Flashcards in Diencephalon Deck (21)
Develops from prosencephalon
Sensory and motor processing. .
Extends from brain stem to cerebrum, surrounds 3rd ventricle.
Paired oval masses of grey matter organized in nuclei with interspersed tracts of white matter.
Relays almost all sensory input to cerebral cortex.
Also involved in motor function and maintenance of consciousness
Inter thalamus adhesion
Bridge of grey matter the joins right and left hemispheres of thalamus
(In about 70% of population)
Divides grey matter in each half of the thalamus.
Axons entering and leaving thalamus nuclei.
Thick band of white matter in lateral thalamus
Axons connecting thalamus to cerebral cortex pass through.
Ventral posterior nucleus
Relays impulses for somatic sensations like touch, pressure, vibration, itch, tickle, temperature, pain, proprioception
Lateral geniculate nucleus
Relays visual impulses for sight from retina to primary visual area of cerebral cortex.
Medial geniculate nucleus
Relays auditory impulses from hearing from ear to primary auditory area of cerebral cortex
Small part of diencephalon.
Inferior to thalamus.
One of the main regulator of homeostasis
4 regions: mammillary, tuberal, supraoptic, preoptic
Most posterior region of hypothalamus
Adjacent to midbrain
Contains mammillary bodies (relay stations for reflexes associated with smell) and posterior hypothalamic nuclei
Widest portion of hypothalamus.
Contains dorsomedial, ventromedial, and arcuate nuclei.
Also contains infundibulum and median eminence.
Connects pituitary gland to hypothalamus
Encircled by median eminence
Superior to optic chiasm.
Contains paraventricular, supraoptic, anterior hypothalamic and suprachiasmatic nuclei
In supraoptic region of the hypothalamus.
Involved in circadian rhythm.
Hypothalamus; anterior to supraoptic region.
Regulates some autonomic areas
Contains medial and lateral preoptic nuclei
Functions of Hypothalamus
Control of ANS
Production of hormones
Regulates emotional and behavioural patterns
Regulates eating and drinking (feeding, satiety, thirst)
Control of body temperature
Regulates circadian rhythm
Hypothalamus: role in hormone production
Cooperates with pituitary gland.
1. Release releasing and inhibiting hormones that act on anterior pituitary hormones.
2. Axons from paraventricular and supraoptic nuclei act on posterior pituitary (through infundibulum) to release oxytocin and antidiuretic hormone (vasopressin).
Pineal gland + habenular nuclei
Involved in olfaction, especially emotional response to olfactory stimulation