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Verious parts can be activated individually; closes eyes, produces blinking, squinting, draws eyebrows inferiorly
Synergist of temporalis and masseter; elevates mandible; in conjunction with lateral pterygoid, aids in grinding
Pulls hyoid bone superiorly and anteriorly shortening the floor of the mouth, it draws the tongue forward
Contraction of both muscles of pair causes flexion of neck forward, generally against resistance, acting independently, rotate head toward shoulder on opposite side
Acting with sternothyoid and omohyoid depressed larynx and hyoid bone if madible is fixed, may also flex skull
Prime mover of arm flexions; adducts, medially rotates arm; with arm fixed, pulls chest upwards (forced inspiration)
Flexes and rotates vertebral column; increase abdominal pressure; fixes and depresses ribs; stabilizes pelvis during walking; used in sit-ups
Lateral rotations of humerus; helps hold head of humerus in glenoid cavity; stablizes shoulder
Retracts and stabilizes the scapula, elevates the vertebral border, and rotates the scapula to depress inferior angle
Prime mover to protract and hold scapula against chest wall; rotates scapula, causing inferior angle to move laterally and upward; essential to raising arm; fixed scapula for arm abduction
Most superficial lateral muscle, compresses abdominal wall; also aids muscle of back in trunk rotation and lateral flexions; used in oblique curls
Actin together, extend head and vertebral column; acting independently (right vs. left) causes rotation towards opposite side
Acting as a whole, prime mover of arm adduction; when only specific fibers are active, can aid in flexion, extension, and rotation of humerus
Extend and bend the vertebral column laterally; fibers of the longissimus also extend head
With ribs fixed, draws scapula forward and inferiorly; with scapula fixed, draws rib cage superiorly
As a group extend of hyperextend head; when only one side is active, head is rotated and bent towards same side
Extends head; raises, rotates, and retracts scapula and stabilizes it; superior fibers elevate scapular (shrugging shoulders); inferior fibers depress it
Elevates and adducts scapula; with fixed scapula, laterally flexes neck to the same side
Each flexes vertebral column laterally; together extend the lumbar spine and fix rib 12; maintains upright posture
Prime mover of arm extensions; adducts and medially rotates arm; brings arm down in power stroke, as in striking a blow
Adducts, retracts, elevates, and rotates the scapula so that the glenoid cavity faces downward and stablizes the scapula
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