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Muscular system (physiology of muscle contraction (Excitation (1)-Nerve…
Muscular system
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mouth muscles
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mentalis-elevates and wrinkles skin of chin, protrudes lower lip
buccinator-compress the cheeks against the teeth (blowing), mastication.
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Extraocular muscles
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superior-elevates, adducts, and rotates medially the eye
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inferior-extorsion, elevation, abduction
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chest
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inferior-depress the lower ribs, aiding in expiration
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nose muscles
procerus-Draws down the medial angle of the eyebrow, giving expressions of frowning
nasalis-Compresses bridge, depresses tip of nose, elevates corners of nostrils
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levator labii superioris alaeque nasi-dilates the nostril; elevates the upper lip and wing of the nose
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3 types of muscle tissues,
Smooth muscle.-organ walls and blood vessel walls, involuntary, spindle-shaped cells for pushing things
through organs
Cardiac Muscle-heart wall, involuntary, striated muscle with intercalated discs connecting cells for synchronized
contractions during heart beat.
skeletal-large body muscles, voluntary, striated muscle packed in bundles and attached to bones for
movement
Clavicular/neck
platysma -Draws the corners of the mouth inferiorly and widens it (as in expressions of sadness and fright). Also draws the skin of the neck superiorly when teeth are clenched
sternocleidomastoid-Acting alone, tilts head to its own side and rotates it so the face is turned towards the opposite side. Acting together, flexes the neck, raises the sternum and assists in forced inspiration.
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