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

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

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

13. Gyri

14. 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 ~

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

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

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