Flashcards in General structure of the nervous system Deck (65)
What is the PNS made up of?
Nerves and ganglia
What is the brainstem composed of?
Midbrain, pons and medulla
Where is the white matter located in the cortex?
What is white matter composed of in the cortex?
Myelinated axons and glia
Where is the grey matter located in the cortex?
What is the grey matter composed of in the cortex?
Neuron cell bodies and glia
What cell type is found in both they grey and white matter of the cortex?
What technique can be used to visualise only white matter tracts in the brain?
Diffusion weighted MRI
What can diffusion weighted MRI be utilised for?
Viewing white matter tracts in the brain
Where does the kink/change in direction of the brain occur?
Between midbrain and diencephalon
What is the consequence of the kink/change in direction of the brain?
Twist in brain axis
Dorsal shifts from being 'upwards' to 'backwards'
What separates the two cerebral hemispheres?
What does the longitudinal fissure separate?
Left and right cerebral hemispheres
What are the ridges in the cerebrum called?
What are gyri?
Ridges in the cerebrum
What are the grooves in the cerebrum called?
What are sulci?
Grooves in the cerebrum
What is the surface of the cerebrum?
What is the functional significance of the four lobes of the cortex?
Very limited functional significance
They are arbitrary boundaries
Why are Brodmann areas significant?
Functional mapping of the brain, with defined boundaries that are functionally significant
What are Brodmann areas based on?
How are the left and right cerebral hemispheres joined?
Describe the structure of the cortex?
1 cm thick
Outer grey matter, inner white matter
Layered structure (6 layers)
What types of neurons are found in the cortex?
Pyramidal neurons and interneurons
What are the major roles of the cerebellum?
Comparing what you want to do with what you are doing
Refines execution of motor program
Where are most of the brain's neurons located?
Cerebellum (half of all neurons)
Where are basal ganglia found in the brain?
Deep within brain, beneath white matter
What are the roles of basal ganglia?
Selects and initiates voluntary movements
What is the consequence of damage to the basal ganglia?