Question 4

Floor of posterior triangle

Answer 4

Omohyoid- depresses hyoid bone

Splenius capitis- extends the neck, rotate dorsal rami

Question 5

Levator scapulae

Answer 5

Transverse process of atlas and axis, 3rd and 4th cervical vertebrae to medial scapular border between superior angle and medial end of scapular spine
Help control scapular position, elevate shoulder, shoulder fixed can laterally flex neck to the same side
C3,4,5 via dorsal scapular nerve

Question 6

Scalenes

Answer 6

From transverse process of C3-6 anterior, C2-7 middle, C4-6 Posterior
To rib 1
Flexes neck. Tilts head to same side and elevates upper ribs