Unit 2: Exteroception Flashcards
L1: Somatosensory Area ___ receives information from somatosensory Area __.
2; 1
L1: The second synapse for fibers in the medial lemniscal system occurs in the _____.
VPL thalamus
L1: Transducin activates a _______ to degrade _____ and close cation channels.
PDE; cGMP
L2: _____-adapting fibers sense steady touch.
Slowly
L2: _____-adapting fibers sense vibration.
Rapidly
L2: Auditory information is relayed through the _____ in the thalamus
Medial Geniculate Nucleus
L2: Brodmann’s Area 1 and 2 contain fibers that are sensitive to _______.
Direction and orientation
L2: Brodmann’s Area 2 fibers are distinctive in that they are _____-sensitive.
Shape
L2: Brodmann’s Area 3a contains fibers from _______.
Muscle stretch receptors (proprioception)
L2: Brodmann’s Area 3b contains fibers from ______.
Cutaneous receptors
L2: In long receptor cells, stimulus intensity changes the ______.
frequency of action potentials
L2: In rod cells, a conformational change in 1-retinal causes ______ to be converted to _______, which activates the G protein _________.
Rhodopsin; metarhodopsin; Transducin
L2: In rod cells, photons cause a conformation change in ______.
1-retinal
L2: In short receptor cells, stimulus intensity changes the _______.
receptor potential
L2: Layer __ of the cortex projects to other areas of the somatosensory cortex.
I and II
L2: Layer __ of the cortex projects to other subcortical areas
V
L2: Layer __ of the cortex projects to the thalamus.
VI
L2: Layer __ of the cortex receives input from the thalamus
IV
L2: Meissner’s corpuscles are ______-adapting with a ______ receptive field.
rapidly; small
L2: Merkel’s disks are ______-adapting with a ______ receptive field.
slowly; small
L2: Olfactory information is relayed through the _____ in the thalamus
Not relayed through the thalamus
L2: Pacinian corpuscles are ______-adapting with a ______ receptive field.
rapidly; large
L2: Ruffini endings are ______-adapting with a ______ receptive field.
slowly; large
L2: The fibers from the trigeminal lemniscal system join fibers from the medial lemniscal system in the ______.
Medial lemniscus
L2: The first synapse for fibers in the medial lemniscal system occurs in the ______.
caudal medulla
L2: The first synapse for fibers in the trigeminal lemniscal system occurs in the _____.
Principal nucleus
L2: The second synapse for fibers in the trigeminal lemniscal system occurs in the ______.
VPM thalamus
L2: Visual information is relayed through the ______ in the thalamus
Lateral Geniculate Nucelus
L2: What skin receptor is rapidly-adpating and has a large receptive field?
Pacinian Corpuscles
L2: What skin receptor is rapidly-adpating and has a small receptive field?
Meissner’s Corpuscles
L2: What skin receptor is slowly-adpating and has a large receptive field?
Ruffini Endings
L2: What skin receptor is slowly-adpating and has a small receptive field?
Merkel’s disks
L2: Which skin receptors are rapidly-adapting?
Meissner’s Corpuscles, Pacinian Corpuscles
L2: Which skin receptors are slowly-adapting?
Merkel’s disks, Ruffini Endings
L2: Which skin receptors have large receptive fields?
Pacinian Corpuscles, Ruffini Endings
L2: Which skin receptors have small receptive fields?
Meissner’s Corpuscles, Merkel’s disks
L2: Which types of fibers (A, C, etc.) are found in the medial lemniscal system?
A-alpha, A-beta
L3: What type of sensory information is transmitted by A-alpha fibers?
Muscle/tendon afferent
L3: What type of sensory information is transmitted by A-beta fibers?
secondary muscle afferents, skin mechanoreceptors
L3: What type of sensory information is transmitted by A-delta fibers?
Sharp pain, cold temperature
L3: What type of sensory information is transmitted by C fibers?
Warm temperature, burning pain, itch, crude touch
