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Muscles - Neck/Spine

Muscles of the Neck and Spine

digastric origin: mastoid region of temporal bone and inferior surface of mandible
digastric insertion: hyoid bone
digastric has two bellies
digastric action: depresses mandible and/or elevates larynx
sternohyoid origin: clavicle and sternum
sternohyoid insertion: hyoid bone
sternohyoid thin muscle attaching sternum to the hyoid
sternohyoid action: depresses hyoid bone and larynx
stylohyoid origin: styloid process of temporal bone
stylohyoid insertion: hyoid bone
stylohyoid forms a muscular connection between the hyoid bone and the styloid process of the skull
stylohyoid action: elevates larynx
sternocleidomastoid origin: superior margins of sternum and clavicle
sternocleidomastoid insertion: mastoid region of skull
sternocleidomastoid extends from the clavicle and the sternum to the mastoid region of the skull
sternocleidomastoid action: both sides together flex the neck; one side alone bends head towards shoulder and turns face to opposite side
spinalis group origin: spinous processes and transverse processes of cervical, thoracic, and upper lumbar vertebrae
spinalis group insertion: base of skull and spinous processes of cervical, thoracic and upper thoracic vertebrae
spinalis group action: the two sides act together to extend vertebral column; either alone extends neck and laterally flexes head or rotates vertebral column to that side
longissimus group origin: processes of lower cervical, thoracic, and upper lumbar vertebrae
longissimus group insertion: mastoid process of temporal bone, transverse process of cervical vertebrae, and inferior surfaces of ribs
longissimus group action: the two sides act together to extend vertebral column; either alone rotates and laterally flexes head or vertebral column to that side
iliocostalis group origin: superior borders of ribs and iliac crest
iliocostalis group insertion: transverse processes of cervical vertebrae and inferior surfaces of ribs
iliocostalis group action: extends vertebral column or moves laterally to that side; moves ribs
quadratus lumborum origin: iliac crest
quadratus lumborum insertion: last rib and transverse processes of lumber vertebrae
quadratus lumborum action: together they depress ribs, flex vertebral column; one side acting alone produces lateral flexion
Created by: lizzy.spangler