Neck Muscles Week 1

Question 0

Platysma origin?

Answer 0

Fascia covering superior parts of the pectoralis major and deltoid muscles.

Question 1

Platysma insertion?

Answer 1

Inferior border of the mandible, skin, and subcutaneous tissues of the lower face.

Question 2

Platysma innervation?

Answer 2

Cervical branch of the facial nerve(CNVII)

Question 3

Platysma action?

Answer 3

Draws corners of mouth inferiorly and widens it as in expressions of sadness and fright, draws skin of the neck superiority when teeth are clenched, indicating tension.

Question 4

SCM origin?

Answer 4

Sternal head: anterior surface of the manubrium of the sternum

Clavicular head: superior surface of medial third of the clavicle

Question 5

SCM insertion?

Answer 5

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

Question 6

SMC innervation?

Answer 6

Spinal accessory nerve(CN XI), C2 and C3 nerves

Question 7

SCM actions?

Answer 7

Unilateral contraction: lateral flexion of head and rotates it so face is turned superiorly toward opposite side
Bilateral contraction: extends neck at Atlanto-occipital joints, flexes cervical vertebrae so that chin approaches manubrium, extends superior cervical vertebrae while flexing inferior vertebrae so chin is thrust forward with head kept level
With cervical vertebrae fixed, may elevate manubrium and medial end of the clavicles, assisting pump handle action of deep respiration

Question 8

Anterior scalene origin?

Answer 8

Anterior tubercles of transverse processes C3-C6

Question 9

Anterior scalene insertion?

Answer 9

1st rib

Question 10

Anterior scalene innervation?

Answer 10

Cervical spinal nerves C4-C6

Question 11

Anterior scalene?

Answer 11

Flexes neck laterally; elevates 1st rib during forced inspiration

Question 12

Middle scalene origin?

Answer 12

Posterior tubercles of transverse process of C4-C7

Question 13

Middle scalene insertion?

Answer 13

Superior surface of 1st rib; posterior to groove for subclavian artery

Question 14

Middle scalene innervation?

Answer 14

Anterior rami of cervical spinal nerves

Question 15

Middle scalene actions?

Answer 15

Flexes neck laterally; elevates 1st rib during forced inspiration

Question 16

Posterior scalene origin?

Answer 16

Posterior tubercles of transverse processes of C4-C6

Question 17

Posterior scalene insertion?

Answer 17

External border of 2nd rib

Question 18

Posterior scalene innervation?

Answer 18

Anterior rami of cervical spinal nerves C7-C8

Question 19

Posterior scalene actions?

Answer 19

Flexes neck laterally; elevates 2nd rib during forced inspiration.