Lab Quiz 5 Flashcards
Layer 4 of the neocortex is called the internal granular layer. What are its key afferents?
INFO from the thalamus
Layer 5 of the neocortex is called the internal pyramidal layer. What are its key efferents?
OUTPUTS: corticospinal, corticobulbar, corticopontine, and corticostriatal tracts
What happens if you get a lesion in the primary motor and premotor cortex?
Contralateral spastic paresis (homunculus)
What happens if you have a lesion in the frontal eye fields?
Eyes deviate to ipsilateral side
What happens if you have a lesion in Broca’s area (which usually in the left inferior frontal gyrus)?
Non-fluent speech, intact comprehension, impaired repetition. Often associated with contralateral facial and arm weakness
What happens if you have a lesion in the prefrontal cortex?
Frontal lobe syndrome: poor judgement, difficulty concentrating and problem solving, apathy, inappropriate social behavior
What do oligodendrocytes do?
Make myelin in CNS
What do ependymal cells do?
Line ventricles and make CSF
What do astrocytes do? *4 fxns)
- transport nutrients to neurons
- structural support
- regulate extracellular space
- clean up brain debris, digest dead neurons
what do microglia do?
CNS macrophages - eat invaders
What do you call layer 5 of the primary motor cortex? What sort of neurons are there?
Internal pyramidal. Betz cells
What does each layer of the neocortex do?
- Neuronal processes
- To and from other cortices
- To and from other cortices
- INPUT FROM THE THALAMUS
- Projections to Striatum, brainstem, and cord
- OUTPUT TO the thalamus
What layers of neocortex communicate with the thalamus?
4 is input; 6 is output
What layer is most heavily represented in the visual cortex?
FOUR
In what layer is the line of Gennari?
Four
