Neck POINAS

Question 1

Sternocleidomastoid (Purposeful Activities)

Answer 1

Watching an athletic event, socializing, driving

Question 2

Sternocleidomastoid (Main Actions)

Answer 2

Unilateral contraction: tilts head to same side (i.e. laterally flexes neck) and rotates it so face is turned superiorly toward opposite side (contralateral rotation)

Bilateral contraction: extends neck at atlanto-occipital joints, flexes cervical vertebrae so chin approches manubrium, or extends superior cervical verebrae while fleixing inferior vertebrae so chin is thrust forward with head kept level

With cervical vertebrae fixed, may elevate manubrium and medial ends of clavicles, assisting pump-handle action of deep respiration

MAIN MUSCLE FOR ROTATING CERVICAL SPINE

Question 3

Sternocleidomastoid (Superior Medial Attachments)

Answer 3

• Mastoid process of temporal bone
• Lateral half of superior nuchal line

Question 4

Sternocleidomastoid (Inferior Lateral Attachments)

Answer 4

Sternal head: manubrium of sternum
Clavicular head: medial third of clavicle

Question 5

Sternocleidomastoid (Nerve Innervation)

Answer 5

Cranial Nerve XI / Spinal Accesory Nerve (motor), C3 and C4 (pain and proprioception)

Question 6

Platysma (Puposeful Activities)

Answer 6

Facial Expression

Question 7

Platysma (Main Actions)

Answer 7

• Draws corners of mouth inferiorly and widens it as in expressions of sadness and fright
• Draws skin of neck superiorly when teeth are clenched

Question 8

Platysma (Superior Medial Attachment)

Answer 8

• Inferior border of mandible, skin, and subcutaneous tissues of lower face

Question 9

Platysma (Inferior Lateral Attachment)

Answer 9

Pectoralis major and deltoid muscles

Question 10

Platysma (Nerve Innervation)

Answer 10

Cranial Nerve VII (Facial Nerve)