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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 |