Term
| How many pairs of cranial nerves originate in the brain? |
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Definition
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Term
| Order of cranial nerves (1-12)? |
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Definition
I: olfactory
II: optic
III: oculomotor
IV: trochlear
V: trigeminal
VI: abducens
VII: facial
VIII: vestibulocochlear
IX: glossopharyngeal
X: vagus
XI: spinal accessory
XII: hypoglossal |
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Term
| Fibres present in Cranial Nerve I? |
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Definition
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Term
| Function of Olfactory Nerve? |
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Definition
| Conscious perception of smell |
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Term
| Where are the chemoreceptors located that transmit sensory info to Cranial Nerve I? |
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Definition
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Term
| Where is the nucleus for the Olfactory Nerve located? |
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Definition
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Term
| Test for Cranial Nerve 1 Function? |
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Definition
| No test reported. Animals may sniff without perceiving odour- reason its hard to tell |
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Term
| Fibres present in the Optic Nerve? |
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Definition
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Term
| Which cells form the axons in the optic nerves? |
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Definition
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Term
| Point of convergence for the paired Cranial Nerve 2s? |
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Definition
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Term
| What paired structures leave the optic chiasm that ensure the function of Cranial Nerve 2? |
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Definition
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Term
| Where do the fibres for conscious perception of vision synapse? |
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Definition
| Lateral Geniculate Nucleus |
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Term
| Where do the fibres for unconscious response to visual stimuli synapse? |
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Definition
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Term
| What 2 tests are used to determine the function of the Optic Nerve? |
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Definition
| Pupillary Light Reflex and Menace Response |
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Term
| How do you conduct a direct pupillary light reflex? |
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Definition
| Shine light into the eye and observe constriction in the same eye. |
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Term
| How do you conduct a menace response test? |
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Definition
| Cover one eye, make a menacing response at the other eye. Normally the animal will blink in response. |
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Term
| Clinical Disease noted with Cranial Nerve 2 damage? |
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Definition
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Term
| Function of the Oculomotor Nerve? |
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Definition
| Control of iris constriction muscles. Motor innervation of some extraocular muscles |
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Term
| Location of nuclei associated with Cranial Nerve 3? |
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Definition
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Term
| Notable clinical signs that may be associated with the Oculomotor Nerve? |
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Definition
| Ventrolateral Strabismus, Anisocoria/Abnormal PLR |
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Term
| Function of Cranial Nerve IV? |
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Definition
| Motor innervation of the dorsal oblique muscle of the eye |
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Term
| Location of the nucleus for the Trochlear Nerve? |
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Definition
| Caudally in the mesencephalon |
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Term
| Exam that can be done for Cranial Nerve IV lesions? |
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Definition
| Fundus Exam: use a fundoscope to look for rotation |
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Term
| Signs of Trochlear Nerve damage? |
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Definition
| Mild dorsolateral strabismus, Abnormal eye movement when head is moved, Rotation of fundus (only visible with fundoscope) |
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Term
| Fibres present in the Trigeminal Nerve? |
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Definition
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Term
| Function of the sensory portion of Cranial Nerve V? |
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Definition
| Innervates the face (pinnae, eyelids, cornea, oral cavity, mucosa of nasal septum) |
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Term
| Function of the motor portion of the Trigeminal Nerve? |
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Definition
| Innervates muscles involved with mastication |
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Term
| Where are the nuclei of Cranial Nerve V located? |
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Definition
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Term
| 3 branches of the sensory nucleus of the Trigeminal nerve? |
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Definition
| Opthalamic branch, Maxillary branch, Mandibular branch |
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Term
| Function of Opthalamic branch of Cranial Nerve V nucleus? |
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Definition
| Innervates ocular region and the medial canthi |
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Term
| Function of Maxillary branch of Trigeminal Nerve nucleus? |
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Definition
| Innervates the nasal region and lateral canthi |
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Term
| Function of Mandibular branch of Cranial Nerve V nucleus? |
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Definition
| Innervates the buccal area |
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Term
| The sensory component of the Trigeminal Nerve nucleus has a ganglion called _____________? |
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Definition
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Term
| Clinical exam for Trigeminal Nerve dysfunction? |
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Definition
| Palpebral reflex, check jaw tone, look for symmetrical response to stimulation of the nasal mucosa |
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Term
| Clinical disease associated with Cranial Nerve V? |
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Definition
| Motor loss in the masseter, temporalis muscle wasting, loss of jaw tone. Sensory loss in absent palpebral reflex, lack of sensation in the face |
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Term
| Function of the Abducens Nerve? |
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Definition
| Innervates the lateral rectus and retractor bulbi muscles |
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Term
| Location of the Cranial Nerve VI nucleus? |
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Definition
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Term
| How can you tell by clinical examination that there is a problem with the Abducens Nerve? |
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Definition
| Medial strabismus and loss of lateral gaze, look for the eye to be retracted, allowing the third eyelid to be extruded |
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Term
| Fibres making up the Abducens Nerve? |
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Definition
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Term
| Fibres making up the Facial Nerve? |
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Definition
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Term
| Which cranial nerves have parasympathetic involvement? |
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Definition
| Oculomotor Nerve, Facial Nerve, Glossopharyngeal Nerve, Vagus Nerve |
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