1- topography of nervous system Flashcards
what are the highlighted sections and their purpose
purple- cingulate gyrus. emotion and memory
red- corpus callosum. fibres connecting two cerebral hemispheres
green- thalamus. sensory relay station projecting to sensory cortex
blue- hypothalamus. homeostasis
yellow- fornix. output pathway from hippocampus
brown- tectum. dorsal part of midbrain involved in involuntary responses to auditory and visual stimuli
cerebellar tonsils- cerebellum that can herniate and compress the medulla
highlighted sections and functions
yellow- parahuppocampal gyrus. key cortical region for memory encoding.
red- optic chiasm. where visual fibres cross over
green- uncus. part of temporal lobe that can herniate, compressing the midbrain
blue- medullary pyramids. location of descending motor fibres.
blue- post central gyrus. primary sensory cortex
purple- lateral fissure. seperates temporal from frontal and parietal lobes
red- central sulcus. frontal and parietal lobes
yellow- parietoocipital sulcus. seperates parietal and occipital lobes
green- precentral gyrus. primary motor cortex
what does sensory defect in dermatomal pattern suggest
lesion at level of dorsal roots or spinal nerves
what does sensory deficit in multiple segments suggest
cord lesion
what does sensory defect in homuncular pattern suggest
lesion above thalamus
what do central peduncles contain
MIDBRAIN
contain descending corticospinal fibres from the ipsilateral hemisphere
what do Substantia nigra (grey matter) contain
MIDBRAIN
contains dopaminergic neurones that project to the striatum (nigrostriatal fibres)
what is the red nucleus
MIDBRAIN
a well distinct region that gives rise to axons that travel to the cord in the vestigial rubrospinal tract. It also has some other less important motor functions
what is the oculomotor nucleus
MIDBRAIN
contains lower motor neurone cell bodies that project through the oculomotor nerve to all bar two of the extraocular muscles
what is the edinger westphal nucleus
MIDBRAIN
contains parasympathetic preganglionic neurones that project to the ciliary ganglion in the orbit to cause pupillary constriction
what is Periaqueductal grey matter
MIDBRAIN
an area surrounding the cerebral aqueduct that has roles in pain transmission and micturition
what is the cerebral aqueduct
MIDBRAIN
connects the third ventricle (found between the halves of the thalamus) and the further ventricle (found beneath the cerebellum)
what does the Superior/inferior colliculus do
MIDBRAIN
regulate reflex responses to visual and auditory stimuli respectively
