Anatomy 4.5 Flashcards
Anatomically what is the limbic system?
border between the diencephalon and telencephalon; conscious and unconscious regions
What are the regions of the limbic system?
1) cingulate gyrus (limbic lobe)
2) parahippocampal gyrus (limbic lobe; houses hippocampal formation and amygdala)
3) medial orbital gyrus (frontal lobe)
4) gyri of temporal lobe
What are the main functions of the limbic system?
1) emotional response to smell
2) memory
3) sexual drive
What are the key functional centers of the limbic system?
1) hippocampus
2) amygdala
3) lateral septal nuclei (basal nucleus of Meynert)
Which structures make up the limbic lobe?
1) cingulate gyrus
2) septal area
3) parahippocampal gyrus
What is the principal effector target of the limbic system?
hypothalamus; regulates homeostasis (connected to ANS)
Where does the hypothalamus receive input from?
- most of body
- olfaction
- viscera
- retina
Which structure separates the two sides of the hypothalamus?
third ventricle
What is the clinical presentation of destruction to the lateral aspect of the hypothalamus?
aphagia (no eating)
adipsia (no drinking)
What is the clinical presentation of destruction to the medial aspect of the hypothalamus?
hyperphagia (excess eating)
hyperdipsia (excess drinking)
Which part of the hypothalamus is responsible for the memory circuit?
mammilary bodies
Which part of the hypothalamus is responsible for autonomic responses?
posterior nucleus
What is the function of the amygdala?
fear conditioning**
memory consolidation
Which structure programs the response to not laugh at a funeral?
amygdala
What is Kluver-Bucy Syndrome?
- hypersexualized
- loss of affect/aggression
- “psychic blindness” aka visual agnosia
- loss of fear
