Nervous System Histology

Nervous System Histology - Oligodendrocyte Form myelin...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Nervous System Nervous System Histology Consist of two types of neurons * Neuroglia - serve to support and protect the neurons. * generally smaller than neurons and outnumber neurons 5-50 times. * Neurons - the main cell of the nervous system that is specialized for nerve impulse conduction. Neuroglia * Central Nervous System * Astrocytes * Oligodendrocytes * Microglia cells * Ependymal cells * Peripheral neuroglia * schwann cells (neurolemmocytes) * satellite cells Central Nervous System Neuroglia Central Nervous System Neuroglia * Astrocytes * are the most abundant and functionally diverse * Help form the blood brain barrier with cytoplasmic extensions called perivasular feet that stimulate the endothelial cells to from tight junctions * convert glucose to lactate for neuronal nourishment * Participate in the metabolism of neurotransmitters * form brain scar tissue ( astrocytosis , gliosis sclerosis) Blood Brain Barrier * Regulates the passage of substances into the brain * Capillary wall * Astrocyte processes Central Nervous System Neuroglia
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: * Oligodendrocyte * Form myelin sheath around CNS neurons Central Nervous System Neuroglia * Microglia * Phagocytic cells that engulf destroy microbes and cellular debris in the CNS * active in response to inflammation or injury Microglia Astrocyte & Microglia Central Nervous System Neuroglia * Ependymal Cells- * Line the ventricles (spaces filled with CSF) of the brain and the central canal of the spinal cord Nervous System * Produce cerebrospinal fluid * Assist in the circulation of the CSF Peripheral Nervous System Neuroglia * Schwann cells (neurolemmocytes) Each cells produces part of the myelin sheath around a single axon in the PNS. * Neurolemma (sheath of Schwann)- the outer nucleated cyotplasmic layer of the neurolemmocyte. * Nodes of Ranvier (neurofibral nodes)- periodic gaps in the myelin sheath. Myelinated Axons Satellite Cells * surround the neuron cell bodies in ganglia of the PNS. Little is known of their function....
View Full Document

{[ snackBarMessage ]}

Page1 / 2

Nervous System Histology - Oligodendrocyte Form myelin...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online