Bell Work 4/25/11 . Identify the special senses A: Smell, Taste, Hearing, Vision, Balance. Somatic and Special Senses. Chapter 12. Types of Senses.
Identify the special senses
A: Smell, Taste, Hearing, Vision, Balance
3. Nerve impulses must be conducted along a neural pathway from the sensory receptor to the brain.
4. A region of the brain must receive and integrate the nerve impulses into a sensation.
Complete checkpoints 1-5
Which receptors are especially abundant in the fingertips, palms and soles?
A: Corpuscles of touch
(Meissner corpuscles) are abundant in the fingertips, palms and soles.
Which visceral organ has the broadest area for referred pain?
What is the function of basal stem cells
A: Basal stem cells undergo cell division to produce new olfactory receptors.
Sense of Smell
In order from the tongue to the brain, what structures form the gustatory pathway.
A: gustatory receptor cells-> cranial nerves VII, IX, and X -> medulla oblongata
-> thalamus ->primary gustatory area in the parietal lobe of the cerebral cortex.
What are the components of the fibrous and vascular tunic.
A: fibrous tunic consists of the cornea & sclera, vascular tunic consists of choroid, cilliary body and lens.
What is presbyopia?
A: Loss of elasticity in
the lens that occurs w/age
Where are the receptors for hearing and equilibrium located?
A: Inner ear, cochlea (hearing) and semicircular ducts (equilibrium)
Hearing Assistive Devices
5. Movement of the oval window sets up fluid pressure waves in the perilymph of the cochlea.
6. The fluid pressure waves are transmitted from the scalavestibuli to the scala tympani and eventually to the membrane covering the round window causing it to bulge into the middle ear.
7. As the pressure waves deform the walls of the scalavesstibuli and scala tympani they also push the vestibular membrane back and forth creating pressure waves in the endolymph inside the cochlear duct.
8. Pressure waves in the endolymph cause basalar membrane to vibrate which moves the hair cells of the spiral organ against tectorial membrane. Bending of the hairs stimulates the release of neurotransmitters to part of the vestibular nerve.