know it Flashcards
what are two functions of the corticoreticulospinal pathway?
fractionated movement and activating reticular formation in anticipation of the fractionated movement.
what do the raphespinal, cerulospinal, spinomesencephalic, and spinoreticular pathways all have in common?
they all play a role in modulating incoming pain stimuli
symptoms of LMN lesions
flaccid paralysis, atrophy, hyporeflexia, areflexia, fassiculations
symptoms of UMN lesions
initial flaccid paralysis, weakness (paresis, plegia), abnormal cutaneous reflexes, abnormal reflexes, spasticity, abnormal timing,
what is the purpose of all the cross communicating before signal from CN VIII reaches the cortex?
localization of sound
what would a lesion of CN VIII present as?
loss of localization of sound if lesion is unilateral, ipsilateral deafness will occur if both cochlear nuclei or the CN is damaged
what are some of the symptoms of an acoustic neuroma?
vertigo, tinnitus, spinning sensation. It is a tumor that grows between cochlea and brain stem.
what muscles does the cranial component of CN XI innervate?
laryngeal
what muscles do the LMN of CN X innervate?
soft palate, larynx, pharynx, and vocalis muscles
what are some important features of solitary nucleus?
CN XII gets some indirect information concerning taste from it and the sensory fibers or CN X end here
a lesion of CN X would result in both _______ and ________deficits
motor and sensory
a unilateral lesion of LMN of CN X results in?
difficulty swallowing, hoarseness, inability to raise the soft palate on ipsilateral side
CN IX carries the afferent limb for which reflexes?
carotid sinus, gag, vomiting, and swallowing
