Muscles of the neck

Question 1

Platysma

Answer 1

OI - Fascia of overlying pectoralis major and deltoid muscles
Inferior border of the mandible and the skin of the lower face
Action - Draws the corners of the mouth down, aids in depression of the mandible
Innervation - cervical branch of the facial nerve
Artery - Facial

Question 2

SCM

Answer 2

OI - Sternal head, anterior surface of manubrium, Clavicular head, medial 1/3 of clavicle
Mastoid process and lateral 1/3 of superior nuchal line
Action - Draws the mastoid down toward the same side, which causes the chin to turn up toward the opposite side
Acting together bilateral SCM flexes the neck
Innervation - Accessory nerve, sensory supply C2 and C3
Artery - SCM branch of occipital artery

Question 3

Levator Scapulae

Answer 3

OI - TVPs C1-C4
Medial border of scapula from the superior angle to the spine
Action - Elevates scapula
Innervation -Dorsal scapular nerve C5, upper part receives branches of C3 and C4
Artery - transverse cervical, ascending cervical, vertebral arteries

Question 4

Longus Capitis

Answer 4

OI - Anterior tubercles of C3-C6
Basilar portion of occipital bone
Action - Flex the head and neck
Innervation - Cervical plexus, and ventral rami of C1-C4 spinal nerves
Artery - Deep cervical artery

Question 5

Longus Colli

Answer 5

OI - Anterior tubercles and anterior surfaces of the bodies of C3-T3
Anterior arch of atlas, anterior tubercles of C1-6
Action - Flexes neck, rotates and laterally bends neck
Innervation - Cervical and brachial plexus C2-C7
Artery - Deep cervical artery

Question 6

Rectus capitis anterior

Answer 6

OI - Lateral mass of atlas
Basilar portion of occipital bone
Action - Flexes the head
Innervation -Ventral ramus of C1
Artery - Deep cervical artery

Question 7

Rectus capitis lateralis

Answer 7

OI - TVP of atlas
Occipital bone anterolateral to foramen magnum
Action - Laterally bends the head
Innervation - Ventral ramus of C1
Artery - Deep cervical artery

Question 8

Anterior Scalene

Answer 8

OI - TVPs C3-C6
Scalene tubercle of the 1st rib
Action - Elevates 1st rib
flexes and laterally bends neck
Innervation - Brachial plexus C5-C7
Artery - Ascending cervical artery (branch of thyrocervical trunk)

Question 9

Middle Scalene

Answer 9

OI - TVPs C2-C7
Upper surface of 1st rib behind subclavian artery
Action - Elevates 1st rib
flexes and laterally bends neck
Innervation - Brachial plexus C3-C8
Artery - Ascending cervical artery

Question 10

Posterior Scalene

Answer 10

OI - TVPs C5-C7
Lateral surface of 2nd rib
Action - Elevates 2nd rib
flexes and laterally bends neck
Innervation - Brachial plexus C7-C8
Artery - Ascending cervical ARTERY