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MajorSkeletal Muscle
A&P Major Skeletal Muscles - Axial Region JCC
| Question | Answer |
|---|---|
| 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:
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