BIOL 1410 Lecture Notes - Lecture 20: Ciliary Body, Sclera, Choroid
15 Dec 2015
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Avascular connective tissue (ct: cornea (transparent) Vascular mucous membrane: when vessels dilate = bloodshot eyes, vascular tunic. Contains melanin (prevents light from bouncing back. Ciliary muscle + ciliary processes focus the lens: choroid (posterior) out) Highly vascular: ciliary body (anterior, iris, pupil. Hole in iris: nervous (sensory) tunic = retina: Parts: [15. 6: outer pigmented layer, inner neural layer. 3 layers of neurons: photoreceptors (2 types) Cones - colour: bipolar cells, ganglion cells. Axons from optic nerve (= cranial nerve. = area of greatest visual acuity (lots of photoreceptors) Blind spot where blood vessels + optic nerve exit eye. Cataracts = clouding of lens: anterior segment. Contains aqueous humor: fluid similar to plasma, posterior segment. Contains vitreous humor: gel-like, special senses: ear. Elastic cartilage, covered with skin: external auditory canal (meatus, tympanic membrane (eardrum, middle ear. Parts: eustachian tube, ear ossicles, malleus, incus, stapes. Transmits sound to inner ear via oval window: inner ear (labyrinth) Tunnels in temporal bone: contain perilymph.
