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Axial Muscles

TermDefinition
O: galea aponeurotica I: skin of eyebrows and root of nose A: Raises eyebrows, winkles forehead Frontal belly of occipitofrontalis
O: occipital and temporal bones I: galea aponeurotica A: Fixes aponeurosis and pulls scalp posteriorly Occipital belly of occipitofrontalis
O: frontal maxillary bones and ligaments around orbit I: tissue of eyelid A: closes the eye Orbicularis oculi
O: zygomatic bone I: skin and muscle at corner of mouth A: raises lateral corners of mouth upwards Zygomaticus (major and minor)
O: lateral fascia associated with masseter muscle I: skin at angle of mouth A: draws corner of lip laterally Risorius
O: arises indirectly from maxilla and mandible I: encircles mouth A: closes mouth Orbicularis oris
O: mandible below incisors I: skin of chin A: wrinkles chin Mentalis
O: molar region of maxilla and mandible I: orbicularis oris A: compresses cheek Buccinator
O: fascia of chest I: lower margin of mandible and skin/muscle at corner of the mouth A: helps depress mandible, produces downward sag of mouth Platysma
O: zygomatic arch and zygomatic bone I: angle and ramus of mandible A: primer mover of jaw closure, elevates mandible Masseter
O: temporalis fossa I: coronoid process of mandible A: closes jaw, elevates and retracts mandible Temporalis
O: lower margin of mandible (anterior belly) and mastoid process (posterior belly) I: by a connective tissue loop to the hyoid bone A: open mouth and depress mandible, elevated hyoid bone Digastric
O: manubrium and medial end of clavicle I: lower margin of hyoid bone A: depresses larynx and hyoid bone Sternohyoid
O: posterior surface of manubrium of sternum I: thyroid cartilage A: pulls larynx and hyoid bone inferiorly Sternothyroid
O: superior surface of scapula I: hyoid bone, lower border A: depresses and retracts hyoid bone Omohyoid
O: manubrium of sternum and medial portion of clavicle I: mastoid process of temporal bone A: flexes and laterally rotates the head Sternocleidomastoid
O: transverse process of cervical vertebra I: anterolaterally on first two ribs A: elevate first two ribs Scalenes
O: spinous process of C7-T6 I: mastoid process; transverse process of C2-C4 A: extend of hyperextend head Splenius
Lateral muscle of erector spinae Iliocostalis
Intermediate muscle of erector spinae Longissimus
Medial muscle of erector spinae Spinalis
O: iliac crest and lumbar fascia I: transverse process of upper lumbar vertebrae A: flexes vertebral column laterally Quadratus lumborum
O: pubic crest and symphysis I: xiphoid process and costal cartilages of ribs 5-7 A: flex and rotate lumbar region of vertebral column Rectus abdominis
O: by fleshy strips from outer surfaces of lower eight ribs I: most fibers insert into linea alba via a broad aponeurosis A: flex vertebral column; compress abdominal wall; trunk rotation; lateral flexion External oblique
O: lumbar fascia, iliac crest, and inguinal ligament I: linea alba, pubic crest, last three or four ribs A: flex vertebral column; compress abdominal wall; trunk rotation; lateral flexion Internal oblique
O: inguinal ligament, lumbar fascia, cartilages of last six ribs I: linea alba, pubic crest A: compresses abdominal contents Transversus abdominis
Created by: qclemenz
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