Posterior Triangle of the Neck

Question 1

Fascia of the Posterior Triangle of the Neck

Answer 1

Question 2

Platysma

Attachments

Answer 2

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

Question 3

Platysma

Innervation

Answer 3

Facial nerve (CN VII)

Question 4

Borders of the Posterior Triangle of the Neck

Answer 4

Question 5

Nerves and Vasculature

Answer 5

Question 6

Nerves and Vasculature of the Posterior Triangle of the Neck

Answer 6

Question 7

Nerves of the Posterior Triangle of the Neck

Answer 7

Question 8

Cutaneous Nervous Supply to Head and Neck

Answer 8

Question 9

Veins

Answer 9

External jugular to SCM

Internal jugular posterior to SCM

Anterior jugular midline (may be absent)

Question 10

Neck Structures

Answer 10

Question 11

Neck Structures

Answer 11

Question 12

Neck Structures

Answer 12

Question 13

Sternocleidomastoid (SCM)

Innervation

Answer 13

Motor - Spinal accessory (CN XI)

Pain and Proprioception - Cervical plexus (C2, C3)

Question 14

Movements of SCM

Answer 14

Question 15

Trapezius

Function

Answer 15

A - Ascending part depresses scapula

B - Transverse part retracts scapula

C - Descending part elevates scapula and rotates glenoid cavity

Question 16

Trapezius

Innervation

Answer 16

Spinal accessory nerve (CN XI)

Cervical plexus (C3, C4) (Proprioception)

Question 17

Floor of the Posterior Triangle of the Neck

Omohyoid

Answer 17

Depresses hyoid bone (ansa cervicalis)

Question 18

Floor of the Posterior Triangle of the Neck

Splenius capitis

Answer 18

Extend the neck, rotate (dorsal rami middle cervical)

Question 19

Levator Scapulae

Attachments

Answer 19

Transverse processes of atlas and axis, 3rd and 4th C vertebrae to medial scapular border between superior angle and medial end of scapular spine

Question 20

Levator Scapulae

Function

Answer 20

Help control scapular position, elevate shoulder, and can laterally flex neck to the same side when the shoulder is fixed

Question 21

Levator Scapulae

Innervation

Answer 21

Direct C3, 4 and C5 via dorsal scapular nerve

Question 22

Scalenes

Attachments

Answer 22

From transverse processes of C3-6 (anterior)

C2-7 (middle)

C4-6 (posterior)

To ribs 1 (scalene tubercle - anterior, and behind subclavian artery groove - middle) and 2 posterior

Question 23

Scalenes

Function

Answer 23

Flex neck (bilateral), tild head to same side (unilateral) and elevate upper ribs

Question 24

Scalenes

Innervation

Answer 24

Middle scalene (anterior rami C3-7)

Anterior scalene (anterior rami C4-7)

Posterior scalene (anterior rami C5-7)