PSB-2000 Lecture Notes - Lecture 7: Side Effect, Medial Geniculate Nucleus, Hindbrain
Document Summary
Audition: transforming physical energy in the world into electrical energy in our bodies. Human hearing curve: humans can hear frequencies 20-20,000 hz, hea(cid:396)i(cid:374)g is (cid:862)tu(cid:374)ed(cid:863) to(cid:449)a(cid:396)ds hu(cid:373)a(cid:374) spee(cid:272)h. The ear: three major divisions: outer ear: Semicircular canal for vestibular sensations (e. g. balance, motion. The middle ear detection: tympanic membrane. Tapes (cid:373)akes (cid:272)o(cid:374)ta(cid:272)t (cid:449)ith (cid:272)o(cid:272)hlea"s o(cid:448)al (cid:449)i(cid:374)do(cid:449: mechanically links outer and inner ear, amplifies signal. The cochlea: snail-shaped structure filled with fluid. Fluid harder to move than air so amplification in middle ear is important: along the length of the cochlea, runs an internal membrane called the organ of. Epa(cid:396)ate (cid:272)ha(cid:373)(cid:271)e(cid:396) (cid:272)(cid:396)eated (cid:271)(cid:455) t(cid:449)o fle(cid:454)i(cid:271)le (cid:373)e(cid:373)(cid:271)(cid:396)a(cid:374)es (reiss(cid:374)e(cid:396)"s a(cid:374)d. Basilar: hair cells line the basilar membrane, the tallest hair (cilia) of each cell sticks into the gelatinous tectorial membrane above, movement of hairs activates hair cells. How does movement trigger electrochemical signal: when hairs bend, ion channels are pulled open, potassium enters and depolarizes hair cell.
