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Biomedical Anatomy
Muscles of Head, Neck, and Mastication
| Question | Answer |
|---|---|
| occipitofrontalis function | raises eyebrows and wrinkles forehead |
| orbicularis oculi function | closes eye |
| nasalis function | dilates nostrils |
| orbicularis oris | closes and purses lips |
| zygomaticus major | pulls corners of mouth upwards and outwards |
| zygomaticus minor | raises upper lip |
| buccinator | compresses cheek |
| platysma | wrinkles skin of neck |
| temporalis | elevates and retracts mandible |
| masseter | elevates mandible |
| medial pterygoid | opens and closes jaw. moves jaw from side to side and forwards and backwards |
| lateral pterygoid | opens and protrudes and laterally moves mandible |
| sternocleidomastoid | both muscles acting together flex neck. individually the muscles draw the head to that shoulder |
| splenius capitis | both muscles together extend neck. individual each muscle laterally flexes and rotates head |
| semispinalis capitis | both muscle together extend together. individually each muscle rotates the head |
| longissimus capitis | both muscles together extend head. individually muscle will turn face to the same side |
| trapezius | elevates and retracts scapula and depresses its medial aspect. extends and laterally flexes head and neck |