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1. | Origin: Margin of orbit Insertion: Eyelid and skin of face Action: Closes eye; blink | |
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2. | Origin: Maxilla and mandible Insertion: Skin of lips Action: Purses lips | |
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3. | Origin: Zygomatic bone Insertion: Mandible Action: Elevates mandible; mastication | |
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4. | Origin: Manubrium and clavicle Insertion: Mastoid process of temporal bone Action: Bilateral contraction flexes head at neck; Unilateral contraction bends neck towards shoulder or laterally rotates head | |
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5. | Origin: Inferior clavicle and fascia of chest Insertion: Inferior surface of mandible Action: Draws corners of mouth inferiorly and tenses skin of neck by drawing it superiorly | |
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6. | Origin: Inferior border of superior rib Insertion: Superior border of inferior rib Action: Elevates ribs | |
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7. | Origin: Superior boarder of inferior rib Insertion: Inferior boarder of superior rib Action: Depresses ribs | |
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8. | Origin: Inferior border of rib cage (Inferior costal aperture) Insertion: Central tendon Action: Contraction increases intra-thoracic space thereby decreasing intra-thoracic pressure | |
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9. | Origin: External, inferior borders of ribs Insertion: Linea alba and iliac crest Action: Flexes spine at the hip; compresses abdomen | |
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10. | Origin: Pubic bone (pubis) Insertion: Costal cartilages and xiphoid process Action: Flexes spine at the hip; compresses abdomen | |
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