Automatic

Structural Organization of the Nervous System

  • The human nervous system is structurally and functionally organized into hierarchical divisions to control bodily functions, process information, and maintain homeostasis.


Branches of the Nervous System Hierarchy

  • Central Nervous System (CNS):

    • Anatomical structures: Consists of the brain and the spinal cord.

    • Primary function: Acts as the primary integrative and control center of the entire body.

  • Peripheral Nervous System (PNS):

    • Anatomical structures: Composed of cranial nerves (extending from the brain) and spinal nerves (extending from the spinal cord).

    • Primary function: Serves as communication lines connecting the CNS to all other parts of the body.

  • Functional Subdivisions of the PNS:

    • Sensory (Afferent) Division:

    • Composition: Somatic and visceral sensory nerve fibers.

    • Function: Conducts sensory nerve impulses from internal and external sensory receptors to the CNS for integration.

    • Motor (Efferent) Division:

    • Composition: Motor nerve fibers.

    • Function: Conducts motor impulses away from