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The Peripheral Nervous System (PNS)

The Peripheral Nervous System (PNS). 31 pairs of spinal nerves and 12 cranial nerves outside the CNS. I. Spinal Nerves. Lead to and from the spinal cord Plexuses- “braid”, cluster of nerves except T2-T12. I. Spinal Nerves. Cervical / brachial plexus- 8 nerves around the 7 cervical vertebrae

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The Peripheral Nervous System (PNS)

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  1. The Peripheral Nervous System (PNS) 31 pairs of spinal nerves and 12 cranial nerves outside the CNS

  2. I. Spinal Nerves Lead to and from the spinal cord Plexuses- “braid”, cluster of nerves except T2-T12

  3. I. Spinal Nerves • Cervical / brachial plexus- 8 nerves around the 7 cervical vertebrae • Thoracic- 12 nerves around 12 thoracic vertebrae; not a plexus • Lumbar- 5 nerves around 5 lumbar vertebrae; cauda equina- horse tail appearance • Sacral plexus- 5 nerves around sacrum • Coccygeal nerve- 1 nerve around coccyx

  4. I. Spinal Nerves F. 13 Spinal Nerve Branches To Know: 1. Phrenic- diaphragm 2. Axillary- circumflex shoulder 3. Ulnar- arm and hand muscles; senses 4. Median- “ 5. Radial- “ 6. Pudendal- perineal muscles in genitalia, senses

  5. I. Spinal Nerves F. 13 Spinal Nerve Branches To Know: 7. Femoral- leg muscles 8. Lateral Femoral Cutaneous- senses of thigh 9. Saphenous- towards patella, senses 10. Sciatic- largest nerve- ¾ in diameter, back thigh, muscles 11. Tibial- off sciatic, lower leg, senses 12. Common Peroneal- leg and foot muscles, senses 13. Medial Cutaneous- lower leg, senses

  6. II. Cranial Nerves Consist of bundles of axons Named based on primary function or structure that they serve A. Three Kinds- sensory, motor, mixed

  7. I. Olfactory II. Optic III. Oculomotor IV. Trochlear V. Trigeminal VI. Abducens VII. Facial II. Cranial Nerves B. Cranial Nerves to Know: I. Olfactory- smell- S II. Optic- vision- S III. Oculomotor- eye mover- M IV. Trochlear- eye mover- M V. Trigeminal- largest, chewing, sensation-B VI. Abducens- eye mover-M VII. Facial- taste, tears- B

  8. II. Cranial Nerves B. Cranial Nerves to Know: VIII-Vestibulocochlear- hearing, balance- S IX- Glossopharyngeal- taste, moves tongue- B X- Vagus- thoracic and abdominal cavities- B XI- Accessory- helps vagus nerve, larynx, pharynx, upper shoulder muscles- M XII- Hypoglossal-moves tongue- M VII. Vestibulocochlear IX. Glossopharyngeal X. Vagus XI. Accessory XII. Hypoglossal

  9. II. Cranial Nerves WAYS TO HELP YOU REMEMBER THE NERVES- On Old Olympus’ Towering Tops A Friendly Viking Grew Vines And Hops On Occasion Our Trusty Truck Acts Funny- Very Good Vehicle Any How

  10. II. Cranial Nerves • WAYS TO HELP YOU REMEMBER Sensory, Motor, or Both- • Some Say Marry Money But My Brother Says (its) Bad Business (to) Marry Money

  11. III. Two Divisions of the PNS A. Somatic Nervous System (SNS) 1. Regulates voluntary effectors to carry signal to the viscera 2. Regulates skeletal muscles 3. Somatic Motor Pathway- brain or SC  single motor neuron with myelin  synapse with Ach  skeletal muscle

  12. III. Two Divisions of the PNS B. Autonomic Nervous System (ANS) 1. Regulates involuntary effectors to carry signals to viscera 2. Regulate cardiac muscle, smooth muscle, and glandular epithelial tissue 3. 2 Divisions A. Sympathetic Division- Flight or Fight B. Parasympathetic Division- Rest and Repair

  13. Halare: to breathe Phil-: love Muc-: mucus Pulmo: lung Penia-: deficiency Alvus: belly Man- hand Nasus: nose Megalo-: large Dent: tooth Pleura: side Malaco: softening QUIZ Section 14 vocab

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