head & neck region

a wrap to hold things together

a bundle of long tubes where a muscle is first subdivided into

draws corner of mouth laterally; compresses cheek inward (as in wristling); holds food between teeth during chewing

raws eyebrows medially and inferiorly; wrinkles skin of forehead vertically; pulls skin inferiorly and anteriorly; wrinkles brow

Function: draws lower lip inferiorly (depresses lower lip)

frontal belly raises eyebrows

occipital belly fixes aponeurosis & pulls scalp posteriorly

raises & furrows upper lips, opens lips

prime mover of jaw closure: elevates mandible

protrudes lower lip; wrinkles chin; eleavates and protrudes lower lip

Function: closes eyes, produces blinking, squinting, and draws eyebrows inferiorly

closes lips; purses and protudes lips (kissing & wristling muscle)

draws corner of lip laterally (to the side); tenses lip; zygomaticus synergist

Function: flexion of neck foward and rotate head toward shoulder on opposite side

Function: closes jaw; elevates & retracts mandible

Function: raises lateral corners of mouth upward (smiling muscles)

• major retracts & elevates corner of mouth
• minor retracts & elevates upper lip

• Medial - elevates mandible (synergist of temporalis & masseter) and aids in grinding movements
• Lateral - protracts jaw (moves it anteriorly), aids in grinding movements of teeth

moves eye laterally

elevates eye & turns it laterally

depresses eye and turns it medially

moves eye medially

depresses eye & turns it laterally

elevates eye and turns it medially

elevate hyoid bone, open mouth & depress mandible

elevates hyoid bone & base of tongue during swallowing

acting with sternothyroid & sternohyoid depresses larynx & hyoid bone if mandible is fixed, may also fled skull

tenses skin of neck, depresses mandible, pulls lower lip back & down

flex and slightly rotate neck, elevate ribs 1-2 (aid in inspiration)

as a group, extend or hyperextend head; when only 1 side is active, head is rotated & bent toward same side

acting with sternothyroid & omohyoid depresses larynx & hyoid bone if mandible is fixed, may also fled skull

acting with sternohyoid & omohyoid depresses larynx & hyoid bone if mandible is fixed, may also fled skull

depresses hyoid bonel elevates larynx if hyoid is fixed

extends head

acting together, extend head & vertebral column; acting independently right or left causes rotation toward opposite side

• EAR MUSCLE...
• Function: dampen sounds such as those produced from chewing

Function: taste, cleaning teeth

Function: extrinsic muscles that act to change the position the tongue (depresses and retracts tongue)

Function: raise the hyoid bone and draw it forward and to retract and depress the mandible

Function: assist in the actions of chewing and swallowing.

Function: elevates the larynx and pharynx

Function: depress hyoid bone & larynx during swallowing and speaking