Miscellaneous Flashcards Preview

Neurobiology > Miscellaneous > Flashcards

Flashcards in Miscellaneous Deck (22):
0

explain ruffini's endings?

nerve terminal intertwined with collagen fibres
located deep in the dermis
detects identation, stretch and lateral movements of the skin

1

explain merkel's disks?

dome structure on top of an axon terminal
located in the epidermis/dermis boundary
detects shape, form, texture and rough edges

2

explain meissner's corpuscles?

looping axonal terminal intertwined with supporting cells
located just below the epidermis
detects 30-50Hz
detects rough texture and movements

3

explain pacinian's corpuscles?

sensory axon surrounded by fluid filled capsules
located deep in the dermis
detects vibrations of 250-350Hz
detects fine texture and movements

4

what are phased neurons ?

fire a burst of activity and then shut down

5

what are tonic neurons?

fire constantly

6

what are accommodating neurons ?

initially fire rapidly but then get slower and slower until the stop firing

7

what are spontaneous active bursting neurons?

pacemaker neurons which dont require external stimulus
oscillate without external input and shut down automatically

8

what is the affective aggression pathway of serotonin?

basolateral nuclei of the amygdala
to lateral hypothalamus
to PAG

9

what is the predatory aggression pathway of serotonin?

corticomedial nuclei of the amygdala
to lateral hypothalamus
to ventral tegmentum

10

what does the utricle detect ?

linear acceleration

11

what happens when the otolithic membrane moves?

activates the utricle and saccule

12

what happens to movements when the activity in the direct pathway in the basal ganglia is increased ?

increases likelihood of movement

13

what happens to movements when the indirect pathway is activated in the basal ganglia?

decreases likelihood of movements

14

what happens when dopamine is released in the striatum ?

increases movement
activates the direct pathway and inhibits the indirect pathway

15

what happens when the VA/VL nuclei of the thalamus are activated ?

it increases movement

16

what are thee 5 cell types in the cerebellar cortex ?

purkinje cells
granule cells
golgi cells
basket cells
stellate cells

17

what cells of the cerebellar cortex actually leave the cerebellum ?

purkinje cells are the only ones that have axons to leave the cortex

18

what cells of the cerebellar cortex are excitatory ?

only the granule cells

19

what cells of the cerebellar cortex dont interact with the purkinje cells ?

only the golgi cells

20

what are the parallel fibres ?

axons of the granule cells

21

explain the pyramidal tract/corticospinal tract?

passes through internal capsule
decussates within the medullary pyramids
has the majority of axons in the lateral portion
axons which dont decussate travel in the anterior portion