Flashcards in CNS Part 3 Deck (62)
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1
Special senses vs somatosensory differences in receptors
Special- high density of receptors in target organ, discrete travel and bundle processing
Somatosensory- diffuse pattern, covers a large field
2
Same second messengers can have __ responses based on cell
Different
3
Sensory receptors transduce enviro changes into electronic signals. Connect to __ __ neurons which relay info via __ __ to brain and spinal cord. __ __ neuron cell bodies housed in __ __ and __ __ __
Primary afferrent
Action potentials
Primary afferrent, dorsal root, cranial nerve ganglia
4
Cranial nerve ganglia have a __ process that extends dismally within a __ __ to sensory receptors, and a __ __ that enters the spinal cord or brain through a __ __ or __ __
Peripheral, peripheral nerve
Central process, dorsal root or cranial nerve
5
Each __ __ __ has a specific cutaneous field
T4 Dermatome innervated by
DRG
T4 DRG
6
Exteroceptive info: interaction of __ with the __
2 types
Skin, enviro
Fine discriminatory touch and pain/temp
7
Fine discrim touch powered by 2
Pain and temp powered by 2
A alpha and a beta
A delta and c (fast and slow pain )
8
Proprioceptive info: body and limb position informing ___
Receptors in __, __, and __
Movement
Joints, muscles, tendons
9
Enteroceptive info: __ __ of the body. Ex __ in __ or __
Internal status
Stretch, bladder, gut
10
One thing all sensory receptors (thermal, chemical, pain, etc) is stimuli causes what
Changing membrane permeability to get action potential
11
Receptor potentials can change by 5
Mechanical, chemical, temp, electromagnetic radiation, pain
12
Process same for all receptor potentials when get to what level
Action potential
13
Sensory receptors will adapt either __ or __ to __ stimulation by a variety of mechanisms
Partially or completely, constant
14
Mechanosensitive afferrent fibers __ __ __ or __ __
Tactile fibers fast
Slow adaptation
15
Type I mechanoreceptive afferrent fibers have __ receptive field. Higher density of these fibers leads to better __ __ discrimination
Type II fibers have a ___ receptive field
Small, two point
Large
16
If a pin pricks finger what would type I vs type II tell you
Type I- exactly where prick is
II- something stabbing your finger but can't tell where
17
Fast adapting: get message __ at first and stop __ with time
Slow adapting is ___
Loudly, firing
Opposite
18
What kind of fibers are:
Meisner corpuscles
Pacinian corpuscles
Fast adapting 1
Fast adapting 2
19
What kind of fibers are merkels disks and ruffini endings
Slow adapting 1 and slow adapting 2`
20
More receptors leads to a ___ image
Clearer
21
Receptor potential vs stimulus intensity is a ___ patterned chart because can't sense change above ___
Curved not linear
100%
22
Spatial location: __ of neurons within a __ __
Population, receptive feel
23
Stimulus intensity: frequency of __, __ of sensory receptors involved
Action potential, number
24
Stimulus frequency: ___ interval
Inter stimulus
25
Each nerve tract ___ at a specific point in the CNS and carries a selective sensory modality. (Pain and mechanoreceptors not carried by same tract)
Terminates
26
Sensation is perceived when a specific stimulated __ leads to specific __ in the CNS. Ex separate dedicated cell populations in __ and __ __
Nerve, areas
Thalamus, somatosensory cortex
27
Alteration of the specific nerve tracts activity will only change the __ of the stimulus (___) vs changing the __ of stimulus perceived (__)
Intensity, quantitative, type, qualitative
28
Dorsal column medial leminiscal
1. Highly __ touch
2. __ sensations (__ gradation of intensity)
3. __ sensations (__)
4. __ contact sensation
5. __ position
6. __ sensations
1. Localized
2. Touch, fine
3. Phasic, vibratory
4. Skin
5. Joint
6. Pressure
29
DCML
Composed of __ __ fibers transmitting signals at __-__m/sec
__ spatial orientation
Large myelinated, 30-110, more
30
