1. Intro And Recap Flashcards
What is grey matter composed of?
Cell bodies and dendrites. Is highly vascular.
What is white matter composed of?
Axons and myelin.
What is the PNS equivalent of grey matter and white matter?
Grey - ganglion.
White - peripheral nerve.
What is a funiculus in the spinal cord and in what direction do impulses travel?
A segment of whit matter containing multiple distinct tracts. Impulses travel in multiple directions?
What is a tract in the spinal cord and in what direction do impulses travel?
An anatomically and functionally defined white matter pathway connecting two distinct regions of grey matter. Impulses travel in one direction.
What is a fasciculus in the spinal cord?
A subdivision of a tract supplying a distinct region of the body.
What is Rexed’s laminae?
The organisation of grey matter in the spinal cord into cell columns. The motor neurones supplying a given muscle arise from multiple segments and form a distinct population of neurone in the CNS, a nucleus.
What is a nucleus in the CNS?
A collection of functionally related cell bodies in grey matter.
What is the cortex in the CNS?
The folded sheet of cell bodies found on the surface of the brain. Is grey matter.
What is a fibre in the CNS?
An axon in association with its supporting cells eg oligodendrocytes. Is found in white matter and used synonymously with axon.
What are association fibres?
Fibres which connect cortical regions within the same hemisphere of the brain.
What are commissural fibres?
Fibres which connect the left and right hemispheres or cord halves.
What are projection fibres?
Fibres which connect the cerebral hemispheres with the cord/brainstem and viva versa.
What is the function of the midbrain?
Eye movements and reflex responses to sound and vision.
What is the function of the pons?
Feeding and sleeping.
What is the function of the medulla?
Cardiovascular and respiratory centres. Contains a major motor pathway, the medullary pyramids.
What does the precentral gyrus of the brain contain?
The primary motor cortex.
What does the postcentral gyrus of the brain contain?
The primary sensory cortex.
What is the role of the parahippocampal gyrus of the brain?
Key cortical region for memory encoding.
What is the role of the uncus of the brain?
Part of the temporal lobe which has an important olfactory role.
What does the corpus callous of the brain contain?
Fibres connecting the two cerebral hemispheres.
What is the role of the thalamus of the brain?
Sensory relay station projecting to the sensory cortex.
What is the tole of the cingulate gyrus of the brain?
Cortical area important for emotion and memory.
What is the role of the fornix of the bran?
Major output pathway from the hippocampus.
What is the role of the tectum of the brain?
Dorsal part of the midbrain involved in involuntary responses to auditory and visual stimuli.
What are the brain ventricles?
Cavities in the brain containing choroid plexus which makes 600-700ml of CSF per day.
Where does CSF circulate though and where is it absorbed?
Circulated through the ventricular system and subarachnoid space. Is reabsorbed at the arachnoid granulations (projections in the arachnoid membrane into the dural venous sinuses).
What are the main roles of the cerebellum?
Motor control and coordination.
