the peripheral nervous system (pns)
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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 cordPlexuses- “braid”, cluster of nerves
except T2-T12
I. Spinal NervesA. Cervical / brachial plexus- 8 nerves
around the 7 cervical vertebraeB. Thoracic- 12 nerves around 12 thoracic
vertebrae; not a plexusC. Lumbar- 5 nerves around 5 lumbar
vertebrae; cauda equina- horse tail appearance
D. Sacral plexus- 5 nerves around sacrumE. Coccygeal nerve- 1 nerve around
coccyx
I. Spinal NervesF. 13 Spinal Nerve
Branches To Know:1. Phrenic- diaphragm2. Axillary- circumflex
shoulder3. Ulnar- arm and hand
muscles; senses4. Median-
“5. Radial-
“6. Pudendal- perineal
muscles in genitalia, senses
I. Spinal Nerves
F. 13 Spinal Nerve Branches To Know:7. Femoral- leg muscles8. Lateral Femoral Cutaneous- senses of thigh9. Saphenous- towards patella, senses10. Sciatic- largest nerve- ¾ in diameter, back thigh, muscles11. Tibial- off sciatic, lower leg, senses12. Common Peroneal- leg and foot muscles, senses13. Medial Cutaneous- lower leg, senses
II. Cranial NervesConsist of bundles of axonsNamed based on primary function or structure that
they serveA. Three Kinds- sensory, motor, mixed
II. Cranial NervesB. Cranial Nerves to Know:
I. Olfactory- smell- SII. Optic- vision- SIII. Oculomotor- eye mover- MIV. Trochlear- eye mover- MV. Trigeminal- largest, chewing,
sensation-BVI. Abducens- eye mover-MVII. Facial- taste, tears- B
I. Olfactory
II. Optic
III. Oculomotor
IV. Trochlear
V. Trigeminal
VI. Abducens
VII. Facial
II. Cranial NervesB. 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
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
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
III. Two Divisions of the PNSA. Somatic Nervous System (SNS)
1. Regulates voluntary effectors to carry signal to the viscera
2. Regulates skeletal muscles3. Somatic Motor Pathway-
brain or SC single motor neuron with myelin synapse with Ach skeletal muscle
III. Two Divisions of the PNSB. 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 DivisionsA. Sympathetic Division- Flight or FightB. Parasympathetic Division- Rest and Repair
QUIZ Section 14 vocab1. Halare: to breathe2. Phil-: love3. Muc-: mucus4. Pulmo: lung5. Penia-: deficiency6. Alvus: belly7. Man- hand8. Nasus: nose9. Megalo-: large10. Dent: tooth11. Pleura: side12. Malaco: softening