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Muscles - Neck/Spine
Muscles of the Neck and Spine
| Question | Answer |
|---|---|
| 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
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