muscles of the neck

Question 1

Platysma

Origin

Insertion

Action

Inervation

Answer 1

O: Fascia of chest - deltoid and pectoralis

I: Mandible

A: Flex neck, depress lower jaw

Inervation: Facial Nerve

Question 2

Sternocleidomastoid

Answer 2

• Manubrium sterni and medial one-third of clavicle
• Mastoid process and lateral half of superior nuchal line
• Spinal accessory nerve; C2–C8 (sensory)
• Singly turns face toward
• opposite side; together
• fl ex head, raise thorax