1. Peripheral Nervous System Includes: 1.Cranial nerves 2.Spinal nerves Can also be divided into: 1.Somatic nervous system – controls conscious activities 2.Autonomic nervous system – controls unconscious activities

2. Cranial Nerves Where would these originate? 12 pairs – 1 st pair originates in the cerebrum – The rest originate from the brain stem

3. Cranial Nerves, continued….. 1.Olfactory nerves (I) 2.Optic nerves (II) 3.Oculomotor nerves (III) 4.Trochlear nerves (IV) – smallest; takes impulses to a muscle that moves the eye 5.Trigeminal nerves (V) – largest cranial nerves 1.Ophthalmic division – sensory info from eyes 2.Maxillary division – sensory info from upper mouth 3.Mandibular division – sensory info from scalp behind ears and lower mouth

4. Cranial Nerves, continued….. 6.Abducens nerves (VI) – small; motor impulses to move eye 7.Facial nerves (VII) – 1.Sensory associated with taste receptors 2.Motor impulses to facial muscles and tear glands and salivary glands 8.Vestibulocochlear nerves (VIII) – inner ear 1.Vestibular branch – maintaining balance 2.Cochlear branch - hearing

5. Cranial Nerves, continued….. 9.Glossopharyngeal nerves (IX) – tongue and pharynx; swallowing 10. Vagus nerves (X) – 1.Larynx muscles associated with speech and swallowing 2.Supplies muscles of the heart and smooth muscles and glands in thorax and abdomen – Vasovagal response

6. Cranial Nerves, continued….. 11. Accessory nerves (XI) – originate in the medulla oblongata AND spinal cord, so has cranial AND spinal branches 1.Cranial branches – join a vagus nerve and carry impulses to muscles of soft palate, pharynx, and larynx 2.Spinal branches – motor impulses to trapezius and sternocleidomastoid muscles 12. Hypoglossal nerves (XII) – motor impulses to tongue

7. Spinal Nerves Thirty-one pairs providing 2-way communication between spinal cord and parts of upper and lower limbs, neck, and trunk Divided into: 1.Cervical nerves 2.Thoracic nerves 3.Lumber nerves 4.Sacral nerves 5.Coccygeal nerves – Naming and how many of each????

8. Autonomic Nervous System Two divisions: – Sympathetic division – prepares body for stressful situations – Parasympathetic division Most active under ordinary conditions Counterbalances sympathetic division

9. Cranial Nerves Mnemonic Devices Naming: O! O! O! There’s The Abercrombie and Fitch. Very Gorgeous and Very Adorable! Hot! Type of Nerve: Some Say Money Matters, But My Brother Says Big Boobs Matter More.