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Muscular System (Muscles of Thigh & Leg (Gluteus Maximus (LOCATION:…
Muscular System
Muscles of Thigh & Leg
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Quadricep Group
LOCATION: vasti: femur ACTION: all extend knee, rectus femoris also flecxes hip or thigh
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Muscles of Head
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Buccinator
LOCATION: maxilla and mandible near molars ACTION: compresses cheek, whistles, sucking, holds food between teeth while chewing
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Platysma
LOCATION: connective tissue, covering of superior cheek muscles ACTION: pulls corners of mouth inferiority
Muscles of Arm
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Bicep Brachii
LOCATION: scapula and shoulder girdle, ACTION: flexes elbow and supinates forearm
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Deltoid
LOCATION: scapular spine & clavicle, ACTION: abducts humerus
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Muscles of Trunk
Trapezius
LOCATION : occipital bone, cervical and thoracic vertebrae ACTION: extends neck and adducts scapula
Latissimus Dorsi
LOCATION: lower spine, iliac crest ACTION: extends and adducts humerus
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Erector Spinae
LOCATION: iliac crest, ribs 3-12 and vertebrae ACTION: extends back
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Function
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Stabilizing joints, body posture and regulating organ volume
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Three Types of Muscle
Cardiac
Involuntary, forms heart wall. long, cylindrical, branched, and single central nucleus, has striations, joined to other cells
Smooth
Spindle-shaped cells, no striations, found in hollow walls
Skeletal
Cells are long, cylindrical, parallel, and multinucleated
Attached to bone by tendons, striated, voluntary