Nervous Tissue Histology

Neuroglia of the peripheral nervous system

satellite and Schwann Cells

what cell links a sensory and motor neuron in a reflex arc?

interneuron

structural difference between bipolar and pseudo-unipolar neurons

bipolar cell body is between the dendrite and axon, pseudo-unipolar cell body is like a lobe hanging off between the peripheral and central axon

Dendrites contain the same organelles as the cell body except for ______

golgi

The structure of dendrites is supported by ______ and _______

microtubules; intermediate filaments

intermediate filaments of neurons

neurofibrils

dendrites are ____-myelinated

un

dendrites have a ______ diameter than axons

larger

Perikaryon means

cell body

dendritic spines are locations on dendrites where ____

axons of other cells synapse

Axons lack ________

Nissl substance

Axons are usually _______

myelinated

Nissl substance is indicitive of ______ and indicates presence of what organelle?

amino acids; rough ER

Major oragnelles in the axon

neurofibrils, mitochondria, vesicles

Neuroglia of the CNS

ependymal, microglia, astrocytes, oligodendrocytes

_______ cells secrete myelin sheath

Schwann

_____ are the smallest of the CNS glia and modulate synaptic transmission by releasing _____

Microglia; cytokines

Dendritic spines increase _____ _____ to allow for more contact points. They are _____ structures, meaning ____

surface area; non-permanent; they can be added or removed as needed

Ependymal cells range in shape from ____ to ____. They may have ______ , which functions to _______

squamous; columnar; cilia; circulate the CSF

______ cells form a permeable barrier b/w CSF in cavities and tissue fluid bathing CNS cells

Ependymal

______ ______ are indicative of a synapse

dense plaques

Sensory ganglia have _____ neurons enveloped by ____ ____ cells

unipolar; cuboidal capsule

Autonomic ganglia (postganglionic) have _____ neurons enveloped by ______ cells

multipolar; satellite

membrane that surrounds schwann cells

endoneurium

membrane that surrounds fascicles containing multiple schwann cells

perinerurium

membrane surrounding an entire spinal nerve

epineurium

_________ myelinate CNS axons

oligodendrocytes

______ maintain the blood-brain barrier and provide structural support

astrocytes

_____ remove cell debris, wastes, and pathogens in the CNA

microglia

______ cells regulate O2, CO2, nutrient and NT levels around neurons in ganglia in the PNS

Satelite