muscles of the human body!
DESCRIPTION
Muscles of the Human Body!. Head and Neck. Frontalis. Raises eyebrows, wrinkles forehead. Occipitalis. Tenses and retracts scalp (moves it back). Orbicularis Oculi. Blinking of eye; squinting; draws eyebrows down. Zygomaticus. Raises lateral corners of mouth upwards; smiling muscle. - PowerPoint PPT PresentationTRANSCRIPT
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Muscles of the Human Body!
Head and Neck
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FrontalisRaises eyebrows, wrinkles forehead
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OccipitalisTenses and retracts scalp (moves it back)
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Orbicularis OculiBlinking of eye; squinting; draws eyebrows down
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ZygomaticusRaises lateral corners of mouth upwards; smiling
muscle
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RisoriusDraws corner of lip laterally; synergist of
zygomaticus
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Levator Labii SuperiorisElevates upper lip
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Depressor Labii InferiorisDraws lower lip downward, as in a pout
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Depressor Anguli OrisDraws corners of mouth downwards and
laterally (“tragedy mask” grimace)
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Orbicularis OrisCloses Lips; purses and protrudes lips; kissing
and whistling muscle
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MentalisProtrudes lower lip; wrinkles chin
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BuccinatorCompresses cheek, as in
whistling and sucking, well developed in nursing infants. Holds food between teeth during chewing
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Platysma• Helps depress
mandible; pulls lower lip back and down (produces downward sag of mouth; tenses skin of neck (during shaving)
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Platysma
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MasseterPrime mover of jaw closure; Elevates mandible
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TemporalisSynergist to masseter; Elevates mandible
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DigastricOpen mouth (depress mandible); elevates hyoid
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Sternocleidomastoid
Prime mover of active head flexion; generally against resistance as when one raises head when lying on their back. Acting alone: each muscle rotates head toward shoulder on opposite side and tilts (laterally flexes) head to its own side.
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Sternocleidomastoid
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Scalenes
Elevates first two ribs (aids in inspiration). Flex and rotate neck
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Splenius – Capitis & Cervicis• Act as a group to extend or hyperextend the
head. When active on one side, head is rotated and bent laterally toward the same side
Splenius Capitis Splenius
Cervicis