Cortex & Thalamus Wk2 Flashcards
Identify the cerebral hemispheres
Lobes: temporal, parietal, occipital and prefrontal
Sulcus: Lateral and central
Differentiate between grey matter and white matter
Gray matter = cell bodies
White matter = axon fibre tracts
Gray matter consists of
basal ganglia and cerebral cortex
Corpus callosum is the
horizontal band of white fibre
Why is corpus callosum important?
Communication - this fibre tract connects 2 cerebral hemispheres
(Commissure)
Association fibres are
fibres that interconnect cortical regions of same hemisphere. e.g. arcuate and longitudinal fasciculi
Projection Fibres
Projection fibres run from cerebral cortex to areas beyond the hemispheres.e.g. corticospinal.
In the left hemisphere what function do we have
Language (sounds, & speech
production), writing, maths, logical thinking skills
Right hemisphere has what functions?
Spatial perception, musical skills, identification of familiar objects (by touch, smell, sight, taste or feel).
Gustatory cortex is located in?
Insula; Chemoreceptors of the tongue respond to Stimuli, where it is transmitted to brainstem then thalamus. Then it produces a Signal to gustatory cortex (insula)
Auditory cortex projects to?
The temporal lobe = Sound activates hair cells in cochlea, Signal to thalamus (medial geniculate nucleus; MGN), Signal transmitted to auditory cortex (temporal lobe)
Anterior part of the thalamus:
Anterior: limbic system, emotion, recent memory
Medial part of the thalamus
Medial (dorsomedial nucleus): mood, emotions
Lateral part of the thalamus
Lateral: specific thalamic nuclei (sensory and motor relay)
Explain the visual projection to our visual cortex.
Light activates photoreceptors in retina
Signal via optic nerve to thalamus (lateral geniculate nucleus; LGN)
Thalamus to visual cortex (occipital lobe)
