The Special Senses External Anatomy of the Eye.

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Presentation transcript:

The Special Senses

External Anatomy of the Eye

Lacrimal Apparatus of the Eye

Anatomy of the Eyeball

Accessory structures of the Eye from a sagittal view

Detail view of the anterior anatomy of the eye

Photomicroscopic view of the Histology of the Eye showing the location of the central fovea

Intrinsic Eye Muscles and their response to light

The Visual Pathway

Light Refractory Pathway: 1.Bulbar Conjunctiva 2.Cornea 3.Aqueous Humor 4.Lens 5.Vitreous Humor 6.Ganglion Cell Layer 7.Inner Synaptic Layer 8.Bipolar Layer 9.Outer Synaptic Layer 10. Photoreceptor Layer

Abnormalities of The Eye: 1.Myopic - nearsighted 2.Hypermetropic - Farsighted 3.Presbyopia - age-related failure of lens to accommodate 4.Astigmatism - Distorted vision due to irregular-shaped lens or cornea 5.Color Blindness - genetic defect that causes dysfunction of cones

Accommodation of the Lens for near vision Ciliary muscles contract Ciliary body pulls forward and inward Tension on suspensory ligaments of lens is decreased Lens becomes thicker (rounder) due to its elasticity Pupils constricts

Accommodation of the Lens for far vision Ciliary muscles relaxes Ciliary body returns to its resting state, backward and outward Tension on suspensory ligaments of lens is increased Lens becomes thinner (flatter) due to its elasticity Pupils dilate

Autonomic Nervous System

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