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Principle Skeletal Muscles 1 Muscles of Facial Expression, Muscles that Move the Mandible and Muscles that Move the Eyeballs.

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Presentation on theme: "Principle Skeletal Muscles 1 Muscles of Facial Expression, Muscles that Move the Mandible and Muscles that Move the Eyeballs."— Presentation transcript:

1 Principle Skeletal Muscles 1 Muscles of Facial Expression, Muscles that Move the Mandible and Muscles that Move the Eyeballs

2 Muscles of Facial Expression The muscles of facial expression provide humans with the ability to express a wide variety of emotions. The muscles themselves lie within the layers of superficial fascia. The origins are generally in the fascia or bones of the skull and insertions into the skin of the face

3 Occipitofrontalis Front and Occipital Bellies Front Belly:  Origin – Epicranial Aponeurosis  Insertion – Skin superior to orbit  Action – Draws scalp forward, raises eyebrows and wrinkles skin of forehead horizontally Occipital Belly  Origin – Occipital and Temporal Bones  Insertion – Epicranial Aponeurosis  Action – Draws scalp backwards

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5 Orbicularis Oris Origin – muscle fibers surrounding opening of mouth Insertion – Skin at corner of mouth Action – Closes and protrudes lips, compresses lips against teeth and shapes lips during speech

6 Zygomaticus Major Origin – zygomatic bone Insertion – Skin at angle of mouth and orbicularis oris Action – Draws corners of mouth outward and upward as in smiling

7 Buccinator Origin – Maxilla and Mandible Insertion – Orbicularis Oris Action – presses cheeks against teeth and lips, as in whistling; draws corner of mouth laterally, assists in chewing be keeping food between teeth

8 Platysma Origin – Fascia over deltoid and pectoralis major muscles Insertion – Mandible, muscles around mouth and skin of lower face Action – Draws outer part of lower lip downward and backward as in pouting; depresses mandible

9 Orbicularis Oculi Origin – Medial wall of orbit Insertion – Circular path around orbit Action – Closes eye; wrinkles forehead vertically

10 Levator Palpebrae Superioris Origin – Roof of Orbit Insertion – Skin of upper eyelid Action - Opens Eye

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12 Muscles that Move the Mandible Also known as muscles of mastication because they are used for biting and chewing. These muscles also assist in speech.

13 Masseter Origin – Maxilla and Zygomatic Arch Insertion – Mandible Action – Elevates and retracts mandible

14 Temporalis Origin – Temporal Bone Insertion – Mandible Action – Elevates and retracts mandible

15 Medial Pterigoid Origin – Sphenoid bone and maxilla Insertion – Mandible Action – elevates and protracts mandible and moves mandible from side to side

16 Lateral Pterygoid Origin – Sphenoid Bone Insertion – TMJ Action – Protracts mandible, depresses mandible and moves mandible from side to side

17 Muscles that Move the Eyeballs Movement of the eyeballs are controlled by three pairs of extrinsic muscles. These are among the fastest contracting and most precisely controlled skeletal muscles of the body.

18 Superior Rectus/Inferior Rectus Superior:  Origin – Tendinous ring attached to bony orbit around the optic foramen  Insertion – Superior and central part of the eyeball  Action – Moves eyeball upward and medially and rotates its medially Inferior:  Origin - Tendinous ring attached to bony orbit around the optic foramen  Insertion – Inferior and central part of the eyeball  Action – Moves eyeball downward and medially and rotates it laterally

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20 Lateral/Medial Rectus Lateral:  Origin – Tendinous ring attached to bony orbit around the optic foramen  Insertion – Lateral Side of Eyeball  Action – Moves eyeball laterally Medial:  Origin – Tendinous ring attached to bony orbit around the optic foramen  Insertion – Medial Side of Eyeball  Action – Moves eyeball medially

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22 Superior/Inferior Oblique Superior:  Origin – Tendinous ring attached to bony orbit around the optic foramen  Insertion – Eyeball between superior and lateral recti  Action – moves eyeball downward, laterally and rotates medially Inferior:  Origin – Maxilla  Insertion – eyeball between inferior and lateral recti  Action – moves eyeball upward and laterally and rotates it laterally

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