Brainstem nuclei lesions Flashcards
lesion in: Motor Nucleus of V
Ipsilateral paralysis and atrophy of the muscles of mastication; diminished jaw- jerk reflex
lesion in: Motor Nucleus of VII
Ipsilateral facial palsy; loss of corneal reflex
lesion in: Nucleus Ambiguus
Dysarthria, dysphagia, hoarseness,
Deviation of the uvula away from the affected nucleus
lesion in: Edinger-Westphal Nucleus
Pupillary dilation and difficulties in accommodation
lesion in: Superior Salivatory Nucleus
Ipsilateral loss of lacrimation from the lacrimal gland
lesion in: Dorsal Motor Nucleus of X
Transient parasympathetic deficits
lesion in: Oculomotor Nucleus
External strabismus, complete ptosis
lesion in: Trochlear Nucleus
Gaze of the contralateral eye is directed down and out. Because the trochlear nerve completely decussates before leaving the midbrain, the head tilts towards the side of the affected nucleus.
this means if the lesion is on the right, the affected eye is on the left, and they will tilt down toward the right
lesion in: Abducens Nucleus
Ipsilateral paralysis of lateral gaze; internal strabismus
lesion in: Hypoglossal Nucleus
Ipsilateral paralysis and atrophy of the intrinsic muscles of the tongue
Protruded tongue deviates towards the side of the affected nucleus
lesion in: Mesencephalic Nucleus of V
Ipsilateral loss of proprioception from 1⁄2 of the head; diminished jaw jerk reflex
lesion in: Main Sensory Nucleus of V
Ipsilateral loss of fine proprioception and two-point tactile discrimination from 1⁄2 of the face
lesion in: Descending Nucleus of V
Ipsilateral loss of pain and temperature sensations from 1⁄2 of the face
lesion in: Solitary Nucleus
Ipsilateral loss of taste sensations from the tongue and oropharynx; diminished or absent visceral pain sensations or reflexes from the ipsilateral palate and pharynx
lesion in: Vestibular Nuclei
Problems with equilibrium and posture; nystagmus
