Cutaneous and Superficial Muscles of the Neck

Question 1

Platysma Origin

Answer 1

Inferior border of mandible, skin, and subcutaneous tissue of lower face.

Question 2

Platysma Insertion

Answer 2

Fascia covering superior parts of pectoralis major and deltoid muscles.

Question 3

Platysma Innervation

Answer 3

Cervical Branch of Facial Nerve

Question 4

Platysma Action

Answer 4

Corners of mouth inferiorly, teeth clenched, tension.

Question 5

Sternoclavicular Origin

Answer 5

Mastoid Process, lateral half of superior nuchal line.

Question 6

Sternoclavicular Insertion

Answer 6

Sternal Head: Manubrium of Sternum

Clavicular Head: Medial 1/3 of clavicle.

Question 7

Sternoclavicular Innervation

Answer 7

Spinal Accessory Nerve

Question 8

Sternoclavicular Action

Answer 8

contralateral rotation, extends neck, flexes cervical vertebrae so chin touches manubrium, extends superior cervical vertebrae while flexing inferior vertebrae so chin is thrust forward (bad posture, under bite).