Somesthesis Lec14 Flashcards Preview

Neuroscience > Somesthesis Lec14 > Flashcards

Flashcards in Somesthesis Lec14 Deck (59)
Loading flashcards...
1

Tactile mechanoreceptors can be slowly adapting which respond to __ stimuli

enduring

2

Tactile mechanoreceptors can be rapidly adapting whuch respond to ___ stimuli

the onset of

3

which receptors have encapsulated endings?

ruffinis and meissners

4

___ rceptors respond really quickly

pacicinian

5

describes merkel receptors signals

have an initially strong signal that partially adapts + a weaker signal of slower adaptation

6

___ and ___ are slow adapting receptors

merkels and ruffinis (sounds like old peoples names.. so slow)

7

___ and ___ are rapdi adapting receptors

pacianian and meissers

8

____ have lamina with gelatinous, rapidly dissipating fluid in between the layers

pacinian

9

Two point discrimination is a good measure of ___-

receptor sensitivity

10

High tactile sensibility = Fine spatial discrimination = ____ receptor density

High

11

High receptor density = ____ receptive fields

Small

12

Areas of greatest sensitivity (highest receptor density) are the (3)

hand, face, and foot

13

receptor with best spatial resolution?

merkels

14

receptor with best temporal resolution?

Meissner (RA) & Pacinian (RA)

15

where do the DML and ALS pathways enter the SC?

via dorsal root ganglion --> lateral margin of the dorsal columns

16

Medial branch = ____ tract to brain

Dorsal Column

17

Lateral branch = ____ tract to brain

Anterolateral

18

Sensory nerves are segregated by ___ and ___ within the dorsal columns of the spinal cord.

receptor type and modality

19

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

20

Dorsal Column Nuclei are the

gracile and cuneate nuclei

21

Spatial Summation: In the Dorsal Column Nuclei

neurons converge onto 2nd order neurons with____ that have both excitatory and inhibitory regions.

 larger receptive fields

22

in the thalamus 

Moving medial-lateral changes ___

place

23

in the thalamus

moving anterior-posterior changes ___

modality

24

S1 has 4 cytoarchitectonic regions: ___

3a, 3b, 1, and 2.

25

Fibers from areas 3a and 3b go to areas ___

1 and 2

26

Each of the 4 areas of S1 has its own independent, complete, ___

parallel sensory map.

27

ptimary submodality of 3a

deep tissue input 

28

primary submodality of 3b

cutaneous receptors, SA or RA

29

primary submodality of 1

cutaneous receptors, ra

30

primary submodality of 2

deep pressure