Cutaneous and Superficial Muscles of Neck

Question 0

Sternocleidomastoid

Origin

Answer 0

Sternal head: anterior surface of manubrium of sternum

Clavicular head: superior surface of medial third of clavicle

Question 1

Sternocleidomastoid

Insertion

Answer 1

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

Question 2

Sternocleidomastoid

Innervation

Answer 2

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

Question 3

Sternocleidomastoid

Actions

Answer 3

Draws corners of mouth inferior and widens it as in expressions of sadness and fright; draws skin of neck superior when teeth are clenched, indicating tension

Question 8

Roof of Lateral

Answer 8

Investing layer of deep cervical fascia, platysma

Question 9

Inferior Border of Lateral

Answer 9

Clavicle (between SCM and trapezius)

Question 10

Superior Border of LAteral

Answer 10

Merging of SCM and trapezius

Question 11

Posterior Border of Lateral

Answer 11

Anterior border of trapezius

Question 12

Anterior Border of Lateral

Answer 12

Posterior border of SCM

Question 13

Sternocleidomastoid Region

Answer 13

SCM, superior part of EJC, greater auricular nerve, transverse cervical nerve, inferior part of IJV

Question 14

Posterior Cervical Region

Answer 14

Descending part of trapezius muscle; cutaneous branches of posterior rami of cervical spinal nerves; suboccipital region lies deep to superior part of this region

Question 15

Lateral Cervical Region (posterior triangle of neck)

Answer 15

Part of EJV, posterior branches of cervical plexus of nerves, spinal accessory nerve, trunks of brachial plexus, cervicodorsal trunk, cervical lymph nodes

Question 16

Floor of Lateral Cervical Region

Answer 16

Splenius capitis, levator scapulae, middle scalene, posterior scalene