Flashcards in Posture/Motor Control Deck (35):
Sign - observable
symptoms: reported by patient
syndrome: clusters of signs/symptoms
what two brain areas help to refine movement initiated by motor cortex?
what is a motor unit?
the group of muscle fibers that are innervated by a single alpha motor neuron
muscle strength grows how neuronally?
incrementally, changes depending on how many impulses are sent
What is Henneman's size principle?
start recruiting small fatigue resistant motor neurons then larger fatiguable ones as you need more force
what is meant by a 'secure' motoneuron?
an impulse will definitely release ACh(NicR) and make it contract.
What is a fibrillation?
tiny contraction of single muscle cell
what is fasciculation?
groups of muscle fibres contracting involuntarily. usu from degen MN
what happens to muscle after long term denervation?
are muscles inactive? when are they?
usually not: resting tone
only during REM sleep
What encodes length of muscle fibres?
intrafusal muscle fibers
what encodes force in muscle?
golgi tendon organ
golgi tendon organ encodes?
intrafusal muscle fibres encode?
how to record muscle activity?
2 things come into play when catching a ball dropped from a height:
1. feedforward (anticipation)
2. feedback (adjustments)
anything between cotricospinal tract and alpha motor neuron?
usually local interneurons
spinal cord gray matter, what is medial? what is laterl?
what happens in the brainstem with the corticospinal tract?
collaterals to reticular formation
what does the lateral and medial vestibulospinal tracts do?
what does reticulospinal tract do?
what does colliculospinal tract do?
helps with orienting reflex of sight
pattern generators are usually located where?
all in the spinal cord, eg. stepping reflex/gait cycle
what happens to decerebrate cat gait when treadmill speed increased?
sensory feedback of muscle length to spinal cord allows speed to increase
ataxic gait affected where?
Which pathways for:
1. Voluntary movements
1. lateral descending
2. medial descending
extended upper and lower limbs, arched back
flexed upper limbs, extended lower limb
lesion above red nucleus you get?
below red nucleus you get?
intact rubrospinal tract from red nucleus causes what?
upper limb flexors: decorticate