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Flashcards in Posterior Neck Muscles Deck (32)
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1

Sternocleidomastoid (SCM) Sternal Head Origin

Lateral surface of mastoid process of temporal bone and lateral half of superior nuchal line

2

Sternocleidomastoid (SCM) Sternal Head Insertion

Anterior surface of manubrium of sternum

3

Sternocleidomastoid (SCM) Sternal Head Innervation

Spinal accessory nerve (CN XI, motor); C2 and C3 nerves (pain and proprioception)

4

Sternocleidomastoid (SCM) Sternal Head Unilateral Action

Tilts head to same side (i.e., laterally flexes neck) and rotates it so face is turned superiorly toward opposite side

5

Sternocleidomastoid (SCM) Sternal Head Bilateral Contraction Action

(1) Extends neck at atlanto-occipital joints (2) flexes cervical vertebrae so that chin approaches manubrium or (3)

6

Trapezius Superior Fibers Origin

Medial third of superior nuchal line, external occipital protuberance, nuchal ligament, spinous processes of C7-T12 vertebrae, and lumbar and sacral spinous processes

7

Trapezius Superior Fibers Insertion

Lateral third of clavicle, acromion, and spine of scapula

8

Trapezius Superior Fibers Innervation

Spinal Accessory nerve(CN XI; motor); C2 and C3 nerves (pain and proprioception)

9

Trapezius Superior Fibers Action

Elevates, retracts, and rotates scapula superiorly. Descending (superior)fibers: elevate pectoral girdle, maintain level of shoulders against gravity or resistance

10

Splenius Capitis Origin

Inferior half of nuchal ligament and spinous processes of superior six thoracic vertebrae

11

Splenius Capitis Insertion

Lateral aspect of mastoid process and lateral third of superior nuchal line

12

Splenius Capitis Innervation

Posterior rami of middle cervical spinal nerves

13

Splenius Capitis Action

Laterally flexes and rotates head and neck to same side; acting bi-laterally extends head and neck

14

Levator Scapulae Origin

Posterior tubercles of transverse processes C2-C6 vertebrae

15

Levator Scapulae Insertion

Superior part of medial border of scapula

16

Levator Scapulae Innervation

Dorsal scapular nerve C5 and cervical spinal nerves C3 and C4

17

Levator Scapulae Action

Downward rotation of scaula and tilts its glenoid cavity inferiorly by rotating scapula

18

Anterior Scalene Origin

Transverse processes of C3-C6 vertebrae

19

Anterior Scalene Insertion

1st rib

20

Anterior Scalene Innervation

Cervical spinal nerves C4-C6

21

Anterior Scalene Action

Flex head

22

Anterior Scalene Root

C4-C6

23

Middle Scalene Origin

Posterior tubercles of transverse processes of C5-C7 vertebrae

24

Middle Scalene Insertion

Superior surface of 1st rib; posterior to groove for sub-clavian artery

25

Middle Scalene Innervation

Anterior rami of cervical spinal nerves

26

Middle Scalene Action

Flexes neck laterally; elevates 1st rib during forced inspiration

27

Middle Scalene Root

C7,C8

28

Posterior Scalene Origin

Posterior tubercles of transverse processes of C5-C7 vertebrae

29

Posterior Scalene Insertion

External border of 2nd rib

30

Posterior Scalene Innervation

Anterior rami of cervical spinal nerves C7 and C8