Term
| CN 1 Olfactory 1st Order Pathway |
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Definition
- Bipolar neurons
- Axon passing through cribriform plate of the ethmoid bone, synapse in the olfactory bulb with 2nd order neuron forming Olfactory Tract
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Term
| CN 1 Olfactory final locations |
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Definition
- Primary olfactory cortex
- Limbic system
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Term
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Definition
- Fibers from optic chiasm --> lateral geniculate nucleus (LGN) of thalamus
- 10% of visual info travels to superior colliculus and hypothalamus rather than the LGN
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Term
| CN 2 Optic Radiations (thalamus --> visual cortex) |
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Definition
- Fibers carrying info from the superior visual fields travel in the inferior optic radiations through the temporal lobe prior to heading posteriorly to the lower bank of the calcarine fissure in the primary visual cortex
- Fibers carrying info from the inferior visual fields travel in the superior optic radiations through the parietal lobe to the upper bank of the calcarine fissure in the primary visual cortex
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Term
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Definition
- Nuclei in midbrain tegmentum (level of superior colliculus)
- Exit at interpeduncular fossa
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Term
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Definition
- Nucleus in midbrain tegmentum (at level of inferior colliculus)
- Only CN that exits on the dorsal side!
- exits at junction of midbrain and pons
- Only CN where all fibers cross!
- Left nucleus controls right eye, but left nerve controls left eye
- Right nucleus controls left eye, but right nerve controls right eye
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Term
| CN 5 Trigeminal Motor Nucleus |
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Definition
- Voluntary motor neuron cell bodies for control of jaw movement in the the motor nucleus of CN 5
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Term
| CN 5 Trigeminal 1st order cell bodies |
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Definition
- Cell bodies of 1st order neurons in Trigeminal Ganglion except proprioception
- Proprioception 1st order cell bodies in lateral midbrain mesencepalic nucleus (exception to the rule that sensory neuron cell bodies are located outside the CNS)
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Term
| CN 5 Trigeminal 2nd Order Cell Bodies |
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Definition
- Discriminative Touch
- principal/main/chief sensory nucleus in Pons
- Pain, Temp, Crude Touch
- spinal trigeminal nucleus in Caudal Medulla
- Axons for conscious sensation cross midline and project to thalamus via Ventral Trigeminothalamic Tract (TTT)
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Term
| CN 5 Trigminal 3rd Order Cell Bodies |
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Definition
- Cell bodies of 3rd order neurons in the ventral posteromedial nucleus (VPM) of the thalamus
- 3rd order neurons project to the face region of the primary somatosensory cortex
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Term
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Definition
- Nucleus located medially in the tegmentum of Caudal Pons
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Term
| CN 7 Facial Motor Nucleus |
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Definition
- Voluntary motor nucleus in Caudal Pons
- Parasympathetic nuclei in Caudal Pons
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Term
| CN 7 Facial Special Sense 2nd Order Neurons |
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Definition
- 2nd Order neurons project to VPM of the thalamus bilaterally
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Term
| CN 7 Facial Somatosensory Cell Bodies |
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Definition
- 1st order cell bodies in the facial ganglion
- 2nd order neurons in spinal nucleus of CN 5
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Term
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Definition
- Info from vestibular apparatus goes to vestibular nuclei (caudal pons and rostral medulla), to the cerebellum, and to the reticular formation
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Term
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Definition
- Displacement of endolymph --> bending of hair cells --> depolarization of neurons in CN 8 -->cochlear nuclei in caudal pons at junction of pons and medulla --> 2nd order neurons ascend bilat
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Term
| CN 9 Glossopharyngeal Sensory Nuclei |
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Definition
- Somatosensory
- 2nd order neurons in spinal nucleus of CN 5
- Special Sensory
- 2nd order neurons in nucleus in rostral medulla
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Term
| CN 9 Glossopharyngeal Motor Nuclei |
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Definition
- Parasympathetic
- Voluntary Motor
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Term
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Definition
- Voluntary Motor
- Parasympathetic
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Term
| CN 10 Vagus Sensory Nuclei |
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Definition
- Somatosensory
- 2nd order neurons in the spinal nucleus of CN 5
- Special Sensory
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Term
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Definition
- Portion of nucleus in lateral aspect of ventral horn C1-C5
- Axons exit spinal cord between the dorsal and ventral roots, travel superiorly outside of CNS, go up through the foramen magnum into the skull, join with the cranial portion, then exit the skull to the trapezius and SCM
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Term
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Definition
- Nuclei medial tegmentum of the medulla
- Exits brainstem in the ventrolateral sulcus (groove between the pyramid and the olive)
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