1. Anatomy of the Nervous System Dr. Alan H. Teich

3. Terms for anatomical directions in the nervous system. In four-legged animals dorsal and ventral point in the same direction for the head as they do for the rest of the body. However, human’s upright position has tilted the head relative to the spinal cord, so the dorsal and ventral directions of the head are not parallel to the dorsal and ventral directions of the spinal cord.

4. A sagittal section through the human brain

5. The limbic system is a set of subcortical structures that form a border (or limbus) around the brain stem

6. The basal ganglia The thalamus is in the center, the basal ganglia are lateral to it, and the cerebral cortex is on the outside.

8. The cerebral ventricles Diagram showing positions of the four ventricles.

10. Some major subdivisions of the human cerebral cortex The four lobes: occipital, parietal, temporal, and frontal.

11. The Homunculus

12. The human brain stem This composite structure extends from the top of the spinal cord into the center of the forebrain. The pons, pineal gland, and colliculi are ordinarily surrounded by the cerebral cortex.

13. Circle of Willis

14. Circle of Willis

15. Diagram of a cross section through the spinal cord The dorsal root on each side conveys sensory information to the spinal cord; the ventral root conveys motor commands to the muscles.

16. Sympathetic Nervous system

17. Parasympathetic Nervous System