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Anatomy - Exam 3
Peripheral Nervous System
| Question | Answer |
|---|---|
| The Peripheral Nervous System is... | Portion of the nervous system outside the central nervous system |
| The PNS conveys ... | impulses to and from brain & spinal cord |
| 2 types of nerves | cranial & spinal |
| Sensory Nervous | Towards CNS |
| Mixed Nerves composed of... | sensory & motor neurons! |
| Cranial Nerves - how many pairs arise from the forebrain? from midbrain & brainstem? Most are? and osme are ONLY? | forebrain - 2 midbrain & brainstem - 10 most are MIXED some are ONLY sensory! |
| On Old Olympus Towering Tops A Fin And Greek Viewed Some Hops | Olfactory, Optic, Ocularmotor, Trochlear, Trigeminal, Abducens, Facial, (Acoustic) Vestibulocochlear, Glossopharyngeal, Vagus, (Spinal) Accessory, Hypoglossal |
| Olfactory Nerve I | - bipolar neurons - CHEMORECEPTORS - Axons pass through cribiform plate of ethmoid - SYNAPSE at olfactory bulb - ONLY SENSE THAT DOESN'T PASS THROUGH THALAMUS - 2 olfactory bulbs, divided by cristi galli |
| Optic Nerve II | - Sensory Nerve - PHOTORECEPTORS - Cross at optic chiasma |
| Oculomotor III | - Produce extrinsic and intrinsic movements of eyeball - Innervates all eye muscles except 2 (Superior rectus, medial rectus, inferior rectus, inferior oblique, levator palpebra (to raise eyelid) - Ciliar muscles control movement of pupil |
| Trochlear |