PHIL 2130 Lecture Notes - Lecture 18: Bony Labyrinth, Ear Canal, Eustachian Tube
6 May 2020
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Document Summary
Color blindness is the inherited inability to distinguish between certain colors. It results from the absence of one of the three types of cones. Nightblindness or nyctalopia: results from a vitamin a deficiency. Receptor potential in rods and cones graded potentials in bipolar neurons and horizontal cells nerve impulses in ganglion cells optic (ii) nerve optic chiasm optic tract thalamus (large geniculate nucleus) primary visual area of cerebral cortex in occipital lobe. The left side of a picture that we see forms on the right side of the brain and vice versa. External ear: has aurical (pinna), external auditory canal, and tympanic membrane (eardrum). Also has ceruminous glands, which secrete earwax (traps pathogens and protects middle and inner ear) In between the external ear and middle ear is the tympanic membrane or eardrum, which converts soundwaves to vibrations. Middle ear: has auditory ossicles: malleus (hammer), incus (anvil) and stapes (stirrup_. There are muscles which create tension for the tiny ossicles.
