Hypothalamus Flashcards
energy expending mechanisms
Caudolateral- Sympathetic effector areas
conservation of energy
Rostromedial- Parasympathetic areas
energy expending mechanisms
Caudolateral- Sympathetic effector areas
two primary neurosecretory mechanisms
- Tuberoinfundibular system
- Supraopticohypophysial system
neurons that produce releasing factors that cause the release of hormones from the anterior pituitary
Tuberoinfundibular system
neurons release neurohormones directly into the bloodstream
Supraopticohypophysial system
lesion in the Supraopticohypophysial system results in
diabetes insipidus
lies lateral to the column of the fornix and mammillothalamic tract
Lateral hypothalamic zone
the medial forebrain bundle (MFB) carries what
autonomic information
lateral hypothalamic nuclear zone is important in that its neurons broadly comprise of
the feeding center
involved in the incorporation of short term memory into long term memory as part of the circuit of Papez
Mammillary Region
descending projections are particularly important in the regulation of autonomic reflexes
Communication: hypothalamic connections
primary memory circuit
Papez’s Circuit
autonomic “coloring” of memory seems to come from pathways outside of this primary one
Papez’s Circuit
what tract controls parasympathetic control afferents
Hypothalamospinal tracts
continue through the medulla to the spinal cord to the intermediolateral cell column (sympathetic control) and sacral parasympathetic nuclei
hypothalamomedullary tracts
kidneys will trigger the release
angiotensin II in the blood
has intrinsic receptors on temperature sensing neurons near the lamina terminalis
Temperature regulation
temperature sensors stimulate the caudal hypothalamus that then stimulates:
- heat conservation
- heat production
- cutaneous vasoconstriction
- caudolateral group
heat conservation
- Shivering
- mediated by reticulospinal pathways
heat production
Hypothalamic nuclei helps with what
Circadian rhythms/sleep-wake cycles
direct and retinal projections, and appears to control circadian rhythm activities as one primary sensory arm
suprachiasmatic nucleus
is released by adipocytes and acts directly on the hypothalamus
Leptin
