Nervous System Anatomy

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Structural Classification Central nervous system (CNS) Brain and spinal cord Peripheral Nervous System (PNS) Spinal and cranial nerves

tooth brush : teeth :: comb : hair nails ears eyes

Functional classification Afferent Sensory nerves Efferent Motor nerves

If a person is a quadriplegic which part of their nervous system is damaged? CNS PNS SOS NNS

Motor Nerves Somatic System Autonomic system Voluntary Involuntary Most skeletal muscle fibers Autonomic system Involuntary Sympathetic- “fight or flight” Parasympathetic- body at rest

Neurons Cell body Axon Dendrite Metabolic center Long fiber that conducts nerve impulses away from cb Dendrite Short fibers conducting impulses to cb

Myelin Sheath Schwann cells with gaps between Impulse travels along sheath

What is the function of the cell body ? carries impulse sends impulse metabolic center I don’t know

Nerve cells are called neurons prions prius neurocytes

Sensory Neurons Afferent Neurons carrying impulse from sensory receptors to the CNS Cutaneous receptors Skin Proprioceptors Muscles and tendons

Motor Efferent Neurons carrying impulse from CNS to muscles and glands