Anatomy · MU Sofia

PNS · 215. Vascular and Fibrous layer of eyeball.

Covers the fibrous layer of the eyeball, describing the sclera with its three sublayers and the cornea with its five layers, then the vascular layer made up of the choroid, iris and ciliary body. The choroid section lists its layers, while the iris and ciliary body sections explain pupil constriction and dilation and lens accommodation, including the autonomic innervation involved.

Inside: 7 sections · 5 labelled pictures · 10 flashcards · 4 min

Topic 197 of 264 in the MU Sofia syllabus for Anatomy (Dental Medicine, Year 2). The free AceMed note covers it in 7 sections, about 613 words (4 min of reading), with 10 flashcards.

In this note

  1. FIBROUS LAYER of the eyeball
  2. The Sclera:
  3. The Cornea:
  4. VASCULAR LAYER (of the eyeball)
  5. Choroid:
  6. Iris:
  7. Ciliary body:

FIBROUS LAYER of the eyeball

  • The eyeball consists of three layers: fibrous, vascular & nervous (retina)

Gives mechanical stability to the eyeball.

  • Eyeball: spherodial sensory organ that recieves the visual stimuli & convays them to the brain.
  • The fibrous layer consists of two componants:
  1. 1. The sclera
  2. 2. The Cornea.

The Sclera:

  • Covers the posterior & lateral parts of the eyeball. (~85%)
  • It is an opaque (معتم), white layer of dense connective tissue.
  • It is pierced by neumerous vessels & nerves, including the optic nerve posteriorly
  • Provides attachment for the extraocular muscles.
  • Covered by the fascial seath externally & internally is loosely attached to the choroid of the vascular layer.
  • Composed of 3 layers:
  1. 1. Episclera
  2. 2. Scleral stroma
  3. 3. Lamina fusca - "pigmented"

The Cornea:

  • Is a clear, dome-shaped structure, covers the anterior 1/6 of the surface of the eyeball.
  • Transparent:
  • ↳ Transperancy allowing light to pass through & enter the eye.
  • ↳ the lack of blood vessels in the cornea contributes to its clarity
  • Consists of 5 layers:
  1. 1. Epithelium
  2. 2. Bowman's layer
  3. 3. Stroma
  4. 4. Descemet's membrane
  5. 5. Endothelium.

outer ↓ Inner

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