BMS107 - SELECTED AXIAL MUSCLES
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MUSCLES OF FACIAL EXPRESSION & MASTICATION
NAME ACTION REMARKS
frontal belly of occipitofrontalis ("frontalis") elevates eyebrows is part of "epicranius"
orbicularis oculi closes eye blinking/squinting
orbicularis oris compresses lips "kissing muscle"
masseter elevates mandible prime mover of jaw closure
temporalis elevates mandible -
EXTRINSIC (EXTRAOCULAR) EYE MUSCLES
NAME ACTION REMARKS
medial rectus rotates eyeball medially -
lateral rectus rotates eyeball laterally -
superior rectus rotates eyeball superiorly -
inferior rectus rotates eyeball inferiorly -
superior oblique rotates eyeball inferiorly & laterally tendon passes through trochlea
inferior oblique rotates eyeball superiorly & laterally -
MUSCLES THAT MOVE THE HEAD
NAME ACTION REMARKS
sternocleidomastoid bilateral: flexes neck unilateral contraction flexes neck & rotates head to opposite side
scalenes flex neck, elevate ribs -
splenius capitis/cervicis extend neck unilateral contraction turns head to same side
semispinalis capitis extends neck -
MUSCLES OF THE VERTEBRAL COLUMN
NAME ACTION REMARKS
erector spinae extends vertebral column -
quadratus lumborum extends vertebral column unilateral contraction flexes vertebral column laterally
MUSCLES OF RESPIRATION
NAME ACTION REMARKS
external intercostals elevates ribs increase transverse dimension of thoracic wall
internal intercostals depress ribs involved in forced expiration
diaphragm expands thoracic cavity (inspiration) also compresses abdominal viscera
MUSCLES OF THE ABDOMINAL WALL
NAME ACTION REMARKS
external abdominal oblique compresses abdominal wall & flexes vertebral column unilateral contraction flexes vertebral column laterally
internal abdominal oblique compresses abdominal wall & flexes vertebral column unilateral contraction flexes vertebral column laterally
transversus abdominis compresses abdominal wall & flexes vertebral column unilateral contraction flexes vertebral column laterally
rectus abdominis compresses abdominal wall & flexes vertebral column partitioned by tendinous intersections
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Fall 2008