Touch, Pain, Smell, Taste Flashcards
Glabrous skin is located on the:
palms, soles, lips
Encapsulate mechanoreceptors include _____ and _____ ______
Meissner’s, Pacinian corpuscles
Nonencapsulated mechanoreceptors include _____ ____ and _____ _____
Merkel’s disks and Ruffini’s endings
A ____ ____ _____ test for tactile agnosia helps identify sensitivity levels in various extremeties
two point discrimination
Mechanoreceptors have ____ ____ ____ which means they have no specialized structure and are just unmyelinated nerve endings of sensory neurons
free nerve endings
The _____ mechanoreceptors (meissner’s and pacinian) rate of adaption is ____
encapsulated, rapid
______ _____ and _____ ____ have small receptor field sizes and sense ______
meissner’s corpuscles, merkle’s disks, pressure
Pacinian corpuscles are _____ and sense _____
large, vibration
Ruffini’s endings are _____ and sense ______
large, stretch
_____-_____ sensory axons are the largest and fastest and receive feedback from ______
alpha-alpha, muscles
_____-_____ are the second largest and fastest and receive info from _________
alpha-beta, mechanoreceptors
_____-_____ are fast pain and temperature axons
alpha-delta
_ ____ are dull pain and temperature axons
C fibers
_______ are areas of the skin served by the dorsal root of ____ spinal nerve
dermatomes, one
____ is a virus that affects a single dorsal root and produces skin eruptions that follow one half of a dermatome band
shingles
The ____-_____ Law states that ____ root celll bodies are in the ____ root ganglion outside of the spinal cord and the ____ root cell bodies are in the ____ part of the spinal cord
Bell Magendie, dorsal, dorsal, ventral, ventral
Ventral root cells are _____ in nature and stimulation of these nerves cause ____ ______
motor, muscle contraction
Signals from mechanoreceptors travel skin along __ axons to ___ ___ of the spinal cord via ______
alpha beta, dorsal roots, dermatomes
From the spinal cord, axons travel along the ____ ____-____ ____ pathway to the _____ ____ of the _____
dorsal column- medial lemniscal, dorsal column nuclei, medulla
Axons from the dorsal column nuclei cross the _____ to the ______ _____ ______ nucleus of the thalamus, then project to the _______ _______ ______
midline, contralateral ventral posterior, primary somatosensory cortex
Touch information from the _____ travels to the VP nucleus via the cranial nerves
head
Somatosensory infomaion is processed by the _____ ____ and _________ nuclei of the _______
ventral posterior, intralaminar, thalamus
The _____ ______ maps relative representation of bod parts in the somatosensory cortex
sensory homunculus