anatomy

1. GROSS ANATOMY OF
THE EYE

2. •Cystic structure kept distended by the pressure inside it
•Shape-oblate spheroid
•Anterior and posterior poles
•Equator

3. • Dimensions
AP-24mm
Horizontal-23.5mm
Vertical diameter-23mm
Circumference-75mm
Vol-6.5ml
Weight-7g

4. SEGMENTS AND CHAMBERS
• Anterior segment
-crystalline lens, iris, cornea, anterior and posterior chambers
-Anterior chamber:
2.5mm deep in the center
anteriorly-cornea
postriorly-iris and part of ciliary body
aqueous humour-0.25ml

5. -Posterior chamber
triangular space
anteriorly-iris and part of ciliary body
posteriorly-lens and zonules
laterally-ciliary body
aqueous humour-0.06ml

6. • Posterior segment
-structures posterior to the lens

7. EYELIDS
• In front of the eyeball
• Function as -shutters
- spreads tear film
-helps in drainage of tears
• Canthi- at the medial and lateral angles(inner and outer
canthi)

8. CONJUNCTIVA
• Translucent mucous membrane
• Lines posterior surface of eyelid and anterior surface of
eyeball
• Extends between the lid margin and the limbus
• Encloses the conjunctival sac

9. Glands of conjunctiva
1. Mucin secretory glands
-goblet cells
-crypts of Henle
-glands of Manz
2. Accessory lacrimal glands
-glands of Krause
-glands of Wolfring

10. COATS OF THE EYEBALL
Fibrous coat:dense strong coat
i. Cornea
-transparent,avascular structure
-anterior 1/6 th of the fibrous coat of the eyeball

11. -thickness:
center-0.5-0.6 mm
periphery-1-1.2mm
ii. Sclera
-posterior 5/6 opaque part
- covered by Tenons capsule and conjunctiva

12. • Middle vascular coat
- iris,ciliary body,choroid

13. i. Iris
• anterior most part
• Circular disc shaped
• Pupil-aperture of 4mm diameter at the centre
• Forms anterior and posterior chambers
• Attached to the middle of the anterior surface of ciliary bod

14. ii. Ciliary body
-Forward continuation of choroid at ora serrata
-Triangular in cross section
-Iris is attached to the middle
-Inner side-anteriorly pars plicata and posteriorly pars plana

15. iii. Choroid
-posterior most part
-from optic disc to ora serrata
-inner surface: smooth, brown and in contact with pigment
epithellium of retina
-outer surface:rough and in contact with sclera

16. RETINA
Thin,delicate and transparent
Extends from optic disc to ora serrata
optic disc- the raised disc on the retina at the point of entry of
the optic nerve, lacking visual receptors and so creating a blind
spot.

17. Macula lutea-yellow spot-an oval yellowish area surrounding the
fovea near the centre of the retina in the eye, which is the region
of keenest vision.

18. Ora serrata
• Serrated margin