Review Flashcards
What are the permeabilities of potassium, sodium, and chlorine at resting membrane potential?
K+ : Na+ : Cl- ~ 10 : 0.4 : 4.5
What are the two ways to speed up axonal conduction velocity?
- Increase the diameter of the axon
- Myelinate the axonal membrane
What are the three steps in sensory perception?
What is topographic sensory cortex organization?
sensory areas of cerebral cortex have maps in which the sensory surface is laid out topographically onto the brain
What is columnar in our organization of the sensory cortex?
sensory cortex contains columns which represent a single modality (pain vs. touch; direction vs orientation).
What is parallel processing?
many sensory submodalities are organized in parallel. e.g. there are distinct lateral line pathways for each modality (e.g. form vs movement, touch vs. pain).
What is meant by primary to Association In the sensory cortex?
information is processed from primary sensory to secondary association to multimodal sensory association cortex.
What is the skin stimulus and perceptual function of hair follicles?
Light brush, skin movement
What is the skin stimulus and perceptual function of Meissner corpuscles?
Dynamic deformation, skin motions; detecting slipping objects
What is the skin stimulus and perceptual function of Pacinian corpuscles?
Vibration, Vibratory cues transmitted by body contact when grasping an object
What is the skin stimulus and perceptual function of Merkel cells?
Indention depth, find tactile discrimination form and texture perception (braille)
What is the skin stimulus and perceptual function of C-fiber LMTs?
Touch. Skin stretch; direction of object motion, hand shape and finger position
What is the skin stimulus and perceptual function of Ruffini corpuscles?
Stretch. Skin stretch; direction of object motion, hand shape and finger position
What is the skin stimulus and perceptual function of Mechanical nociceptors and polymodal nociceptors?
Injuries forces. Skin injury; pain
