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Brainstem I: Surface Anatomy and Cranial Nerves

6 important questions on Brainstem I: Surface Anatomy and Cranial Nerves

What is the Foster Kennedy Syndrome?

large lesion olfactory sulcus region in which anosmia & optic atrophy in one eye is present, papilledema (optic disc swelling caused by ICP) in other eye.

Of which 3 nuclei does the trigeminal nuclear complex exist?

1. Chief trigeminal sensory nucleus: receives input fine touch & dental pressure
2. Spinal trigeminal nucleus: sensory systems for face, head, crude touch, pain & temperature sense.
3. Mesencephalic: mediates propioception, primary sensory neurons, lies in CNS in stead of peripheral ganglia

Lesion trigeminal nuclei in brainstem?

ipsilateral loss of facial sensation because sensory fibers do not cross before entering the nucleus.

Lesion trigeminal nuclei in pons or medulla?

sensory loss, pain & temperature ipsilateral fase part but contralateral in body.

Why does de upper part of the face gets spared with an UMN lesion and is the whole face affected with an LMN lesion?

Both hemisphere contribute to movement of the upper face, so there is compensation. Only one hemisphere controls te lower face, so the whole face is affected.

What is Bell's Palsy?

most common facial nerve disorder. All divisions of facial nerve impaired within hours and then recover. Viral or inflammatory.

The question on the page originate from the summary of the following study material:

Neuroscience and Neuroanatomy

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