Organization of the Pons Flashcards
A lesion of which structure/tract would likely result in contralateral ataxia and tremor?
Red Nucleus/rubrospinal tract
Ipsilateral ataxia and dysmetria would result from what type of lesion?
Cerebellum (projects to contralateral red nucleus which projects contralaterally again -> ipsilateral)
What nerve carries cutaneous inputs from the face? What is/are following steps in the pathway?
Trigeminal nerve, principal sensory trigeminal nucleus, rostral spinal trigeminal nucleus. Then crosses the midline and ascends to the thalamus through the ventral trigeminothalamic tract to VPM.
Pain information from the face is carried by which nerve? What is/are the following steps in the pathway?
Trigeminal Nerve, Caudal 2/3 of spinal trigeminal nucleus then crosses the midline to the ventral trigeminothalamic tract to VPM.
Which cranial nerves carry noxious stimuli in the neck, face and head? What is/are the destination nucleus/nuclei for this pain information?
V, VII, IX, X. Spinal trigeminal nucleus.
Which nucleus/nuclei are involved in the corneal reflex?
spinal trigeminal nucleus, facial nucleus
Which nucleus/nuclei are involved in the swallowing/gag reflex?
spinal trigeminal nucleus, hypoglossal nucleus, nucleus ambiguus
Give the syndrome and symptoms that would likely result from a lesion of the facial nerve at the stylomastoid foramen.
Bell’s Palsy, Ipsilateral facial paralysis, Inability to close eye, Difficulty chewing food, loss of corneal reflex.
What are the two nuclei that appear at the same rostro/caudal level where the fibers of one wraps around the other nucleus?
Facial, Abducens nuclei
A stroke of the basilar near cranial nerve VI would produce what syndrome? What are its symptoms?
Medial alternating hemiplegia. Ipsilateral lateral rectus palsy (abducens nerve). Contralateral hemiplegia (corticospinal tract)
