unilaterally: laterally flex the head and neck to same side. Rotate the head and neck to opposite side.
bilaterally: flex the head. Assist in inhalation (elevation of rib cage).
sternal head: top of manubrium.
clavicular head: medial 1/3 of the clavical.
Mastoid process of the temporal bone and the lateral portion of superior nuchal line of occiput.
elevate the mandible, (temporomandibular joint)
retract the mandible at the TMJ
example: clench your jaw
deep temporal branch of mandibular nerve.
medial pterygoid (action)
unilaterally: laterally deviate the mandible to the opposite side.
bilaterally: elevate the mandible and protract the mandible.
medial pterygoid (nerve)
lateral pterygoid (action)
unilaterally: laterally deviates themandible to the opposite side.
bilaterally: protract the mandible.
lateral pterygoid (nerve)
scalenes (anterior, middle, posterior) (action)
elevate upper ribs during inhalation.
assists in depression of the mandible at the TMJ.
tighten the fascia of the neck.
tightens corners of lips and keeps food between molars during mastication.
draws eyebrows medially and inferiorally. (frown muscle)
elevates mandible at TMJ.
occipitalis: anchor and retract the galea posteriorly. frontalis: raise the eyebrows and wrinkle forehead
orbicularis oris (action)
closes the mouth and shapes the lips.
orbicularis oris (nerve)
orbicularis oculi (action)
closes the eyelid.
orbicularis oculi (nerve)