Tactile mechanoreceptors can be slowly adapting which respond to __ stimuli
Tactile mechanoreceptors can be rapidly adapting whuch respond to ___ stimuli
the onset of
which receptors have encapsulated endings?
ruffinis and meissners
___ rceptors respond really quickly
describes merkel receptors signals
have an initially strong signal that partially adapts + a weaker signal of slower adaptation
___ and ___ are slow adapting receptors
merkels and ruffinis (sounds like old peoples names.. so slow)
___ and ___ are rapdi adapting receptors
pacianian and meissers
____ have lamina with gelatinous, rapidly dissipating fluid in between the layers
Two point discrimination is a good measure of ___-
High tactile sensibility = Fine spatial discrimination = ____ receptor density
High receptor density = ____ receptive fields
Areas of greatest sensitivity (highest receptor density) are the (3)
hand, face, and foot
receptor with best spatial resolution?
receptor with best temporal resolution?
Meissner (RA) & Pacinian (RA)
where do the DML and ALS pathways enter the SC?
via dorsal root ganglion --> lateral margin of the dorsal columns
Medial branch = ____ tract to brain
Lateral branch = ____ tract to brain
Sensory nerves are segregated by ___ and ___ within the dorsal columns of the spinal cord.
receptor type and modality
In addition to segregation by receptor type and modality, there is Somatopic organization in dorsal columns of spinal cord. what is most medial? most lateral?
lower limb -- most medial head and neck -- most lateral
Dorsal Column Nuclei are the
gracile and cuneate nuclei
Spatial Summation: In the Dorsal Column Nuclei
neurons converge onto 2nd order neurons with____ that have both excitatory and inhibitory regions.
larger receptive fields
in the thalamus
Moving medial-lateral changes ___
in the thalamus
moving anterior-posterior changes ___
S1 has 4 cytoarchitectonic regions: ___
3a, 3b, 1, and 2.
Fibers from areas 3a and 3b go to areas ___
1 and 2
Each of the 4 areas of S1 has its own independent, complete, ___
parallel sensory map.
ptimary submodality of 3a
deep tissue input
primary submodality of 3b
cutaneous receptors, SA or RA
primary submodality of 1
cutaneous receptors, ra
primary submodality of 2