Miscellaneous Flashcards
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
explain ruffini’s endings?
nerve terminal intertwined with collagen fibres
located deep in the dermis
detects identation, stretch and lateral movements of the skin
explain meissner’s corpuscles?
looping axonal terminal intertwined with supporting cells
located just below the epidermis
detects 30-50Hz
detects rough texture and movements
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
what are phased neurons ?
fire a burst of activity and then shut down
what are tonic neurons?
fire constantly
what are accommodating neurons ?
initially fire rapidly but then get slower and slower until the stop firing
what are spontaneous active bursting neurons?
pacemaker neurons which dont require external stimulus
oscillate without external input and shut down automatically
what is the affective aggression pathway of serotonin?
basolateral nuclei of the amygdala
to lateral hypothalamus
to PAG
what is the predatory aggression pathway of serotonin?
corticomedial nuclei of the amygdala
to lateral hypothalamus
to ventral tegmentum
what does the utricle detect ?
linear acceleration
what happens when the otolithic membrane moves?
activates the utricle and saccule
what happens to movements when the activity in the direct pathway in the basal ganglia is increased ?
increases likelihood of movement
what happens to movements when the indirect pathway is activated in the basal ganglia?
decreases likelihood of movements
what happens when dopamine is released in the striatum ?
increases movement
activates the direct pathway and inhibits the indirect pathway