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axial muscle system

QuestionAnswer
orbicularis oris ORIGIN: mandible INSERTION: lips ACTION: closes and protrudes lips
sternocleidomastoid ORIGIN: manubrium INSERTION: mastoid process ACTION: flexion of the neck
rectus abdominis ORIGIN: pubic crest INSERTION: xiphoid process ACTION: stabilizes pelvis during walking
external oblique ORIGIN: external surfaces of inferior eight ribs INSERTION: iliac crest ACTION: rotation of trunk
pectoralis major ORIGIN: sternum INSERTION: lateral lip of bicipital groove of humerus ACTION: flexion of the arm
latissimus dorsi ORIGIN: iliac crest INSERTION: bicipital groove of humerus ACTION:
trapezius ORIGIN: posterior surface of occipital bone INSERTION: spine of scapula ACTION: elevate scapula
deltoid ORIGIN: spine of scapula INSERTION: deltoid tuberosity of humerus ACTION: act together to adduct the arm
origin remains fixed or stationary
insertion during muscle movement, the attachment that moves
prime mover (agonist) moves a specific action
antagonist muscle that directly opposes that action
synergists promoting or assisting in a specific action
fixators stabilizes joints or muscle origins so prime movers can act more efficiently
endomysium layer of connective tissue that encloses each fiber
perimysium layer of ct that encloses fascicles
epimysium layer of CT that encloses whole muscle
tendons connective tissue that attaches muscles to bones
aponeuroses attaches muscles to bones by membranous sheets
Created by: pammy7130
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