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Describe the structure of the eye with diagrams.

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Structure of Eye Orbits: 

  • Each eye is attached movably with the help of 6 eye muscles in the eye orbit.
  • These eye muscles are voluntary & striated. 
  • There are 4 rectus & 2 oblique eye muscles which are as follows 

1.Anterior or external rectus (Lateral Rectus): 

  • It is attached to the outer lateral side of the eyeball. 
  • It receives Abducens cranial nerve. 

2. Posterior or internal rectus (Medial Rectus): 

  • It is attached to the inner (medial) side of the eyeball.
  • Oculomotor cranial nerve innervates it. 

3. Superior rectus: 

  • It is attached to the mid-dorsal side of the eyeball. 
  • It receives an oculomotor cranial nerve. 

4. Inferior rectus: 

  • It is attached to the midventral side of the eyeball. 
  • It receives an oculomotor cranial nerve. 

5. Superior oblique muscle:

  •  It is attached between the external rectus & superior rectus. 
  • It receives a trochlear cranial nerve. 

6. Inferior oblique muscle: 

  • It is attached between the inferior rectus and external rectus. 
  • It receives an oculomotor cranial nerve.

Anterior rectus & posterior rectus muscles rotate the eyeball inside & outside. Superior rectus & inferior rectus rotate the eyeballs upside & downside.

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