anatomy and phsiology II chapt 17
list the division of CNS
CNS ( brain,spinal cord)
PNS (cranial nerves, spinal nerves-> motor(efferent) & sensory(afferent)
motor-> somatic n.s. & ANS
ANS-> sympathetic & parasympathetic division
list the neuroglias (glial cells) supporting cells of the CNS & PNS
CNS- astrocytes, microglia, ependymal, oligodendrocytes
PNS- satellite cells, Schwann cells
Which is the most abundant, versatile and highly branched glial cells. cling to neurons, synaptic endings,and capilaries. support and brace neurons
which glial cell is small, ovoid cells with thorny processes, migrate toward injured neurons,phagocytize microorganisms and neuronal debris
which glial cell range in shape from squamous to columnar, maybe ciliated,line the central cavities of the brain and spinal column, separate the CNS interstitial fluid from the CSF in the cavities
Which glial are branched cells, processes that form myelin sheaths around CNS nerve fibers
which glial cell surround neuron cell bodies in the PNS
which glial cell surround peripheral large nerve fibers and form myelin sheaths, vital to regeneration of damaged peripheral nerve fibers
Schwann cells aka neurolemmocytes
rough ER is aka?
bundles of processes are called
CNS -tracts PNS-nerves
what is function of myelin sheath?
protect and electrically insulate the axon, increase speed of nerve impulse transmission
2)which subdivision of the PNS is involved in
1) "full stomach"
2) lifting your arm
3)increasing heart rate
1) sensory (afferent) division of PNS
2) motor (efferent) division of PNS
3) sympathetic division of ANS of PNS
1)what is meant by integration, and does it primarily occur in the CNS or PNS?
Intergration involves processing and interpreting sensory information, and making a decision about motor output. integration occurs primarily in the CNS.
3) which type of neuroglia contols the extracellular fluid environment around neuron cell bodies in the CNS? in the PNS?
astrocytes - EC - CNS
satellite cells - PNS
4) Which two types of neuroglia form insulating coverings called myelin sheaths?
oligodendrocytes and Schwann cells - CNS & PNS
5) Which part of the neuron is its fiber? How do nerve fibers differ from the fibers of connective tissue
a nerve fiber is a long axon, an extension of thecell. In connective tissue, fibers are extracellular proteins that provide support. In muscle tissue, a muscle fiber is a muscle cell.
6)How is a nucleus within the brain different from a nucleus within a neuron?
A nucleus within the brain is a cluster of cell bodies, whreas the nucleus within each neuron is a large organelle that acts as the control center of the cell.
7)How is a myelin sheath formed in the CSN, and what is its function?
In the CNS, a myelin sheath is formed by oligodendrocytes that wrap their plama membranes around the axon. It protects and electrically insulates fibers and increases the speed of transmission nerve impulses.