Which part of the neuron below is indicated by the arrow, and what is its function?

Neuron : the nerve cells that transfer information within the body.
Neurons can be placed into three groups, based on their location and function.Sensory neurons, interneurons, motor neurons.

sensory neuron :Transmit information from a sense receptor to the brain or spinal cord

interneuron:Integrate information within brain or spinal cord; connect sensory and motor neurons; located entirely within the CNS

motor neuron:Transmit information from the brain or spinal cord to a muscle or gland; Cause muscle contraction or gland secretion