4.1 H&N

Epicranial

Surprise

Orbicularis oculi

Closing eyelid & squinting

Corrugator supercilii

Frowning

Orbicularis oris

Closing & pursing lips as well as pouting & grimacing

Buccinator

Compresses the cheeks during chewing

Risorius

Stretching lips

Levator labii superioris

Raising upper lip

Levator labii superioris alaeque nasi

Raising upper lip & dilating nares with sneer

Zygomaticus major

Smiling

Zygomaticus minor

Raising upper lip to assist in smiling

Levator anguli oris

Smiling

Depressor anguli oris

Frowning

Depressor labii inferioris

Lowering lower lip

Mentalis

Raising chin & protruding lower lip

Platysma

Raising neck skin & grimacing

The _______ is the end of the muscle that is attached to the least movable structure

origin

The _______ is the other end of the muscle and is attached to the more movable structure

insertion

The _______ is the movement that is accomplished when the muscle fibers contract

action

What are the 6 main groups of muscles of the head & neck?

cervical muscles, facial expression muscles, mastication muscles, hyoid muscles, tongue muscles, pharynx muscles

What are the 2 cervical muscles?

sternocleidomastoid & trapezius

Sternocleidomastoid:

origin & insertion?

Origin: clavicle and sternum

Insertion: posterior & inferior of external acoustic meatus of each ear