Term
|
Definition
| outermost tunic composed of the cornea (anterior 1/6) and the sclera (posterior 5/6) |
|
|
Term
|
Definition
| primary focusing medium of the eye |
|
|
Term
| most superficial layer of cornea |
|
Definition
| thin nonkeratinized stratified squamous epithelium. contains many free nerve endings (painful when damaged). high rate of cell division (capable of repair). |
|
|
Term
|
Definition
| thick basement membrane of cornea composed of ground substance and reticular fibers |
|
|
Term
|
Definition
| core of cornea. responsible for 90% of thickness. many layers of collagen bundles. fibers parallel in each layer alternating layers turned 90degrees. fibroblasts between layers |
|
|
Term
|
Definition
| thick atypical basement membrane containing elastin and granulated collagen fibers |
|
|
Term
|
Definition
| junction between the cornea and sclera |
|
|
Term
|
Definition
| simple squamous epithelium lining the cornea's internal surface |
|
|
Term
|
Definition
| opaque fibrous connective tissue that covers the eye's posterior 5/6. provides insertio points for the 6 extraocular muscles |
|
|
Term
|
Definition
| middle tunic of the eye composed of three major components: choroid, ciliary body, and iris |
|
|
Term
|
Definition
| highly vascularized connective tissue layer. provides blood supply to retinal cells |
|
|
Term
|
Definition
| ring like triangular thickening at the level of the lens |
|
|
Term
|
Definition
| irregular epithelium-covered connective tissue outgrowths of the ciliary body extending towards the lens |
|
|
Term
|
Definition
| suspensory ligaments that originate on ciliary processes |
|
|
Term
| cuboidal epithelium lining of ciliary processes |
|
Definition
| stratified: basal cells highly pigmented and continuous with pigment of retina. lumenal cells produce aqueous humor |
|
|
Term
|
Definition
| structural filler plus nutritional medium for both anterior and posterior chamber |
|
|
Term
|
Definition
| groups of smooth muscle bundles near the juction of the ciliary body and sclera. change the shape of the lens to accomodate for near or far vision |
|
|
Term
|
Definition
| controls amount of light reaching the retina and gives the eye its color |
|
|
Term
|
Definition
| lined with connective tissue. endothelial cells lost during early childhood |
|
|
Term
|
Definition
| consists of highly vascularized connective tissue. abundant fibroblasts and melanocytes. |
|
|
Term
|
Definition
| pigmented and non-pigmented myoepithelial cells arranged in radial pattern. under sympathetic control. |
|
|
Term
|
Definition
| circular band of smooth muscle. under parasympathetic control. |
|
|
Term
| posterior surface of iris |
|
Definition
| lined with highly pigmented cells |
|
|
Term
|
Definition
| located and junction of iris and cornea. drains excess aqueous humor into venous sinuses. fluid percolates across corneal endothelium plus endothelial lining |
|
|
Term
|
Definition
| photosensitive portion of the eye |
|
|
Term
|
Definition
| melanin-rich simple cuboidal epithelium. pigment absorbs photons not absorbed by photoreceptors. have apical microvilli. Bruch's membrane. |
|
|
Term
|
Definition
| elastin rich basement membrane that separates pigmented epithelium from choroid |
|
|
Term
|
Definition
| three layers of cells give rise to nine distinguishable layers |
|
|
Term
|
Definition
| rods and cones. composed a cell body, inner segment and outer segment. |
|
|
Term
|
Definition
|
|
Term
|
Definition
| contains stacks of flat vesicles that contain light sensitive visual pigments. cradled in microvilli of pigmented epithelium. senescent photoreceptor vesicles phagocytized by pigmented epithelia |
|
|
Term
| middle nuclear layer of retina |
|
Definition
| bipolar cells, minor horizantal cells, amacrine cells. interneurons between photoreceptors and ganglion cells |
|
|
Term
|
Definition
| unipolar neurons that form innermost layer of nuclei. axons travel on innermost surface, eventually exiting the eye as the optic nerve. |
|
|
Term
|
Definition
| conical depression in retina that lies opposite the center of the lens. highest concentratio of cones. region with greatest visual acuity. |
|
|
Term
|
Definition
| small yellowish disk of fovea visible during opthalmic inspection |
|
|
Term
|
Definition
| site where ganglion cells axons exit the eye as the optic nerve. where axons become myelinated. no photoreceptors (anatomical blindspot). retinal blood vessels entter and leave. |
|
|
Term
|
Definition
| developed as outgrowth of forebrain. enveloped by meninges. |
|
|
Term
|
Definition
| composed primarily of water and hyaluronic acid. fibirls around periphery form its capsule. macrophages and fibrocytes sporadically found. |
|
|
Term
|
Definition
| developmental remnant of the hyaloid artery that extended from the optic disk through the vitreous to the lens |
|
|
Term
|
Definition
| elastic, biconvex structure that focuses light on the retina. nourished by aqueous humor as it is avascular with no nerves |
|
|
Term
|
Definition
| elastic and transport basal lamina. prevents penetration by wandering cells |
|
|
Term
|
Definition
| low cuvoidal to columnar near equator of lens |
|
|
Term
|
Definition
| long, narrow, hexagonal, anuclear, specialized epithelial cells that make up the bulk of the lens. each one stretches across entire anterior/posterior length of lens. adjacent cell membranes fused by a variety of plasma membrane specializations including juctional complexes and ridge like processes. filled with crystallins. undifferentiated remain at periphery. give rise to new throughout lifetime. |
|
|
Term
|
Definition
| covers the exposed part of the sclera. epithelium varies from stratified squamous to stratified cuboidal, both with abundant goblet cells with underlying connective tissue. reflects back to cover inside of eyelids. |
|
|
Term
|
Definition
| covered by skin anteriorly and conjuctiva posteriorly. contain voluntary skeletal muscle, glands, connective tissue |
|
|
Term
|
Definition
| dense connective tissue core that provides flexible support and harbors glands |
|
|
Term
|
Definition
| modified sebaceous glands for lubrication |
|
|
Term
|
Definition
| sebaceous glands of eyelashes |
|
|
Term
|
Definition
| tear-secreting compound tubuloalveolar glands located superiolaterally in bony orbits |
|
|
Term
|
Definition
| darkly staining. secretes lysozyme |
|
|
