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

2. Peripheral Nervous System
Nerves and ganglia outside the central nervous system
Nerve = bundle of neuron fibers
Neuron fibers are bundled by connective tissue
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

3. Structure of a Nerve Endoneurium surrounds each fiber
Groups of fibers are bound into fascicles by perineurium
Fascicles are bound together by epineurium
Figure 7.20
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

4. Classification of Nerves
Mixed nerves – both sensory and motor fibers
Afferent (sensory) nerves – carry impulses toward the CNS
Efferent (motor) nerves – carry impulses away from the CNS
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

5. PNS: Cranial Nerves
Twelve pairs of nerves that mostly serve the head and neck
Only the pair of vagus nerves extend to thoracic and abdominal cavities
Most are mixed nerves, but three are sensory only.

6. Cranial Nerves Mnemonic
Oh, once one takes the anatomy final very good vacations are heavenly!
Olfactory, Optic, Oculomotor, Trochlear, Trigeminal, Abducens, Facial, Vestibulocochlear, Glossopharyngeal, Vagus, Spinal Accessory (Accessory), Hypoglossal

7. Cranial Nerves
Marieb 13.5a

8. Cranial Nerves I. Olfactory nerve—sensory for smell
II. Optic nerve—sensory for vision
III. Oculomotor nerve—motor fibers to eye muscles
IV. Trochlear—motor fiber to one eye muscle
V. Trigeminal nerve—sensory for the face; motor fibers to chewing muscles
VI. Abducens nerve—motor fibers to eye muscles
VII. Facial nerve—sensory for taste; motor fibers to the face.

9. Cranial Nerves
VIII. Vestibulocochlear nerve—sensory for balance and hearing
IX. Glossopharyngeal nerve—sensory for taste; motor fibers to the pharynx
X. Vagus nerves—sensory and motor fibers for pharynx, larynx, and viscera
XI. Accessory nerve—motor fibers to neck and upper back
XII. Hypoglossal nerve—motor fibers to tongue

10. VIII Vestibulocochlear
III Oculomotor
IV Trochlear
VI Abducens
I Olfactory
II Optic
V Trigeminal
V Trigeminal
VII Facial
Vestibular
branch
Cochlear
branch
VIII Vestibulocochlear
X Vagus
IX Glossopharyngeal
XII Hypoglossal
XI Accessory
Figure 7.24