Posterior Neck Triangle

Question 1

What is the origin, insertion, innervation, and function of the SCM

Answer 1

Origin: Manubrium and middle 1/3 of clavicle
Insertion: mastoid process
Innervation: Accessory nerve (CN 11)
Action: Unilateral it will flex head and neck laterally and rotate the head to the opp side
Bilaterally it will flex the lower cervical spine and extend AO joint

Question 2

What is the origin, insertion, innervation, and function splenius capitis

Answer 2

Origin: spinous process C7-T3 and ligamentum nuchae
Insertion: mastoid process
Innervation: Posterior rami C1-C6
Action: ipsilateral rotation of the head and extension and lateral flex of spine and head

Question 3

What is the origin, insertion, innervation, and function of the posterior scalene

Answer 3

Origin: posterior tubercles of transverse process of C5-C7
Insertion: lateral surface of rib 2
Innervation: Anterior Rami C6-C8
Action: Elevate 2nd rib and lateral flexion

Question 4

What is the origin, insertion, innervation, and function of the middle scalene

Answer 4

Origin: posterior tubercles of the transverse process of C2-C7
Insertion: upper surface of 1st rib
Innervation: Anterior rami C3-C8
Action: elevate Rib 1

Question 5

What is the origin, insertion, innervation, and function of the anterior scalene

Answer 5

Origin: anterior tubercles of the transverse process of C3-C6
Insertion: scalene tubercle of 1st rib
Innervation: anterior rami C4-C6
Action: elevate rib 1

Question 6

What is the origin, insertion, innervation, and function

Answer 6

Origin:
Insertion:
Innervation:
Action:

Question 7

What is the origin, insertion, innervation, and function

Answer 7

Origin:
Insertion:
Innervation:
Action: