The<unk>  is spread through all major parts of the vertebrate body. It consists both of sensory receptors and sensory neurons in the periphery (skin, muscle and organs for example), to deeper neurons within the central nervous<unk> .
Somatosensory system
Parasympathetic nervous system
Autonomic nervous system
Motor system
Endocrine system
Central pattern generator
Neural pathway
Cranial nerves