Muscles of the Human Body!
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Transcript of Muscles of the Human Body!
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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