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Organization of the Nervous System. Overview of the Central (CNS), Peripheral (PNS), Autonomic (ANS), Enteric (ENS) Nervous Systems. Brain. Structure Ventricles Meninges Organization Function. Meningial Cell.

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organization of the nervous system

Organization of the Nervous System

Overview of the

Central (CNS),

Peripheral (PNS),

Autonomic (ANS),

Enteric (ENS)

Nervous Systems

  • Structure
    • Ventricles
    • Meninges
  • Organization
  • Function
meningial cell
Meningial Cell
  • Cells that form the meningeal cell layers of the meninges covering the brain and spinal cord
  • is a three layered covering of brain in which blood vessels travel and cerebrospinal fluid (CSF) is absorbed.
  • Meninges means “covering”in Greek
  • Dura Mater: hard mother in Latin
  • Arachnoid Membrane: spider web like
  • Pia Mater : gentle mother in Latin
dura mater
Dura Mater:
  • tough inelastic leather-like membrane covering brain/spinal cord
  • Blood vessels cross through it
  • Protects brain and spinal cord
arachnoid membrane
Arachnoid Membrane:
  • Spider-web like membrane
  • Sub-arachnoid space is filled with CSF and the arachnoid villi of blood vessels of the arachnoid re-absorb the CSF
pia mater
Pia Mater
  • closely adheres to brain and spinal cord tissue
  • Blood vessels penetrate pia to supply brain
  • Separated from arachnoid membrane by the subarachnoid space
blood brain barrier
blood-brain barrier
  • blood vessels have special anatomy that provides blood-brain barrier that prevents toxins, viruses and improper chemical environment from affecting brain cells.
  • The brain is hollow, ie there are CSF-filled caverns and canals inside the brain
  • Two lateral ventricles, left and right
  • 3rd ventricle
  • 4th ventricle
ependymal cell
Ependymal Cell
  • Epithelial cells that line the ventricular system
  • Can also secrete CSF in some locations of the ventricles
  • CSF cushions & protects brain and provides chemical environment for proper brain function
  • Choroid plexus (epithelial cells) resides in 3rd & 4th ventricle and makes CSF
  • Hydrocephalus (water on the brain) results from accumulation of CSF
  • Smallest glial cell
  • No known role in healthy nervous system\
  • Involved in repair of nervous system after injury or infection
  • Multiply quickly, migrate to injured area and phagocytize dead cells.
  • Behave like macrophages
exam 1
Exam 1
  • Cells: Chapter 1-Nolte-Human Brain
  • History: Chapter 1- Bear
  • Organization of NS: Ch 7 Bear
    • Or
  • any book on reserve has a chapter devoted to general organization