Answer :

A third-order neuron is an interneurons the shortest neuron in either a sensory or a motor pathway is excites or inhibits the pathway.

A neuron, or nerve cell is an electrically excitable cell that communicates with other cells via specialized connections called synapses. In all species, the neuron is the main component of nervous tissue, with the exception of sponges and placozoa. Non-animals such as fungi and plants are instances of organisms without nerve cells. The roles of three different types of neurons can generally be identified. Sense neurons, which impact the cells of the sensory organs, send signals to the spinal cord or brain in response to stimuli like touch, sound, or light. Motor neurons get guidance from the brain and spinal cord to regulate anything from glandular secretion to muscle contractions. Interneurons exist in the same area of the brain or spinal cord. An axon, dendrites, and cell body comprise a typical neuron (soma). The soma, which is a compact structure, is the source of the axon and dendrites. Dendrites typically extend hundreds of micrometers from the soma and branch out widely.

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