38. Posterior triangle of the neck

Question 1

Anterior border of posterior triangle?

Answer 1

Posterior border of SCM

Question 2

Posterior border of posterior triangle?

Answer 2

Anterior border of trapezius

Question 3

Base of posterior triangle?

Answer 3

Clavicle

Question 4

Name the:
Vein
Nerves
Lymph nodes 
In the posterior triangle?

Answer 4

EJV

Brachial plexus roots
Accessory nerve

Cervical lymph nodes
Supraclavicular lymph nodes

Question 5

*Make sure you know the cutaneous innervation of the head and neck**

Answer 5

Slide 7

Question 6

Which muscles in the posterior triangle does the phrenic nerve cross?

Answer 6

Anterior scalene

Question 7

In the posterior triangle, between which 2 muscles do the roots of the brachial plexus pass?

Answer 7

Middle scalene

Anterior scalene

Question 8

Innervation of SCM?

Answer 8

Motor - spinal accessory CN XII

Pain and proprioception - C2, C3

Question 9

Actions of trapezius?

Answer 9

Ascending part - depress scapula
Transverse - retract scapula
Descending - elevate scapula, rotate glenoid cavity

Question 10

Innervation of trapezius?

Answer 10

Spinal accessory CNXI

C2, C3

Question 11

Which 2 muscles form the floor of the posterior triangle of the neck?

Answer 11

Omohyoid

Splenius capitis

Question 12

Action of omohyoid?

Answer 12

Depress hyoid

Question 13

Innervation of omohyoid?

Answer 13

Ansa cervicalis

Question 14

Action of splenius capitis?

Answer 14

Extend and rotate neck

Question 15

Innervation of splenius capitis?

Answer 15

Dorsal rami middle cervical

Question 16

Origin of levator scapulae?

Answer 16

Transverse processes of atlas, axis, 3rd, 4th vertebrae

Question 17

Insertion of levator scapulae?

Answer 17

Medial scapular border between superior angle and medial end of scapular spine

Question 18

Action of levator scapulae?

Answer 18

Control scapular position

Elevate shoulder

Question 19

Innervation of levator scapulae?

Answer 19

C3, C4, C5 via dorsal scapular nerve

Question 20

Origins of the scalenes?

Answer 20

Transverse processes of:

C3 - C6 (ant)
C2 - C7 (middle)
C4 - C6 (post)

Question 21

Insertion of scalenes?

Answer 21

Ribs 1 and 2

Question 22

Innervation of scalenes?

Answer 22

Middle - anterior rami C3 - 7

Anterior - C4-7

Posterior - C5 - 7

Question 23

Action of scalenes?

Answer 23

Flex neck
Tilt head to same side
Elevate upper ribs