Extraocular muscle
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There are six extraocular muscles that control movement of the eyeball: the superior and inferior rectus muscles, the medial and lateral rectus muscles, and the superior and inferior oblique muscles. These muscles originate from various parts of the orbit and insert into the sclera. Each muscle is innervated by a specific cranial nerve and has primary, secondary, and tertiary actions responsible for moving the eyeball in different directions.
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Extraocular muscle
- 2. EXTRAOCULAR MUSCLE HUMAN EYE THERE ARE SIX EXTRAOCULAR MUSCLES. WHICH ARE HELPS TO MOVEMENTS OF THE EYE IN THE DIFFERENT DIRECTION AND THE SUPERIOR EYELID. THE EXTRAOCULAR MUSCLES ARE LOCATED WITHIN THE ORBIT.
- 3. EXTRAOCULAR MUSCLES ARE 1. SUPERIOR RECTUS MUSCLE 2. INFERIOR RECTUS MUSCLE 3. MEDIAL RECTUS MUSCLE 4. LATERAL RECTUS MUSCLE 5. SUPERIOR OBLIQUE MUSCLE 6. INFERIOR OBLIQUE MUSCLE. • THERE IS ANOTHER ONE MUSCLE WHICH IS RESPONSIBLE FOR SUPERIOR EYELID MOVEMENT - LEVATOR PALPEBRAE MUSCLE.
- 4. MUSCLES OF EYE MOVEMENTS • THERE ARE SIX MUSCLES INVOLVE IN THE CONTROL OF THE EYEBALL MOVEMENT. • THEY ARE DIVIDED INTO TWO PARTS --------- A. FOUR RECTI MUSCLE B. TWO OBLIQUE MUSCLE
- 5. SUPERIOR RECTUS • ORIGIN-- • ORIGINATES FROM THE SUPERIOR PART OF THE COMMON TENDINOUS RING. • INSERTION-- • ATTACHES TO THE INFERIOR & ANTERIOR ASPECT OF THE SCLERA. • DISTANCE- 7.9 mm • NERVE SUPPLY--- 3rd CRANIAL NERVE. • ACTION----- • PRIMARY-- ELEVATION • SECONDARY--- INTORTION OR MEDIAL ROTATION OF THE EYEBALL. • TERTIARY-- ADDUCTION
- 6. 2. INFERIOR RECTUS • ORIGIN----- • ORIGINATES FROM THE SUPERIOR PART OF THE COMMON TENDINOUS RING. • INSERTION-- • ATTACHES TO THE INFERIOR & ANTERIOR ASPECT OF THE SCLERA. • DISTANCE- 6.8mm • NERVE SUPPLY--- 3rd CRANIAL NERVE. • ACTION----- • PRIMARY-- DEPRESSION • SECONDARY--- EXTORTION OR LATERAL ROTATION OF THE EYEBALL. • TERTIARY-- ADDUCTION
- 7. 3. MEDIAL RECTUS • ORIGIN----- • ORIGINATES FROM THE SUPERIOR PART OF THE COMMON TENDINOUS RING. • INSERTION-- • ATTACHES TO THE INFERIOR & ANTERIOR ASPECT OF THE SCLERA. • DISTANCE- 5.3mm (CLOSEST MUSCLE FROM THE LIMBUS) • NERVE SUPPLY--- 3rd CRANIAL NERVE. • ACTION----- • PRIMARY-- ADDUCTION
- 8. 4. LATERAL RECTUS • ORIGIN----- • ORIGINATES FROM THE SUPERIOR PART OF THE COMMON TENDINOUS RING. • INSERTION-- • ATTACHES TO THE INFERIOR & ANTERIOR ASPECT OF THE SCLERA. • DISTANCE- 6.9mm • NERVE SUPPLY--- 6th CRANIAL NERVE. • ACTION----- • PRIMARY-- ABDUCTION
- 9. 5.SUPERIOR OBLIQUE MUSCLE • ORIGIN-- • ORIGINATES FROM THE BODY OF THE SPHENOID. • INSERTION--- • UPPER PORTION OF THE SCLERA. • NERVE SUPPLY- 4th CRANIAL NERVE • ACTION-- • PRIMARY-- INTORTION OR MEDIAL ROTATION OF THE EYEBALL. • SECONDARY-- DEPRESSION • TERTIARY-- ABDUCTION
- 10. 6.INFERIOR OBLIQUE MUSCLE • ORIGIN-- • ORIGINATES FROM THE ANTERIOR ASPECTS OF THE ORBITAL FLOOR. • INSERTION--- • LOWER AND OUTER PART OF THE SCLERA. • NERVE SUPPLY- 3rd CRANIAL NERVE • ACTION-- • PRIMARY-- EXTORTION OR LATERAL ROTATION OF THE EYEBALL. • SECONDARY-- ELEVATION • TERTIARY-- ABDUCTION