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Cranial Nerves
Biology
| Question | Answer |
|---|---|
| Olfactory | Olfactory Epithlium- Cribriform Plate of ethmoid bone- to synapse in olfactory bulbs Function: Carries afferent impulses associated with sense of smell. Test: Sniffing different aromas, and identifying each. |
| Olfactory | Olfactory Epithlium- Cribriform Plate of ethmoid bone- to synapse in olfactory bulbs Function: Carries afferent impulses associated with sense of smell. Test: Sniffing different aromas, and identifying each. |
| Optic | Retina of eye- Through optic nerve and canal of orbit- across optic chasima- and finally from the thalamus to the visual cortex as optic radiation. Function: Carries afferent impulses associated with vision. Test: Visual field is determined with eye cha |
| Oculomotor | Dorsal Midbrain- Enters orbit- Exits skull through superior orbital fissure. Function: Helps direct the eyeball, constrict pupils, and connects eyeball to the brain. (Somatic, Parasympathetic, Sensory) Testing: Pupils are examined for size, shape, and e |
| Trochlear | Midbrain- Exits from skull through superior orbital fissure. Function: Helps move the eyeball. Test: Tested with the oculomoter nerve. |
| Trigeminal | From face to pons in three divisions. Function: Sensory nerve to the face and scalp, nose and floor of mouth. Test: Rub a cotton ball across the face to test senses. |
| Abducens | Leaves inferior pons-enters orbit through superior orbits fissure- to run to eye. Function: Carries somatic fibers to rectus muscle that helps move the eyeball. Test: Test with oculomotor nerve. |
| Facial | Leaves pons- travels through temporal bone- exiting through stylomastoid foramen to reach the face. Function: Supplies motion to the face, facial expression, motion to the salivary glands, and sense to the taste receptors to the tongue. |
| The term DORMATOMES | Dormatomes are parts of the skin that can only be innovatated by cranial nerve 5, it's for sensation in the face. |
| Plexuses | There are no plexuses at the thorax, they're a network of converging and diverging nerve fibers, blood vessels or lymphatics. |
| Why are Phrenic Nerves important | They're the only nerve that innovates the diaphragm, the muscle that takes in air. The ones vital to live are C3, C4, and C5. |
| Vestibulocochlear | Inner Ear Equilibrium/ Hearing apparatus-Through internal acoustic meatus- to enter pons. Function: Transmits impulses associated with the sense of hearing from the cochlea. Test: Hearing is tested by air and bone conduction using tuning fork. |
| Glossopharyngeal | Medulla- leaves skull through the jugular foramen- and runs to the throat. Function: Innovates part of the tongue and pharynx, helps with swallowing, taste, and chemoreceptors. Test: Check gag reflexes through uvula, ask to speak and cough. |
| Vagus | Medulla- descends through neck region into thorax and abdomen. Function: Carries somatic motor impulses to various places in the body. |
| Accessory | |
| Hypoglossal |
Created by:
tallen149