Studydroid is shutting down on January 1st, 2019



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Front Back
origin
is the nonmoving point of attachment when a muscle contracts
insertion
point moves toward the origin
belly
the larger region of the muscle between the origin and the insertion is called the belly
muscles are categorized as
agonist (prime mover) antagonist (working against the agonist) synergist (helps the agonist)
orbicularis oculi
circular muscle thst encircles the eye (close eye)
orbicularis oris
circular muscle that encircles the mouth (closes & purses lips)
platysma
wide, flat muscle that covers lower mandible & entire anterior neck, & ends on chest (tenses neck skin; depresses mandible (pouting))
temporalis
lies over temporal bone (elevates & retracts mandible)
masseter
anterior to ear between zygomatic arch & posterior portion of mandible (elevates & retracts mandible)
trapezius
superficial muscle of the upper back & posterior neck (extends head & elevates scapula)
mylohyoid
deep muscle of chin extending from right side of mandible to left side (elevates hyoid bone & floor of oral cavity & depresses mandible)
omohyoid
lateral to sternohyoid (depresses hyoid bone)
sternohyoid
runs along midline of anterior neck (depresses hyoid bone)
sternocleidomastoid
strap-like muscle on anterior & lateral neck. fibers run diagonally across the neck from the sternum & clavicle to the mastoid process (bilateral contraction flexes head (prayer muscle). unilateral contraction laterally flexes head & rotates head to opposite side (as in saying no))
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