Cranial Nerves Flashcards
What is the location of Cranial Nerve 1 (Olfactory)?
Location:
- Doesn’t come from the brainstem
- It’s an extension from the Diencephalon
- Olfactory tract runs on the ventral surface of the front lobe then forms the olfactory bulb
- The nerves are filaments which come away from the olfactory bulb
What is the foramen of Cranial Nerve 1 (Olfactory)?
Foramen:
- Little holes in the cribriform plate
What is the function of Cranial Nerve 1 (Olfactory)?
Function:
- Smell (Olfaction)
What is a good way to test for a working Olfactory nerve?
Test:
- Offer a familiar smelling item (an orange for example)
What is the location of Cranial Nerve 2 (Optic)?
Function:
- Derived from the forebrain
- Travel from the eyeball to meet (on the most anterior tip of the hypothalamus) to form the optic chiasm
- They then spread out laterally and form the optic tracts
What is the foramen of Cranial Nerve 2 (Optic)?
Foramen:
- The optic canal
What is the function of Cranial Nerve 2 (Optic)?
Function:
- Vision
What is a good way to test for a working optic nerve?
Test:
- Various visual tests
What is the location of Cranial Nerve 3 (Oculomotor)?
Location:
- Pontomesencephalic junction
- Between the two cerebral peduncles
- This is known as the interpeduncular fossa
What is the foramen of Cranial Nerve 3 (Oculomotor)?
Foramen:
- Superior Orbital fissure
What is the function of Cranial Nerve 3 (Oculomotor)?
Function:
- 4 out of 6 of the optic muscles (not lateral rectus or superior oblique)
What is a good way to test for a working oculomotor nerve?
Test:
- Follow finger test
What is the location of Cranial Nerve 4 (Trochlear)?
Location:
- Dorsal of the midbrain
- Inferior to the inferior colliculi
What is the foramen of Cranial Nerve 4 (Trochlear)?
Foramen:
- Superior orbital fissure
What is the function of Cranial Nerve 4 (Trochlear)?
Function:
- Superior oblique muscle of the eye
What is a good way to test for a working trochlear nerve?
Test:
- Follow finger test
What is the location of Cranial Nerve 5 (Ophthalmic; Maxillary and Mandibular)?
Function:
- The brainstem, just as the pons does, becomes the idle cerebellar peduncle
- Made of 3 divisions
What is the foramen of The Ophthalmic Nerve?
Foramen:
- Superior orbital fissure
What is the foramen of The Maxillary Nerve?
Foramen:
- Foramen rotundum
What is the foramen of The Mandibular Nerve?
Foramen:
- Foramen Ovale
What is the function of The Ophthalmic Nerve?
Function:
- Sensation from upper portion of the face (skin around the eye)
- Sensory fibres
What is the function of The Maxillary Nerve?
Function:
- Sensation from middle portion of the face
- Sensory fibres