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What is ciliary body? Functions of ciliary body.

Ciliary body:

It is the middle part of the uveal tract, which is directly continuous with the choroid behind and with the iris in front.

Functions of ciliary body:

1)      Suspension of lens.

2)      Accommodation.

3)      Secretion of acqeous humour (by non-pigmented cells)

4)      Secretion of some of the glycosaminoglycans of the vitreous body.

[Extra answer: Uveal tract: It is the middle vascular coat of the eyeball, which consists of the choroid, ciliary body and iris, forming a continuous structure]

[Ref: Gray’s Anatomy/38th/1326-1331]

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What is optic Atrophy? What are the types of optic Atrophy?

Optic atrophy:

Optic atrophy is the degeneration of optic nerve fibres with loss of their myelin sheaths and characterized by the pallor of the optic disc.

Types of optic atrophy/ Classification of optic atrophy:

  1. Aetiological classification:

1)      Primary

2)      Secondary

3)      Consecutive

  1. Anatomical Classification:

1)      Ascending optic atrophy

2)      Descending optic atrophy

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What is optic atrophy, optic neuritis?

Optic atrophy:

Optic atrophy is the degeneration of optic nerve fibres with loss of their myelin sheaths and characterized by the pallor of the optic disc.

Optic neuritis:

Optic neuritis is an inflammation or demyelinating disorder of the optic nerve.

[Ref: Basak/4th/340]

Classification of optic neuritis:

1)      Papillitis

2)      Neuroretinitis

3)      Retrobulbar neuritis

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What are the parts of optic nerve? Function optic nerve.

Parts of Optic nerve:       

1)      Intraocular – 1 mm

2)      Intraorbital – 24 mm

3)      Intracanalicular – 9 mm

4)      Intracranial – 16 mm

 

Total length 5.0 cm/ 50 mm

 

[Ref: Basak:4th/333]

Function of optic nerve:

            It transmits visual impulse from retina to the visual cortex.

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Ophthalmic artery is the branch of which artery?

The ophthalmic artery (OA) is the first branch of the internal carotid artery.

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Which muscle is responsible for closure of eye?
Conjunctivitis

Muscle responsible for closure of eye:

1)      Orbicularis oculi

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What are the muscles responsible for opening of eye?
Conjunctivitis

Muscles responsible for opening of eye:

1)      Levator palpebrae superioris – Elevate the upper eyelid

2)      Superior Tarsal – Elevates the upper eyelid

3)      Inferior Tarsal – Depress the lower eyelid

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