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Visual pathway - d pupil opening eye appears as black spot...

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Visual pathway 1. start with rods and cones go to 2. bipolar neurons then to 3. ganglion cells 4. action potential enough to stimulate axons to exit eyeball to optic n. 5. nerves cross anterior to pituitary gland from optic chiasma- medial aspect 6. in chiasma some cross some stay some stay same side- lateral do not cross 7. optic tract extend into thalamus some terminate 8. from thalamus enter visual pathway to occipital lobes of cerebral cortex moisten and lubricates, drains into lacrimal canal into lacrimal sac to nasal cavity by the way of nasolacrimal duct e. extrinsic m. f. consist of three layers 1) fibrous- outer a) sclera- posterior composted of white, fibrous c.t., blood vessels b) cornea- anterior transparent, bulges outward 2) vascular- blood vessels a) choroid- dark brown vascular coat between sclera and retina, absorbs light minimize reflection b) ciliary body- anterior to choroid, consist of smooth m. connect lens by suspensory ligaments c) iris- doughnut shaped, colored part of eye, regulates amt. light entering eye
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Unformatted text preview: d) pupil- opening eye, appears as black spot e) lens- behind pupil and iris held in place by suspensory ligaments, tension relaxed lens more convex, when focus on close objects; tension increased lens flattens, occurs when looking at a distance 1)) anterior compartment two chambers divided by iris; anterior cavity between cornea and iris, Posterior chamber between iris and lens 2)) aqueous humor- clear watery fluid between chambers, recycled through blood stream 3)) posterior compartment behind lens called posterior cavity, gel like fluid helps support eyeball Called vitreous humor, not recycled 3) Nervous consist of retina, blood vessels a) function retina- detection of light and transportation of impulses to optic n. b) three layers of retina- Sensory layer 1)) nearest to retina responds to light (photoreceptor), rods and cones 2)) middle layer- bipolar neurons- transmit impulses to inner layer 3)) inner- multipolar with large cells called ganglion cells...
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