Diencephalon Flashcards
describe the corpus callosum
it is a a flat band of white matter that connects the left and right cerebral hemispheres.
Commisural fibres run within the corpus callosum and allow communication between the hemispheres.
Describe the septum pellucidum
a thin sheet like structure that divides the lateral ventricles. Spans from corpus callosum above to fornix below.
Describe Thalamus
Is a structure that relays sensory and motor nuclei to the cerebral cortex.
describe the hypothalmic sulcus
a groove that demarcates the thalamus from the hypothalamus
describe the hypothalamus
a collection of nuclei that have control over aspects of the autonomic nervous system, metabolic processes, body temp ect.
The OPTIC chiasma, PITUITARY stalk and MAMMILLARY bodies are all attached to the hypothalamus
Describe the optic chiasma
it is attached to the hypothalamus.
gives rise to optic nerves which pass through optic canal in skull to provide sensory innervation to the eye.
what is the interventricular foramen?
a passage that allows CSF to flow between the lateral and 3rd ventricle
describe the pituitary stalk
connects the pituitary gland and the hypothalamus.
Where is the primary motor cortex?
pre central gryus
where is the primary somatosensory cortex?
post central gyrus
where is the visual cortex?
Occipital lobe - on the gyri of the CALACRINE sulcus
where is the auditory cortex?
Superior temporal gyrus
Describe ASSOCIATION fibres
- allow communication between gyrus on SAME cerebral hemisphere.
describe COMMISURAL fibres
- allow communication between DIFFERENT hemispheres.
e. g. corpus callosum
describe PROJECTION fibres
- allow communication between the the lower parts of the brain / spinal cord and the cortex. (SAME side)
e. g. internal capsule
