What kind of neurons serve as links between the sensory neurons and the motor neurons?
Interneurons are the neurons that make up the central nervous system (the brain and spinal cord). They internally communicate between the input from sensory neurons and our physical reaction triggered by the motor neurons.
Within the spinal cord, there are interneurons which link sensory and motor neurons. In some cases though, the sensory neurons synapse directly onto the motoneurons for example the Ia afferent (sensory neuron from the spinal cord) has a monosynaptic (1 synapse) connection to alpha motoneurons in the spinal cord. This monosynaptic connection is the reason why stretch reflexes can occur rapidly.
Functionally, neurons come in three varieties; motor neurons, sensory neurons and interneurons. Motor neurons conduct motor impulses from the CNS to the muscles. Sensory neurons conduct motor impulses from the rest of the body to the CNS. Interneurons connect the sensory to the motor so we can respond to incoming sensory stimuli.
Interneurons, which make sense--they're the intermediaries. Many interneurons can send simultaneous messages to the brain and motor neurons--this is called a reflex arc. This is the interneuron. It is in the spinal cord. They act as a "go between" the sensory neuron and the motor neuron. They also send information to the brain so that the brain is aware. Reflex arcs do NOT have these interneurons.
Sensory neurons are specialized to translate many forms of input (light waves, sound waves, tissue displacement, molecules suspended in air or dissolved in saliva, and so on) into action potentials. Motor neurons carry commands to glands and muscles. Association neurons have neither specific sensory nor motor functions, but rather form bridges between the sensory and motor neurons.
There are three types of neurons. 1.Sensory neurons: which carry impulses from the sense organs to the brain and spinal cord. 2.Motor neurons : which perform an opposite function to that of sensory neurons by carrying impulses from the brain and spinal cord to muscles and glands. 3. Inter neurons : which connect sensory and motor neurons and carry impulses between them.