Back of the Neck Muscles (O, I, A, Ns)

Question 1

Origin: Trapezius (Posterior)

Answer 1

Occipital protuberance, nuchal ligament and spinous processes of C7-T12

Question 2

Insertion: Trapezius (Posterior)

Answer 2

Clavicle, acromion process, and scapular spine

Question 3

Action: Trapezius (Posterior)

Answer 3

Extends and laterally flexes head and neck

Question 4

N. Innervation: Trapezius (Posterior)

Answer 4

Accessory

Question 5

Origin: Semispinalis Capitis

Answer 5

Transverse processes of C7 to T7, the articular processes of C4 to C6

Question 6

Insertion: Semispinalis Capitis

Answer 6

Medial part of the area between the superior and inferior nuchal lines of the occipital bone

Question 7

Action: Semispinalis Capitis

Answer 7

Bilaterally: Extends and hyperextends head and neck
Unilaterally: Rotates head and neck to opposite side

Question 8

N. Innervation: Semispinalis Capitis

Answer 8

Dorsal rami of middle and lower cervical nerves

Question 9

Origin: Splenius Capitis

Answer 9

(C4-T6) Inferior half of nuchal ligament and spinous processes of superior six thoracic vertebrae

Question 10

Insertion: Splenius Capitis

Answer 10

Superior nuchal line and mastoid process

Question 11

Action: Splenius Capitis

Answer 11

Laterally flexes and rotates head and neck to same side

Acting bilaterally; extends head and neck

Question 12

N. Innervation: Splenius Capitis

Answer 12

Posterior rami of cervical nerves

Question 13

Origin: Splenius Cervicis

Answer 13

Spinous process of T3-T6

Question 14

Insertion: Splenius Cervicis

Answer 14

Posterior tubercles of transverse process of C1-C3

Question 15

Action: Splenius Cervicis

Answer 15

Rotates and extends neck

Question 16

N. Innervation: Splenius Cervicis

Answer 16

Dorsal rami of cervical nerves

Question 17

Origin: Levator Scapulae

Answer 17

Posterior tubercles of transverse processes of C1-C4

Question 18

Insertion: Levator Scapulae

Answer 18

Superior angle of scapula

Question 19

Action: Levator Scapulae

Answer 19

Laterally flexes neck; elevates, retracts, and rotates scapula

Question 20

N. Innervation: Levator Scapulae

Answer 20

Dorsal scapular nerve C5 and cervical spinal nerves C3 and C4

Question 21

Origin: Anterior Scalene

Answer 21

Transverse processes of C3-C6 vertebrae

Question 22

Insertion: Anterior Scalene

Answer 22

1st rib

Question 23

Action: Anterior Scalene

Answer 23

Flex head

Question 24

N. Innervation: Anterior Scalene

Answer 24

Anterior primary rami of C5, 6

Question 25

Origin: Middle Scalene

Answer 25

C2 to C7 (Posterior tubercles of the transverse processes of cervical vertebrae 2 to 7)

Question 26

Insertion: Middle Scalene

Answer 26

1st rib

Question 27

Action: Middle Scalene

Answer 27

Elevates first rib

Flexes neck laterally

Question 28

N. Innervation: Middle Scalene

Answer 28

Anterior rami of cervical spinal nerves

Question 29

Origin: Posterior Scalene

Answer 29

Posterior tubercles of transverse processes C5-C7

Question 30

Insertion: Posterior Scalene

Answer 30

2nd rib

Question 31

Action: Posterior Scalene

Answer 31

Elevation of the 2nd rib

Question 32

N. Innervation: Posterior Scalene

Answer 32

Anterior rami of cervical spinal nerves C7-C8