Chapter 13: Motor Systems and Movement Flashcards
What binds to receptors on the motor end plate?
Acetylcholine
What condition is a condition in which antibodies (immune proteins) block, alter, or destroy the receptors for acetylcholine at the neuromuscular junction, which prevents the muscle from contracting?
Myasthenia gravis
Which tract innervate neck, trunk and proximal limb extensor muscles for maintaining balance?
Vestibulospinal
Which brainstem nucleus is related to the tract that controls muscles responsible for reflex movements of the trunk?
Superior colliculus
Does damage to the UMN result in hypertonicity due overactivity of the gamma motor neurons?
Yes it does
Which disorder often presents with significant emotional/psychological changes?
Huntingtons disease
Which condition often affects both UMN and LMN
ALS
Dysmetria is a sign of damage to which functional area of the brain?
Cerebrocerebellum
In general, excess dopamine will result in?
Dyskinesia
After the cell depolarizes what ions trigger a muscle contraction?
Ca ions calcium
What does a motor unit consist of?
A single motor neuron and all of the muscle fibers it innervates
What is the motor homunculus responsible for?
organizing the brain so that areas of the body performing lots of fine movements have a large space in the motor cortex.
Does polio affect upper or lower motor neurons?
lower motor neurons
What kind of tone do patients with ALS have?
they have a mixture of flaccid and spastic paralysis.
What do lesions in the cerebellum result in?
Ataxia (uncoordinated movement)
