Muscles of the Head and Neck Flashcards
(32 cards)
Platysma
Tenses neck and depresses (lowers) mandible (jaw)
- Innervated by CN 7 (eyebrows, nose, lips, facial expression)
Frontalis
Raises Eyebrow
Orbicularis Oris
Purses lips
Zygomaticus Major
Raises corners of lips
Buccinator
Compresses cheeks
Depressor anguli oris
Lowers corners of lips
Occipitalis
Tenses scalp
Orbicularis oculi
Closes eyelids
Masticate
Chewing (movements of the mandible_)
Pterygoid Muscles
Deep surface of the muscles and attach to pterygoid process of sphenoid
Masseter
Elevates mandible
Temporalis
Elevates mandible
Medial Pterygoid
Elevates jaw, moves jaw medially
Lateral Pterygoid
Protrudes the lower jaw
Extraocular Muscles
Innervated by CN 3,4,6
- Superior, inferior, lateral, and medial recuses are 90 degrees from each other
- Superior oblique, Inferior Oblique
Rectus
Straight path from a common origin in the back of the orbit to the eyeball
Meidal rectus
Turns eye medially
Lateral rectus
Turns eye laterally
superior rectus
Turns eye superiorly
inferior rectus
Turns eye inferiorly
superior oblique
Turns eye inferiorly and laterally
(attaches at back of orbit, passes through trochlea to eyeballs, turns eye down and out)
inferior oblique
Turns eye superiorly and laterally
(attaches obliquely to the eyeball like the superior oblique)
Superficial Neck Muscles
Trapezius and Sternocleidomastoid
Innervated by CN 11
Trapezius
Retract, elevate, depresses scapula; extends neck if used bilaterally