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25 Cards in this Set
- Front
- Back
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MUSCLE AROUND EYE? |
Orbicularis oculi |
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PARTS |
Orbital part Palpebral part Lacrimal Part |
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ORBITAL PART ORIGIN |
1. Medial palpebral lig 2. Medial surface of bony orbit 3. Lacrimal bone |
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Orbital part insertion |
It curves around orbital margin and inserts into lower border of medial palpebral lig (point of origin) |
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Palperbral part origin and insertion |
Medial part of medial palpebral ligament Inserts into lateral palpebral raphae |
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Lacrimal part origin |
Lacrimal crest and lacrimal fascia |
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Lacrimal part insertion |
Passes laterally infront of tarsal plates and inserts into lateral palpebral raphae. |
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NS |
Two nerves 1. Temporal br 2. Zygomatic br Both are br of facial nerve |
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ACTION |
O part - closes eyelid forcefully as in winking P part closes eye gently as in blinking L part dilates lacrimal sac and helps in drainage of lacrimal fluid |
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Muscles around mouth |
Orbicularis oris |
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Parts? |
1. Extrinsic 2. Intrinsic |
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Origin of extrinsic part |
Other facial muscles wch converge around mouth namely buccinator and elevators and depressors of lips and their angles |
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Extrinsic part insertion |
At modiolous they form chiasma Upper fibres-> upper lip Lower fibres -> lower lip Middle fibres -> decussate.... |
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Intrinsic part origin |
Mental slips and incisive slips arising from alveloar process of mand and maxilla resp |
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Intrinsic part insertion |
Angle of mouth |
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NERVE SUPPLY OF ORIS |
Buccal br of facial nerve |
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Action |
Closing mouth Protruding or pouting or pursuing Kissing Aids in speech |
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Muscle of cheek |
Buccinator |
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Fibre division |
Upper fibres Middle Lower |
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Upper fibre origin and insertion |
O from alveolar pr of maxilla opp 3rd molar I into upper lip |
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Lower fibres attachment |
O from alveolar pr of mand opp 3rd molar I into lower lip |
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Middle fibres ORIGIN |
Pterygomandibular raphae btw hamulus of med pterygoid plate and mylohyoid line Fibrous band btw pterygoid hamulus and max tuberosity
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Middle fibres insertion |
Decussate at angle of mouth |
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Nerve supply |
Buccal br of facial nerve |
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Action |
Flattens cheek against gums and teeth. Hence it prevents accumulation of food in the vestibule of mouth. Helps in blowing air btw lips |
