Neuro Test 3 part 3 Flashcards
What is the function of The vermis?
Vermis–Postural Adjustments
What is the purpose of the Vestibulocerebellum?
Receives input from the vestibular receptors and is involved with the maintenance of balance and regulation of head and eye movements.
What is the function of the paravermis?
Adjusts movements while movements are happening.
It compares the commands from the motor cortex with the actual position and velocity of the moving part. It then issues correcting signals.
What is the function of the lateral zone?
Planning of movement by influencing the output of the motor cortex.
Current theory helps in programming and planning of movement.
What are the different types of circuitry that come from the superior cerebellar peduncle?
What is the prefix that these output usually have?
Dentate, Emboliform, Globose.
Dentato–
dentatorubral, dentatothalamic, dentatoreticular
What is Anterior Lobe Syndrome?
Postural instability caused by malnutrition from chronic alcoholism. Ataxia in the legs in all conditions. Person compensates by using a wide base of support and has a staggering gait pattern. The motor control is better sitting than standing.
What does ataxia look like with damage to the vermis and paravermis?
(Midline damage)
Anterior lobe syndrome.
Ataxia is present in the legs, even when the trunk is supported. Motor control is better sitting than standing.
Person compensates by using a wide base of support with a staggering gait pattern.
What does ataxia look like with damage to the lateral hemisphere?
Neocerebellar syndrome.
Limb Ataxia.
many different combinations and changes in muscle tone, reflexes, and coordination of voluntary movement. These changes change constantly. All are ipsilateral to the lesion.
Know what a small lesion of a cerebral hemisphere looks like. 3
A small lesion of the hemisphere…Neocerebellar Syndrome…limb ataxia, would give the following…
Hypotonia–floppy limbs with little resistance to passive motion.
Hyporeflexia–a reduction of stretch reflexes. (knee doesn’t kick back)
Pendular reflexes–After a reflex contraction, a limb may sway back and forth rather than coming to a natural, quick stop.
Know what a large lesion of a cerebellar hemisphere looks like.
Voluntary movement–no coordination due to a deficit in movement timing and velocity.
Movement takes longer to initiate and is slow to stop or change direction. This is seen through…
Dysmetria–overshooting or undershoorting the target.
Intentional Tremor–“Tremor with corrective movments when reaching a target”
Senasation “feels” normal.
Describe damage to the lateral zone of cerebellum
Neocerebellar syndrome. Variable combinations of changes in muscle tone, reflexes, and coordination of voluntary movements. Dysmetria Intentional tremor Hypotonia Hyporeflexia Pendular Reflexes
Describe damage to the floccular lobe of cerebellum
Medulloblastomas from tumors in children.
Loss of equilibrium–
sway back and forth when standing
walk with staggering wide-based gait.
Falls easily when walking.
Variety of eye movement difficulties (eye tracking damage)
NO TREMOR. When sitting or lying, extremity movement is normal.
Reflexes and tone are normal
Describe damage to the Vermis of the cerebellum
(Midline damage)
Anterior lobe syndrome.
Ataxia is present in the legs, even when the trunk is supported. Motor control is better sitting than standing.
Person compensates by using a wide base of support with a staggering gait pattern.
Describe damage to the Anterior lobe of cerebellum.
(Midline damage)
Anterior lobe syndrome.
Ataxia is present in the legs, even when the trunk is supported. Motor control is better sitting than standing.
Person compensates by using a wide base of support with a staggering gait pattern.
Define Dysmetria
Define Intentional Tremor
Both occur from major hemispherical lesions.
Dysmetria–overshooting or undershooting the target a person wants to touch or hold.
Intentional Tremor–“tremor with corrective movements when reaching a target.” These tremors happen when the patient intentionally wants to touch something, not when they are at rest. Remains ipsilateral.
