Chapter 19 Flashcards
True or False: The fovea centralis has the sharpest vision because it is the area with the highest proportion of rods and almost no cones.
False
Check all that are functions of the spiral organ in hearing.
-The crista ampullaris contains hair cells that become distorted with vibrations.
-Sound waves cause pressure waves in the fluid in the inner ear, making the basilar membrane “bounce.”
-Movement of the basilar membrane causes distortion of stereocilia.
-Movement of fluid through the helicotrema causes a response to sound vibrations.
-Sound waves cause pressure waves in the fluid in the inner ear, making the basilar membrane “bounce.”
-Movement of the basilar membrane causes distortion of stereocilia.
Detect odors
Olfactory Receptor Cells
Replace olfactory components
Basal Cells
Sustain olfactory neurons
Supporting Cells
In anterior cavity; resembles CSF
Aqueous Humor
In posterior cavity; gelatinous gel
Vitreous Humor
Check all that are true regarding the anatomy and physiology of the sense of equilibrium.
-Otoliths are small calcium carbonate crystals that are embedded within a gelatinous layer.
-Otoliths and the gelatinous layer form the otolithic membrane.
-When the head is held erect, the otolithic membrane appllies pressure directly on the hair cells.
-When the head is tilted, the hair cells remain erect, but there is a change in neurotransmitter release.
-Otoliths and the gelatinous layer form the otolithic membrane.
-When the head is held erect, the otolithic membrane appllies pressure directly on the hair cells.
Gustatory cells are housed in special sensory organs termed
Taste buds
Stimuli from joints and skeletal muscles
Proprioceptors
Stimuli from body organs
Interoreceptors
Stimuli from environment
Exteroreceptors
Of the six groups of sensory receptors classified by the modality of stimulus, the ones located in the eye that detect changes in light intensity, color, and movement are the _______________.
Photoreceptors
Put the events of sound wave movement through the ear and nervous pathways in order.
1. The vestibular membrane begins to vibrate.
2. Sound waves make the tympanic membrane vibrate.
3. A pressure wave in the endolymph of the cochlear duct displaces a specific region of the basilar membrane.
4. Sound waves are amplified due to movement by the auditory ossicles.
5. The cochlear branch of CN VIII is stimulated.
6. Hair cells in the spiral organ are distorted.
7. Pressure waves are generated within the oval window and travel through the scala vestibuli.
2-4-7-1-3-6-5
Innermost cells in the neural layer
ganglion cells
