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Organization of the Nervous System . Lesson 2. The Central Nervous System. CNS Brain Spinal cord ~. Peripheral Nervous System. Somatic Nervous System - SNS Sensory & Motor Autonomic Nervous System - ANS Sympathetic Division Parasympathetic Division Cranial Nerves - 12 Pair

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Presentation Transcript
the central nervous system
The Central Nervous System
  • CNS
    • Brain
    • Spinal cord ~
peripheral nervous system
Peripheral Nervous System
  • Somatic Nervous System - SNS
    • Sensory & Motor
  • Autonomic Nervous System - ANS
    • Sympathetic Division
    • Parasympathetic Division
  • Cranial Nerves - 12 Pair
  • Spinal Nerves - 31 Pair ~
divisions of the brain
Divisions of the Brain
  • Different schemes
    • Forebrain, midbrain, hindbrain
    • 5 major subdivisions
  • Forebrain

1. Telencephalon

2. Diencephalon ~

divisions of the brain5
Divisions of the Brain
  • Midbrain -

3. Mesencephalon

  • Hindbrain

4. Metencephalon

5. Myelencephalon ~

slide6

Dorsal

Superior

Anterior

Posterior

Rostral

Caudal

Ventral

Inferior

Terminology

In reference to the BRAIN

brainstem spinal cord

Superior

Rostral

Ventral

Dorsal

Anterior

Posterior

Caudal

Inferior

Brainstem & spinal cord
terminology
Terminology
  • Medial - toward the midline
  • Lateral - away from the midline
  • Ipsilateral - same side
  • Contralateral - opposite side
  • Decussate - crossover ~
terminology10
Terminology
  • Afferent - toward
    • Sensory
  • Efferent - away from
    • Motor ~
telencephalon
Telencephalon
  • Cortical areas
  • Fiber systems
  • Landmarks
    • Fissures /Sulci
    • Lobes
    • Gyri ~

Superior surface

the meninges
The Meninges
  • Tough connective tissue
  • Dura mater - tough outer layer
  • Arachnoid membrane
    • Subarachnoid space
    • Cerebrospinal Fluid (CSF)
  • Pia mater - soft inner layer, next to brain ~
the meninges15
The Meninges

Dura mater

Arachnoid membrane

Subarachnoid space CSF

Pia mater

Brain

ventricular system
Ventricular System
  • 4 interconnected ventricles
    • chambers
  • Cerebrospinal Fluid (CSF)
    • manufactured in choroid plexus
    • 125 ml, t1/2= 3 hrs
  • Hydrocephalus
    • blockage of CSF flow ~
ventricular system17

Cerebral Aqueduct

Central Canal

Ventricular System

Lateral Ventricles

L V

L V

Third Ventricle

3rd

Fourth Ventricle

4th