Chapter 11 - Axial muscles
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Created by:
Jessicacknox on December 9, 2011
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27 terms
Terms | Definitions |
|---|---|
 Buccinator | Presses cheek against molar teeth |
| Frontalis (frontal belly of occipitofrontalis | Draws scalp forward, raises eyebrows, wrinkles forehead |
| Occipitalis (occipital belly of occipitofrontalis) | Draws scalp backward |
| Orbicularis oris | Compresses and purses lips (kiss muscle) |
| Orbicularis oculi | Closes eye (blink muscle) |
| Platysma | Pulls lower lip inferiorly, tenses skin of neck |
| Zygomaticus | Pulls corners of mouth superiorly (smiling muscle) |
| Temporalis | Elevates and retracts mandible |
| Masseter | Elevates and protracts mandible; jaw closure |
| Genioglossus | Protracts tongue |
| Styloglossus | Elevates and retracts tongue |
| Hyoglossus | Depresses and retracts tongue |
| Palatoglossus | Elevates post part of tongue |
| Superior, middle, and inferior pharyngeal constrictors | Constrict in series during swallowing |
| Sternocleidomastoid | Unilateral: lateral flexion with rotation of head to opposite side. Bilateral: flexes head and neck. |
| Splenius capitus and Splenius cervicus | Unilateral: turns head to same side. Bilateral: extends head and neck. |
| Scalene muscles | Flex neck (when 1st rib is fixed); elevate 1st and 2nd ribs during forced inhalation when neck is fixed. |
| External intercostals | Elevate ribs during normal inspiration |
| Internal intercostals | Depress ribs during forced exhalation; antagonists to external intercostals |
| Diaphragm | Contraction depresses (flattens) diaphragm and expands the thoracic cavity during normal inspiration |
| External obliques | Bilateral: flexes vertebral column and compresses abdominal wall. Unilateral: lateral flexion of vertebral column. |
| Internal obliques | Bilateral: flexes vertebral column and compresses abdominal wall. Unilateral: lateral flexion of vertebral column. |
| Transversus abdominis | Bilateral: flexes vertebral column and compresses abdominal wall. Unilateral: lateral flexion of vertebral column. |
| Rectus abdominis | Flexes vertebral column and compresses abdominal wall |
| Erector spinae | Extend neck and vertebral column; maintain posture; laterally flex vertebral column |
| Transversospinalis group | Extend neck and vertebral column; maintain posture; laterally flex vertebral column; |
| Quadratus lumborum | Extend neck and vertebral column; maintain posture; laterally flex vertebral column; |
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