Anatomy of the EyeTunica FibrosaTunica VasculosaTunica Interna
Optical Components Transparent, admit light, refract rays focus images on retina. – Cornea Modified extension of choroid layer – Pupil Round opening in center of iris that allows light in Iris controls diameter, para & symp NS – thin diaphragm composed mostly of connective tissue and smooth muscle – Aqueous humor Secreted by ciliary body Flows from posterior chamber to anterior chamber &reabsorbed through canal of Schlemm (glaucoma if blocked) – Lens Suspended by suspensory ligament which attaches to ciliary body – Vitreous humor Transparent jelly behind lens
Production and Reabsorption of Aqueous Humor(Canal of Schlemm)
Neuronal layer of Retina
The optic nerves lead to the optic chiasm where The some of the fibers in the nerve trunks cross and some do not. Visual The optic tracts then lead to the lateralPathway geniculate nuclei of the thalamus . Each lateral geniculate nucleus actually receives information from both eyes. The lateral geniculate nuclei, bring together information from both eyes. Information is then passed on to the visual cortex in the occipital region of the cortex.
Shape Abnormalities of the Eyeball
THREE LAYERS CILIARY BODY 1. Fibrous Tunic SCLERA LENS 2. Vascular TunicANTERIOR CHOROIDCHAMBERAqueous Humor) VITREOUS BODY 3. RETINA Vitreous Humor OPTIC NERVE CORNEA PUPIL IRIS
SUPERIOR RECTUS MUSCLE LACRIMAL GLAND IRIS behind transparent CORNE MEDIAL RECTUS MUSCLATERAL RECTUS MUSCLE PUPIL SCLERA RIGHT EYE INFERIOR RECTUS MUSCLE NOSESUPERIOR & INFERIOR OBLIQUE MUSCLES are not shown