Nervous system

Also called nerve cells

Neurons

Are highly specialized to transmit messages (nerve impulse) from one part of the body to another

Neurons

The metabolic center of the neuron

Cell body

Particularly abundant in cell body

Nisslr Rough er Signup and view all the answers

Neuron processes that convey incoming messages toward cell body are

Dendrites Signup and view all the answers

Generate nerve impulses conduct away from the cell body

Axons Signup and view all the answers

Conelike region of the cell body

Axon hillock Signup and view all the answers

The axon terminals contains hundreds to thousands of tiny vesicles or membranous sacs, that contains chemicals called

Neurotransmitters Signup and view all the answers

Most long fibers are covered with a whitish, fatty material called

Myelin Signup and view all the answers

It protects and insulates the fibers and increases the speed of nerve impulse transmission.

Myelin sheaths Signup and view all the answers

The Schwann cell cytoplasm and exposed plasma membrane are referred to as the

Neurilemma Signup and view all the answers

The gaps or indentations of myelin sheats called

Nodes of Ranvier Signup and view all the answers

Cell bodies are found in the CNS in clusters called

Nuclei Signup and view all the answers

A disease grad- ually destroys the myelin sheaths around CNS fibers by converting them to hardened sheaths called

Sclerosis Signup and view all the answers

Small collections of cell body that are found in few sites of the PNS

ganglia Signup and view all the answers

Bundle of nerve fibers running through the CNS are called

Tracts Signup and view all the answers

Bundles of fibers running through the PNS are called

Nerves Signup and view all the answers

Consist of dense collections of myelinated fibers(tracts)

White matter Signup and view all the answers

Consist mostly unmyelinated fibers and cell bodies

Gray matter Signup and view all the answers

The simpler types of sensory receptors in the skin are

Cutaneous sensory organs Signup and view all the answers

Sensory receptors in the muscles and tendons are

Proprioceptors Signup and view all the answers

The most numerous and least specialized cutaneous receptors are called

pain receptors Signup and view all the answers

The ability or a Neuron to respond to a stimulus by producing nerve impulse

Irritability Signup and view all the answers

The ability of a neuron to transmit the impulse to other neurons, muscles or glands

Conductivity Signup and view all the answers