Neuron is the functional unit of nervous system. Somatic nervous system (SNS) is a type of peripheral nervous system, which includes
• Cranial nerves
• Spinal nerves
There are total 12 pairs of cranial nerves in the body, which can be sensory, motor or mixed type. Cranial nerves send information to the head and to the internal body organs and glands.
Thus, the blank can be filled with head; internal body organs and glands.