Anatomy-Neural Tissue Flashcards
What composes the gray and white matter depicted in this image?
Gray matter: Neruon bodies, astroglia,and dendrocytes. White matter: axons covered by a myelin sheath
What parts of the brain comes from the ectoderm?
The neural tube that will eventually become the CNS and the neural crests that will eventually become the PNS.
What is different about development of neurons in the PNS vs the CNS?
CNS development stays within the tube and does not come in contact with the outer environment. PNS development from the neural crest sends neurons into all parts of the body.
What is covering this neuron?
Presynaptic boutons (nerve endings from other neurons)
How are dendrites so varying when cell bodies are so similar?
They are extensions of the cell body and can make protein LOCALLY, specific to their function
What part of a neuron is motile?
Dendrites
What triggers ACh release?
Ca entry to the synaptic membrane
What are the supportive cells or the CNS?
Astroglia, microglia and oligodendrocytes
What are the key functions of astrocytes?
Neuronal structural support, reaction to injuries, nourishin neurons, take up toxic metabolites and for the blood brain barrier.
What cells form the myelin sheets around axons?
Oligodendrocytes
What allows for saltatory conduction of nerve signals?
Node of Ranevier
Why are myelin damaging diseases catastrophic to the nervous system?
They slow conduction of the synapse and make the system go out of sync
Who are the phagocytes of the CNS?
Microglial cells
Who lines ventricles and secretes CSF?
Ependymal cells
