1. Bell Ringer
1. Motor neurons receive impulses from the muscles in order to regulate glandular secretions.
A) True
B) False
2. The nucleus of a neuron is always located within the cell body region.
False
Impulses within a neuron always travel from the dendrite towards the axons.

2. Topic 7 The Nervous System
Essentials of Human Anatomy & Physiology
Seventh Edition
Elaine N. Marieb
Topic 7 The Nervous System
Central Nervous System
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

3. Central Nervous System (CNS)
CNS develops from the embryonic neural tube
The neural tube becomes the brain and spinal cord
The opening of the neural tube becomes the ventricles
Four chambers within the brain
Filled with cerebrospinal fluid
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4. Cerebral hemisphere Outline of diencephalon Midbrain Cerebellum
Brain stem
(a) 13 weeks
Figure 7.12a

5. Regions of the Brain Cerebral hemisphere Diencephalon Cerebellum
(b) Adult brain
Cerebral
hemisphere
Diencephalon
Cerebellum
Brain stem
Figure 7.12b

6. Cerebral Hemispheres (Cerebrum)
Paired (left and right) superior parts of the brain
Include more than half of the brain mass
Figure 7.13a
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7. Cerebral Hemispheres (Cerebrum)
The surface is made of ridges (gyri) and grooves (sulci)
Figure 7.13a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

8. Lobes of the Cerebrum
Fissures (deep grooves) divide the cerebrum into lobes
Surface lobes of the cerebrum
Frontal lobe
Parietal lobe
Occipital lobe
Temporal lobe
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9. Lobes of the cerebrum Parietal lobe Left cerebral hemisphere Frontal
Occipital
lobe
Temporal
lobe
Cephalad
Cerebellum
Caudal
Brain
stem
(b)
Figure 7.13b

10. Regions of the Brain: Cerebrum
Specialized areas of the cerebrum
Primary somatic sensory area
Receives impulses from the body’s sensory receptors
Located in parietal lobe
Primary motor area
Sends impulses to skeletal muscles
Located in frontal lobe
Broca’s area
Involved in our ability to speak

11. Primary somatic sensory Gustatory area (taste) Posterior association
Central sulcus
Primary somatic sensory
area
Gustatory area (taste)
Speech/language
(outlined by dashes)
Posterior association
Visual area
Auditory area
Primary motor area
Anterior
association area
• Working memory
and judgment
• Problem
solving
• Language
comprehension
Broca’s area
(motor speech)
Olfactory
Premotor area
(c)
Figure 7.13c

12. Sensory and Motor Areas of the Cerebral Cortex
Figure 7.14
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13. Specialized Area of the Cerebrum
Cerebral areas involved in special senses
Gustatory area (taste)
Visual area
Auditory area
Olfactory area
Interpretation areas of the cerebrum
Speech/language region
Language comprehension region
General interpretation area
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings