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Muscular System (Body movement terminology (Flexion (movement that…
Muscular System
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Muscles of head
Platysma
Pulls corners of mouth inferiorly, produces a downward sag of mouth
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Buccinator
Flattens cheek- whistling or blowing, compresses cheek to hold food between teeth during chewing
Orbicularis oris
Closes moth and protrudes lips, "kissing" muscle
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Orbicularis Occuli
Close eyes,squint,blink, and wink
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Sternocleidomastoid
Flex neck, action of bowing head "prayer" muscle
Muscles of arm
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Bicep Brachii
Prime mover for flexion of the forearm and acts to supinate the forearm, "it turns the core screw and pulls the cork"
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Muscles of trunk
Latissimus Dorsi
Extends and adducts the humerous, arm must be brought down in a power stroke
External Obliques
Flex vertebral column, but also rotate the trunk and bend it laterally
Rectus Abdominis
Flex vertebral column, compress abdominal contents during defication, childbirth, and forced breathing
Erector Spinae
Powerful back extensors and provides resistance that helps control the action of bending over at the waist
Trapezius
Extend head and elevate, depress, adducts, and stabalizes the scapula
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Muscle Tissues
Cardiac
Cells are long, cylindrical, branched, single nucleus // has striation // forms heart wall // intercalated disks // involuntary
Skeletal
Cells are long,cylindrical, parallel, and multinucleated // attached by tendons on bones // striated // voluntary
Smooth
Spindle-shaped and single nucleus // no striations, found in hollow walls of organs // involuntary
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