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Eye, Vascular Coat (uveal tract) ???? Retina-nervous -ant to ora serr-non-sensory -post-photosensitive, Fibrous Coat ???? Vascular Coat (uveal tract), Development 22nd day-optic grooves/sulci in neural folds -n. tube closes->become optic vesicle lens placode-overlying ectoderm thickening >>plac./vesic. invaginate -2-layer optic cup+lens vesicle inner layer-neuroretina-9 layers -all cells present by 7th mo. outer-Ret. Pig. Epith-pigment at 5th wk 35th-lens vesic. loses outside contact->lens ???? Blood vv. form in choroid fissures inf. surface of cup -allow hyaloid a. to reach inner eye ->distal degeneration prox->central a/v 7th wk-fissure fuses, makes pupil 3rd mo-cil. body/iris from optic cup 6th mo-dil/constrictor mm. dev.<-neuroecto. 8th mo-macular depression begins, 3 coats ???? Fibrous Coat, Iris-most. ant. part of uvea color varies w/ age/indiv post. pigmented epith dilator m-just ant to epith -myoepith cells -sympa fibers-sup. cerv. gang. constrictor m-parasymp-cil. gang. -closer to aperture ???? Pupil-central aperture, Outside to inside 1.Pigment epith-monolayer polyg cells -abs. light, prevent reflection -store, release Vit. A-rhodopsin recursor -phagocytose photorec. memb. 2.rods&cones layer-receptor parts 3.external (outer) limiting membrane -formed by Muller cells-(glial cells) -Muller-photoreceptor jcnal complexes 4.ext.(outer) nuclear layer-photorec. cell bodies 5.ext.(outer) plexiform layer-synapse -photorec(R&Cs)-dendrites of bipolar neurons ???? Cones-6.5 mill most in fovea centralis for color, vis. acuity tapered outer segment lamellae-memb. infoldings contain iodopsin, Rods-most num-130 mill for low light cylind. outer seg w/ rhodopsin -embedded in pig. epith throughout neuroretina lamellae-discont. w/ memb supplied by chorionic caps. Cones-6.5 mill most in fovea centralis for color, vis. acuity tapered outer segment lamellae-memb. infoldings contain iodopsin, Outside to inside 1.Pigment epith-monolayer polyg cells -abs. light, prevent reflection -store, release Vit. A-rhodopsin recursor -phagocytose photorec. memb. 2.rods&cones layer-receptor parts 3.external (outer) limiting membrane -formed by Muller cells-(glial cells) -Muller-photoreceptor jcnal complexes 4.ext.(outer) nuclear layer-photorec. cell bodies 5.ext.(outer) plexiform layer-synapse -photorec(R&Cs)-dendrites of bipolar neurons ???? Rods-most num-130 mill for low light cylind. outer seg w/ rhodopsin -embedded in pig. epith throughout neuroretina lamellae-discont. w/ memb, Fibrous Coat ???? Cornea-avascular-5 layers Corneal epith-strat squam non-ker 5-6 layers thick-7 day turnover -free nerve endings-blink reflex Bowman's memb.-thick bsmt, injury->scar impairs vision Stroma (propria)-|| coll. fibers, fibroblasts Descemet's memb.-thick bsmt of corn. endoth Corneal endothelium-simple squam/cub. xport ions->keep stroma dry->transparent, The Eye ???? 3 coats