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MajorSkeletal Muscle

A&P Major Skeletal Muscles - Axial Region JCC

Orbicularis Oculi -closes and squints eyes -frontal bone; maxilla, lacrimal bone -the insertion and origin are the same
Levator Labii Superioris -elevates upper lip -maxilla -upper lip
Zygomaticus Major -elevates angle of the mouth (smile) -zygomatic bone -angle of mouth
Zygomaticus Minor -elvates upper lip -zygomatic bone -upper lip
Orbicularis Oris -closes mouth; protracts the lips (kissing, whistling) -entire surrounding of mouth -entire surrounding of mouth
Buccinator -compresses cheek against teeth to hold food during chewing -maxilla; mandible -lips
Masseter -elevates mandible at the temporomandibular joint -zygomatic bone; zygomatic arch -angle, ramus, and coronoid process of mandible
Temporalis -elevates mandible at the temporomandibular joint -temporal fossa -coronoid process and raumus of mandible
Sternocleidomastoid -flexes, extends, laterally flexes, and contralaterally rotates neck -manubrium of sternum; clavicle -mastoid process of temporal bone
Deltoid -abducts, flexes, extends, horizontally flexes, horizontally extends, laterally rotates and medially rotates the arm -clavicle; acromion process; spine of scapula -deltoid tuberosity of humerous
Pectoralis Major -adducts, medially rotates, flexes, and extends the arm -clavicle; sternum; costal cartliages of ribs 1-7 -bicipital groove of the humerus
Serratus Anterior -protracts and upwardly rotates scapula; is the boxers punching muscle -ribs 1-9 -medial border of the scapula
Pectoralis Minor -protracts, depresses, and downwardly rotates the scapula -ribs 3-5 -corocoid process of scapula
Rectus Abdominis (6-pack muscles) -flexes and laterally flexes trunk (sit-up muscle) -pubis -xiphoid process of sternum; costal cartilages of ribs 5-7
External oblique -flexes, laterally flexes, and contralaterally rotates trunk (oblique sit-ups) -anterior iliac crest; pubis -ribs 5-12
Internal oblique -flexes, laterally flexes, and ipsilaterally rotates trunk -iliac crest -ribs 10-12
Diaphragm -prime mover of inhalation -internal surfaces of ribs, sternum, and vertebrae -central tendon of the diaphragm
Trapezius -elevates, depresses, retracts, and upwardly rotates scapula (shrug shoulders) -external occipital protuberance; spinous precesses of C7-T12 -lateral 1/3 of clavicle; acromion; spine of scapula
Latissimus Dorsi -medially rotates adducts, and extends the arm -spinous processes T7-L5 vertebrae, sacrum; illiac crest -bicipital groove of humerus
Origin One attachment site is stationary or less movable
Insertion more movable
Fixator specialized type of synergist. Fixating muscles; tension is exerted at the insertion
Antagonists muscles that oppose or reverse a movement
Synertists helping doing a movement
Prime Movements primarily responsible for a movement
Created by: whoaaaahannah