Biochem Ch 3

The division that located outside the skull and spine

The division of the nervous system that is located within the skull (brain) an spine (spinal chord)

The part of the PNS that interacts with the external environment

· PNS composed of afferent nerves: carry sensory signals from the skin, skeletal muscles, joints, eyes, ears, etc. to the central nervous system

Carry motor signals from the central nervous system to the skeletal muscles (PNS)

The part of the peripheral nervous system that regulates the body’s internal environment
- composed of afferent nerves that carry sensory signals from internal organs to the CNS and efferent nerves that carry motor signals from the CNS to internal organs

Autonomic motor nerves that project from the CNS in the lumbar and thoracic regions of the spinal chords

Autonomic motor nerves that project from the brain and sacral region of the spinal chord

· Most of the nerves of the peripheral nervous system project from the spinal chord—but there are 12 cranial nerves which project from the brain that are sensory nerves

The brain and spinal chord (CNS) are protected by bone and protective membranes

tough outer membrane

beneath arachnoid membrane—contains blood veessels and cerebrospinal fluid

innermost layer—adheres to surface of the CNS

protects CNS—fills subarachnoid space, the central canal of the spinal chord, and the cerebral ventricles of the brain; supports and cushions the brain

Small central channel that runs the length of the spinal cord