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Histology 17
NSU
Spring 2009
Taken by: Gregory Rodocker
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Photoreceptor and
Audioreceptor Systems
The Eye Complex, highly developed
photosensitive organ Form
Light intensity
Color
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External Layer: Tunica fibrosa
Sclera Tough, white opaque layer of dense CT
with few fibroblasts on five sixths of theeyeball exterior
Cornea Colorless, transparent multilayered
structure that allows light to enter
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Middle or Vascular Layer
Actually contains the following
structures: Choroid Ciliary body
Iris
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Choroid
Highly vascularized loose CT filled
layer containing fibroblasts,
macrophages, lymphocytes, mastcells, plasma cells, collagen fibers and
elastic fibers
Melanocytes also present giving thelayer its characteristic black coloration
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Ciliary body
Anterior extension of the choroid
Contains several sets of muscles that
function in visual accommodation
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Ciliary processes
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Ciliary processes
Loose CT core
Fenestrated capillaries
Produces the aqueous humor Similar to plasma but with 0.1 % protein
compared to 7% in plasma
Travel through pupil to anterior chamberand drains via canal of Schlemm
Anchors lens in place via zonular
fibers
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Iris
Extension of choroid
Contains the round opening called the
pupil
Loose CT, Fibroblasts and
melanocytes
Dilator and sphincter pupillae muscles
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Lens
Lens capsule
Subcapsular Epithelium
Lens fibers
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Accommodation
Lens is stretched when looking at
distant objects by elasticity of ciliary
body To focus closer in, the ciliary muscles
contract; zonular fiber tension is
relieved and the lens thickens
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Retina
Innermost layer of the eye
Posterior photosensitive portion and
Anterior part covering ciliary body and
iris
Layers of photosensitive portion Pigmented epithelium
Neural portion
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The Ear
Internal Ear
Membranous labyrinth Cochlea
Utricle
Saccule
Semicircular canals
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Receptor hair cells
Each has 40-80
rigid stereocilia
(microvilli) and onecilium (kinocilium)
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