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Organization of the Nervous System

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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Organization of the Nervous System

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  1. Organization of the Nervous System Lesson 2

  2. The Central Nervous System • CNS • Brain • Spinal cord ~

  3. 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 ~

  4. Divisions of the Brain • Different schemes • Forebrain, midbrain, hindbrain • 5 major subdivisions • Forebrain 1. Telencephalon 2. Diencephalon ~

  5. Divisions of the Brain • Midbrain - 3. Mesencephalon • Hindbrain 4. Metencephalon 5. Myelencephalon ~

  6. Dorsal Superior Anterior Posterior Rostral Caudal Ventral Inferior Terminology In reference to the BRAIN

  7. Superior Rostral Ventral Dorsal Anterior Posterior Caudal Inferior Brainstem & spinal cord

  8. Neural Axis

  9. Terminology • Medial - toward the midline • Lateral - away from the midline • Ipsilateral - same side • Contralateral - opposite side • Decussate - crossover ~

  10. Terminology • Afferent - toward • Sensory • Efferent - away from • Motor ~

  11. Telencephalon • Cortical areas • Fiber systems • Landmarks • Fissures /Sulci • Lobes • Gyri ~ Superior surface

  12. Gyri

  13. 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 ~

  14. The Meninges Dura mater Arachnoid membrane Subarachnoid space CSF Pia mater Brain

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

  16. Cerebral Aqueduct Central Canal Ventricular System Lateral Ventricles L V L V Third Ventricle 3rd Fourth Ventricle 4th

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