1. Unit 3.1 The Nervous System

2. Regions of the Brain Cerebral hemispheres Diencephalon Brain stem
Cerebellum

3. Cerebrum Paired - L&R Hemispheres
Corpus Callosum connects the two halves
>1/2 brain mass
Ridges increase surface area
Grooves divide brain into 4 main lobes

4. Cerebral Hemispheres (Cerebrum)
Frontal lobe – reason, judgment, & memories
Parietal lobe – spatial sense, navigation, & mathematics
Occipital lobe - vision
Temporal lobe – hearing & forming long-term memories (hippocampus)

5. Specialized Areas of the Cerebrum

6. Layers of the Cerebrum Gray matter White matter
Outer layer composed mostly of neuron cell bodies
White matter
Axons leading away from the gray matter towards the body

7. Diencephalon Made of three parts
Thalamus – relay station for sensory input
Hypothalamus – controls body temp. & metabolism
Epithalamus – creates brain & spinal fluid

8. Brain Stem Attaches to the spinal cord Parts of the brain stem
Midbrain
Pons
Medulla oblongata – controls breathing & heart rate

9. Cerebellum Located beneath the occipital lobe
Different texture than the rest of the brain
Provides involuntary coordination of body movements