Table of Contents
What is a mass of nerve cells called?
A cluster of neurons is called a nucleus if found in the central nervous system; it is called a ganglion if found in the peripheral nervous system (PNS).
What is a nerve cell called quizlet?
Neurons. A nerve cell; the basic structural and functional unit of the nervous system. Connector neuron. A nerve cell in the brain or spinal cord that carries messages between other nerve cells; also called interneurons or association neurons.
What is a bundle of nerve cells called?
Each bundle of nerve fibers is called a fasciculus and is surrounded by a layer of connective tissue called the perineurium. Within the fasciculus, each individual nerve fiber, with its myelin and neurilemma, is surrounded by connective tissue called the endoneurium.
What is the largest mass of nerve tissue in the human body?
brain, the mass of nerve tissue in the anterior end of an organism. The brain integrates sensory information and directs motor responses; in higher vertebrates it is also the centre of learning. The human brain weighs approximately 1.4 kg (3 pounds) and is made up of billions of cells called neurons.
What are the types of nerve cells?
For the spinal cord though, we can say that there are three types of neurons: sensory, motor, and interneurons.
- Sensory neurons.
- Motor neurons.
- Interneurons.
- Neurons in the brain.
What is unique about nerve cells?
The distinguishing characteristic of nerve cells is their specialization for intercellular communication. This attribute is apparent in their overall morphology, in the specialization of their membranes for electrical signaling, and in the structural and functional intricacies of the synaptic contacts between them.
What are 3 things neurons have in common?
However, nearly all neurons have three essential parts: a cell body, an axon, and dendrites.
- Cell body. Also known as a soma, the cell body is the neuron’s core.
- Axon. An axon is a long, tail-like structure which joins the cell body at a specialized junction called the axon hillock.
- Dendrites.
How are nerves classified?
Nerves can be categorized as afferent, efferent, and mixed based on the direction of signal transmission within the nervous system. Nerves can be further categorized as spinal nerves or cranial nerves based on where they connect to the central nervous system.
Which is the smallest nerve in human body?
Trochlear nerve
Trochlear nerve is the smallest cranial nerve. Out of the 12 pairs of cranial nerves, the fourth paired cranial nerve, the trochlear nerve is the smallest of all by virtue of the number of axons.