The Nervous System- Glial Cells
Astrocytes (CNS)
Most abundant, versatile, and highly branched Cling to neurons, synaptic endings, and capillaries Functions: connects capillaries to neurons. maintains chemical environment around neurons guides neurons for brain and spinal development
CNS neuroglial cells
astrocytes, oligodendrocytes, microglia, ependymal
Schwann cells (PNS)
form myelin sheaths around nerve fibers Function: electrically insulates neurons
Microglial cells (CNS)
found in brain and spinal cord Function: macrophage (cell-eating-phagocytosis) migrates to unhealthy cells and debris
How is a myelin sheath formed in CNS & what is its function?
in the CNS, a myelin sheath is formed by oligodendrocytes that wrap their plasma membrane around the axon. the myelin sheath protects and electrically insulates axons and increases speed of transmission of nerve impulses.
Oligodendrocytes (CNS)
line around thicker CNS & wrap fibers around the process (myelin sheath) Function: electrically insulate neurons
Which two types of neuroglia form insulating coverings called myelin sheaths?
oligodendrocytes(CNS) and schwann cells (PNS) form myelin sheaths in CNS & PNS
neuroglial cells (glial cells)
provide physical support, insulation, and nutrients for neurons
satellite cells (PNS)
surround neuron cell bodies in PNS Function: maintain the chemical environment of neurons in PNS & control extracell. enviroment
what type of neuroglia controls the extracellular fluid environment around neuron bodies in the CNS/ PNS?
CNS- Astrocytes PNS- Satellite cells
Ependymal cells (CNS)
Lines the ventricles in brain and spinal cord Function: circulates spinal fluid & fluid production
PNS glial cells
Schwann cells and satellite cells