In the spinal cord explain the location, shape and components of grey matter.
The grey matter, in the center of the cord, is shaped like a butterfly and consists of cell bodies of interneurons and motor neurons, as well as neuroglia cells and unmyelinated axons.
Dorsal roots and__________ come together and exit the intervertebral foramina as they become spinal_____________.
Ventral roots; nerves
What are microglial cells
cells that destroy pathogens in the central nervous system
what are blood capillaries of the brain surrounded by
what is the blood brain barrier BBB
filtering mechanism of the capillaries that carry blood to the brain and spinal cord tissue, blocking the passage of certain substances.
Characteristics of the CSF
It is produced in the choroid plexuses of the ventricles of the brain. It acts as a cushion or buffer for the brain's cortex, providing basic mechanical and immunological protection to the brain inside the skull.
The myelin sheaths in the CNS are made up of
Absolute Refractory period
. This is the time during which another stimulus given to the neuron (no matter how strong) will not lead to a second action potential.
The Refractory period (relative refractory period)
the period shortly after the firing of a nerve fiber when partial repolarization has occurred and a greater than normal stimulus can stimulate a second response—called also relative refractory phase
Cerebral spinal fluid is produced by what kind of cell and where
Ependymal cells; choriod plexus
The resting membrane is maintained in the neuron by what mechanism
The sodium potassium pump
Produce myelin sheaths in the CNS
nerve fibers that carry pain impulses to the spinal cord have their cell bodies
produce myelin sheaths in the PNS
schwann cells and neurilimocytes