1. Organization of the Nervous System Lesson 3

2. The Central Nervous System n CNS l Brain l Spinal cord ~

3. Peripheral Nervous System n Somatic Nervous System - SNS l Sensory & Motor n Autonomic Nervous System - ANS l Sympathetic Division l Parasympathetic Division n Cranial Nerves - 12 Pair n Spinal Nerves - 31 Pair ~

4. Divisions of the Brain n Forebrain 1. Telencephalon 2. Diencephalon n Midbrain 3. Mesencephalon n Hindbrain 4. Metencephalon 5. Myelencephalon ~

5. Terminology n Dorsal / Ventral n Anterior / Posterior n Rostral / Caudal n Superior / inferior n Medial / Lateral n Ipsilateral / Contralateral n Decussate n Afferent / Efferent ~

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

7. Brainstem & spinal cord VentralDorsal Rostral Caudal AnteriorPosterior Superior Inferior

8. Neural Axis

9. n Coronal or frontal l cross-section - salami n Sagittal - side view l hot-dog bun n Horizontal l top view ~ Planes

10. Telencephalon n Cortical areas n Fiber systems n Landmarks l Fissures /Sulci l Lobes l Gyri ~ Superior surface

12. Gyri

13. The Meninges n Tough connective tissue n Dura mater - tough outer layer n Arachnoid membrane l Subarachnoid space l Cerebrospinal Fluid (CSF) n Pia mater - soft inner layer, next to brain ~

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

15. Ventricular System n Continuous with subarachnoid space n 4 interconnected ventricles l chambers n Cerebrospinal Fluid (CSF) l manufactured in choroid plexus l 125 ml, t 1/2 = 3 hrs l Buoyancy: 1400 g  50 g n Hydrocephalus l blockage of CSF flow ~

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