Organization of the human nervous system

Sensory neurons

Transmit sensory information for receptors to the spinal cord and brain

Motor neurons

Transmit motor information from the brain and spinal cord to muscles and glands

Internerons

Found between other neurons and send signals directly to muscles

Central nervous system (CNS)

Compose of the brain in spinal cord

Peripheral nervous system

Made up of nerve tissue and fibers outside of the brain and spinal cord; include spinal and cranial nerves

Somatic nervous system

A subdivision of the PNS which consist of sensory and motor neurons distributed throughout the skin, joints and muscles; transmits information toward the CNS

Autonomic Nervous System

A subdivision of the PNS system which regulates heartbeat, respiration digestion, and glandular secretions

Parasympathetic nervous system

Associated with resting and sleeping states and asked to reduce heart rate and constrict the bronchi; main role used to conserve energy

Sympathetic nervous system

A subdivision of the autonomic nervous system; activated by stress, common symptoms induced increased heart rest, blood glucose concentration, relaxed bronchi, decreased digestion etc.