Lecture 19 Flashcards
What happens if your cerebellum is not functioning to capacity
~1 year cerebellar afferents are not myelinated- poor coordination of movements
-if damage cerebellum- loss of ability to generate coordinated movements
Describe symptoms associated with lesions to the intermediate hemisphere
-ipsi-lateral symptoms
-pendular reflexes: inability to modulate reflexes, lack of check or a singular response, normal amplitude of response but swings to a stop
-ataxia involving:
-dysrythmia: abnormal timing of movement
-dysmetria: abnormal amplitude of movement, overshooting and undershooting, abnormal trajectories of movement
-intention (action) tremor: tremor during voluntary movement. postural tremor, no tremor at rest, worst at end points of movement
-dysdiadochokinsia: difficulty with alternating movements
-dysarthria: poor flow and rhythm of speech, e.g. sluredm drunken like, irregular volume and tone, explosive speech
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Describe testing for lesions of intermediate hemisphere
-finger-nose-finger test, point touch finger and back to nose as quickly and accurately as possible
-for leg: heel to shin test- heal run down chin of other leg
Describe symptoms of damage to midline (primarily vermis)
-ataxia of axial muscles including proximal leg (hip) and trunk (during sit and stand)
-broad based, staggering gait (ataxic gait)
-poor standing balance
-caused by chronic alcoholism (and combined with malnutrition): leading to anterior lobe syndrome/degeneration
Describe symptoms associated with flocculo-nodular obe damage
-unstable when standing and walking (note leg movements are normal when seated or reclined)- deficits in vestibular coordination, and balance and gait when upright and walking
-Difficulty with visual tracking or moving objects: cerebellum coordinate saccadic rhythm, may lead to saccadic dysmetria when moving eye between targets, also see poor coordination with smooth pursuit movements
-Inability to suppress VOR
