IB Biology: C3.1-Nerves as Bundles of Neurons

Front

What is a nerve?

Back

A nerve is a bundle of nerve fibres or neurons enclosed by a protective sheath.

Front

What is a neuron?

Back

A neuron is an individual cell specialized for transmitting impulses.

Front

What is a nerve fibre?

Back

A nerve fibre is a bundle of both sensory and motor neurons.

Front

What types of neurons make up a nerve?

Back

Nerves are made up of both myelinated and unmyelinated neurons.

Front

What do some cranial nerves contain?

Back

Some cranial nerves contain only sensory neurons, others contain only motor neurons, and some contain both types.

Front

What do spinal nerves contain?

Back

The 31 pairs of spinal nerves contain both sensory and motor neurons, carrying impulses in opposite directions.

Front

What are mixed nerves?

Back

Nerves that contain both sensory and motor neurons are called mixed nerves.