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PowerPoint ® Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College Copyright © 2009 Pearson Education, Inc., publishing.

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Presentation on theme: "PowerPoint ® Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College Copyright © 2009 Pearson Education, Inc., publishing."— Presentation transcript:

1 PowerPoint ® Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings PART C 7 Peripheral Nervous System

2 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Peripheral Nervous System (PNS) Nerves and ganglia outside the central nervous system Nerve = bundle of neuron fibers Neuron fibers are bundled by connective tissue

3 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings PNS: Structure of a Nerve Endoneurium surrounds each fiber/axon Groups of fibers are bound into fascicles by perineurium Fascicles are bound together by epineurium

4 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings PNS: Classification of Nerves Mixed nerves Both sensory and motor fibers Sensory (afferent) nerves Carry impulses toward the CNS Motor (efferent) nerves Carry impulses away from the CNS

5 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Cranial Nerves 12 pairs of cranial nerves Control head, neck, part of trunk, and upper limbs Numbered in order and name tells about its function

6 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Cranial Nerves I. Olfactory– sensory, carries impulses for sense of smell II. Opticsensory, carries impulses for vision III. Oculomotormotor, controls 4 of 6 eye movement muscles, eyelid, lens shape, and pupil size IV. Trochlearmotor, controls external eye muscles V. Trigeminalsensory: conducts impulses from skin of face and mucosa of nose and mouth. Motor: fibers that activate chewing muscles VI. Abducensmotor, controls muscles that roll the eye laterally

7 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Cranial Nerves VII. Facialactivates muscles of facial expression, lacrimal and salivary glands. Also carries sensory info from the taste buds of anterior tongue. VIII. Vestibulocochlearsensory, vestibular branch transmits info for sense of balance, cochlear branch transmits info for sense of hearing IX. Glossopharyngealmotor: supplies fibers to the throat that promote swallowing and saliva production. Sensory: transmits info from taste buds of posterior tongue and pressure receptors of the carotid artery X. Vaguscarries sensory and motor info to the throat, voicebox and abdominal/thoracic viscera

8 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Cranial Nerves XI. Accessorymotor, fibers activate trapezius and sternocleidomastoid muscles XII. Hypoglossalmotor, control of tongue movements. Sensorycarry impulses from the tongue Mnemonic Device: On, On, On, They Traveled And Found Voldemort Guarding Very Ancient Horcruxes

9 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings PNS: Spinal Nerves There is a pair of spinal nerves at the level of each vertebrae for a total of 31 pairs Formed by the combination of the ventral and dorsal roots of the spinal cord Named for the region from which they arise

10 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Spinal Nerves

11 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings PNS: Anatomy of Spinal Nerves Spinal nerves divide soon after leaving the spinal cord Dorsal ramiserve the skin and muscles of the posterior trunk Ventral ramiform a complex of networks (plexus) for the anterior The rami, like spinal nerves, contain both motor and sensory fibers

12 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings Nerve Plexuses The ventral rami also form complex networks of nerves called plexuses Plexuses serve the motor and sensory needs of the limbs.

13 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings PNS: Spinal Nerve Plexuses

14 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings PNS: Spinal Nerve Plexuses

15 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings PNS: Distribution of Major Peripheral Nerves of the Upper and Lower Limbs

16 Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings PNS: Distribution of Major Peripheral Nerves of the Lower Limbs


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