The Amygdala Flashcards
where is the amygdala
anterior MTL
what is the basolateral complex of the amyg
BLC - lat nucleus (main input) and magnocellular
sensory input and processing:
recieves feedback projections from cortical/sensory regions
multimodal convergence of cotically processed and current (in the moment/immediate) info
what is the central nucleus
ce
region above BLC and ICMs for autonomic and somatomotor output via hypothall, brainstem and neuromodulation centres in cortex
what are the intercallated masses
ICMs between BLC and Ce permit habituation of responsivity - inhibitory barrier recognition of potential threat without overt response ie where context recog it is unnecessary
amyg distinction in humans/animals
dorsal ventral distinction less meaningful in nonhuman/nonprimates
what is the BNST/SLEA
bed nucleus of the striata terminalis :
recieves input from Ce as primary source of acetylcholine for whole cortex
comprised of SLEA neurons (sublenticular extended amyg neurons) which are extensions of the ce and me
extend towards NAcc
what does acetylcholine do in the amyg
in the BNST
source for whole of cortext
potentiate neural responsivity by lowering thresholds
facilitates cortical processing - allows to become more efficient at processing environ for orienting and defense responses to
where does the ce extend to
extends into the substantia innominata (SI) region within the immediately superior and adjacent ventral basal forebrain.
what is the substantia inominata
si
comprises numerous intermingled neuronal groups including sublenticular extended amygdala neurons (SLEA) (Congregated in BNST) that represent an extension of the Ce and Me
dorsal ventral distinction of amyg
Dorsal
Ce, Me
ventral:
BLC and cortical nucleus (Co)
BLC = lat nucleus + basal nuclei
represents the significance of these stimuli’s potential or future importance.
related to the detection and discrimination of presented stimuli based upon their past predictive nature
