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J & S
Muscles (skull, facial, vertebral) & Actions
| Question | Action |
|---|---|
| Rectus capitis posterior major | Extends & rotates head |
| Rectus capitis posterior minor | Extends head |
| Obliquus capitis inferior | Rotates atlas |
| Obliquus capitis superior | Extends & bends head laterally |
| Splenius cervicis | Unilaterally (extend & hyperextend head & neck) Bilaterally (laterally flex, rotate head & neck) |
| Spinalis | Extends vertebral column |
| Longissimus | Extends, rotates head, Lateral flexes, extends vertebral column, Rotates ribs for forceful inspiration |
| Iliocostalis | Extension, lateral flexion of vertebral column, Rotates ribs for forceful inspiration |
| Depressor anguli oris | Depresses corner of mouth |
| Depressor labii inferiorus | Depresses lower lip |
| Serratus posterior superior | Raises ribs for inspiration |
| Serratus posterior inferior | Pulls ribs down, resists pull of diaphragm |
| Occipitalis (Epicranius) | Draws back scalp, Wrinkles forehead, Raises eyebrows |
| Frontalis (Epicranius) | Draws back scalp, Wrinkles forehead, Raises eyebrows |
| Orbicularis oris | Closure & protrusion of lips |
| Orbicularis oculi | Closes eyelids |
| Platysma | Depresses & draws lower lip laterally, Tightens skin of neck, Depresses mandible |
| Buccinator | Compresses cheek |
| Longus capitis | Unilaterally (rotate head) Bilaterally (flex head) |
| Longus colli | Flex cervical vertebrae |
| Mentalis | Elevates & protrudes lower lip (pouts) |
| Corrugator | Draws eyebrows toward nose |
| Risorius | Retracts angle of mouth (grinning) |
| Levator labii superioris | elevates upper lip “elvis” |
| Levator anguli oris | Depresses angle of mouth (frowning) |
| Temporomandibular Joint (TMJ) | Elevation, depression, side-side, protraction, retraction |