L10_NPB_101

L10_NPB_101 - Lecture 10 SmartSite: Lecture 10 Notes Review...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Lecture 10 SmartSite: Lecture 10 Notes Review Sensory Systems The Ear Announcements: None Reading (Recommended): Relevant por<ons of Chapter 6 Auditory system Ves<bular system 1 REV: Sensory Integra<on 1. Modality or type of sensory informa<on 2. Receptor type 3. AP firing rate of afferent propor<onal to s<mulus intensity 4. Rate of receptor adapta<on 5. Number of afferents firing 6. Receptor density / Receptor field size 7. Lateral inhibi<on 8. Labeled line coding 2 REV: Sound Wave Transmission Tympanic membrane vibrates when struck by sound waves Middle ear transfers vibra<ons through ossicles to oval window Pressure waves in cochlear fluid set basilar membrane in mo<on Recep<ve hair cells are bent as basilar membrane is deflected up and down Mechanical deforma<on of specific hair cells is transduced into afferent neural signals APs are transmiXed to auditory cortex in temporal lobe of brain for sound percep<on Fig. 6-36a, pg. 219 3 REV: Transmission of Sound Waves Fig. 6-36bc, pg. 219 4 Sound Transduc<on hXp://www.rockefeller.edu/labheads/hudspeth/graphicalSimula<ons.php 5 Cochlea Fig. 6-35ab, pg. 218 6 Auditory Receptors Fig. 6-357 pg. 220 7 Hair Cells Fig. 6-40, pg. 223; Fig 6-38c, pg 221 8 Sound Transduc<on Fig. 6-39, pg. 222 9 Ear - Ves<bular Fig. 6-32, pg. 215 10 Ves<bular - Equilibrium Ves<bular apparatus and receptors In inner ear Consists of 2 classes of receptors Semicircular canals (3 orthogonally-oriented canals per side) Detect rota<onal accelera<on or decelera<on in any direc<on Otolith organs (2 Macular receptors at right angles per side: utricle and saccule) Detect linear accelera<on Detect changes in rate of linear movement in any direc<on Provide informa<on important for determining head posi<on in rela<on to gravity 11 Equilibrium Neural signals generated in response to mechanical deforma<on of hair cells by specific movement of fluid and related structures Ves<bular input goes to ves<bular nuclei in brain stem and to cerebellum for use in maintaining balance and posture, controlling eye movement, perceiving mo<on and orienta<on 12 13 Ves<bule Fig. 6-41a, pg. 225 14 Semicircular Canals Hair cell bundles are aligned in mirrored orienta<on Rota<on depolarizes one set of hair cells and hyperpolarizes the hair cells in the opposite semicircular canal Fig. 6-41c, pg. 225 15 Semicircular Canals Fig. 6-41c, pg. 225 16 Hair Cell Receptors The response is similar to that in auditory hair cells Stereocilia bending toward the kinocilium: Depolariza<on Stereocilia bending away from the kinocilium: Hyperpolariza<on 17 Fig. 6-41d, pg. 225 Otolith Organs (macular receptors) Fig. 6-42a, pg. 226 18 Linear Accelera<on Fig. 6-40bc, pg. 221 19 Ves<bular Input-Output Rela<ons Fig. 6-43, pg. 227 20 ...
View Full Document

This note was uploaded on 04/28/2010 for the course NPB 101 taught by Professor Fuller,charles/goldberg,jack during the Spring '08 term at UC Davis.

Ask a homework question - tutors are online