nervous system

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Which part of the nervous system includes the brain and spinal cord?

Sensory nervous system

Central nervous system (correct)

Motor nervous system

Peripheral nervous system

What are the two main cell types in nerve tissue?

Oligodendrocytes and microglia

Neurons and astrocytes

Astrocytes and microglia

Neurons and oligodendrocytes (correct)

What is the function of astrocytes in the nervous system?

Support and nourishment of neurons (correct)

Distribution of the meninges

Histologic structure of nerve fibers

Production of myelin

What is the role of oligodendrocytes in nerve tissue?

Production of myelin Signup and view all the answers

What is the function of ependymal cells in the nervous system?

Line the ventricles of the brain and spinal canal Signup and view all the answers

What is the role of microglia in nerve tissue?

Immune defense and scavenging cellular debris Signup and view all the answers

What is the function of Schwann cells in the peripheral nervous system?

Production of myelin Signup and view all the answers

Which part of the neuron receives signals from numerous other neurons?

Dendrites Signup and view all the answers

Which part of the neuron typically has only one and does not branch?

Axon Signup and view all the answers

Which type of glial cell is the most numerous in the brain?

Astrocytes Signup and view all the answers

Which glial cell type makes myelin and insulates axons in the central nervous system?

Oligodendrocytes Signup and view all the answers

What is the function of microglial cells in the central nervous system?

Eat up debris and dead cells Signup and view all the answers

What is neuropil?

A dense network of glial fibers Signup and view all the answers

What is the function of dendritic spines?

Receive information from a single axon Signup and view all the answers

Which cells are involved in the transfer of molecules from blood to neurons and are also involved in the blood-brain barrier?

Astrocytes Signup and view all the answers

What is the main function of astrocytes?

To regulate the composition of the extracellular environment and support the survival and activity of neurons Signup and view all the answers

What is the main function of ependymal cells?

To line the central canal of the spinal cord and ventricles of the brain Signup and view all the answers

What is the main function of microglial cells?

To act as immune defender cells Signup and view all the answers

What is the main glial cell of the peripheral nervous system?

Neurolemmocytes or Schwann cells Signup and view all the answers

What is the function of gray matter in the brain and spinal cord?

Contains neuron cell bodies, dendrites, unmyelinated axons, glial cells, and synapses Signup and view all the answers

What are the three layers of the meninges that surround the brain and spinal cord?

Dura mater, arachnoid mater, pia mater Signup and view all the answers

Which layer of the meninges is in contact with the dura mater?

Arachnoid Signup and view all the answers

What is the function of the blood-brain barrier?

Prevents passage of drugs and toxins into CNS tissue Signup and view all the answers

What are the two main components of the peripheral nervous system?

Nerves and ganglia Signup and view all the answers

What surrounds and forms myelin around PNS axons?

Schwann cells Signup and view all the answers

What are nodes of Ranvier?

Breaks in the myelin sheath Signup and view all the answers

What is the outer dense connective tissue fibrous coat surrounding nerve bundles and spaces between nerve fibers called?

Epineurium Signup and view all the answers

What surrounds each fiber bundle or fascicle in the peripheral nervous system?

Perineurium Signup and view all the answers

What is the innermost layer of the meninges called?

Pia mater Signup and view all the answers

What is the function of the astrocyte foot processes in the blood-brain barrier?

Forms tight junctions between endothelial cells Signup and view all the answers