Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
28 Cards in this Set
- Front
- Back
|
To do an action, it requires four things
|
Motivation, Idealation, Programming and exection
|
|
|
Motivation arises from the
|
Limbic System
|
|
|
Control circuits do
|
regulating the activity of the decending motor tracts
|
|
|
Voluntary movements are processed from the
|
Post-central Gyrus (or motor cortex)
|
|
|
A single muscle fiber has many bundles
|
myofibrils
|
|
|
The myofibrils contains long series of sacromeres with
|
actin and myosin
|
|
|
.........is an active shortening of the muscle due to sliding of actin filament.
|
Muscle contractions
|
|
|
_____ is the amount of stiffness in resting muscles, and is regulated by intristic muscle properties, passive muscle properties, dsecending motor signals and proprioceptive information from the muscle spindles.
|
Muscle tone
|
|
|
Joint stiffness can be incvreased by
|
Cocontractions (stabilizes a joint)
|
|
|
Lower motor Neurons directly innervate ___
|
skeletal muscle fibers
|
|
|
______have axons travel in decending tracts (from the cortex to spinal cord or brainstem)
|
Upper Motor Neurons
|
|
|
Descending tracts are classified as ______movement tracts
|
postural/gross movement tracts, the fine movement and limb flexion tracts, and non-specific UMN tracts
|
|
|
Lower Motor Neurons have their cell bodies in the _____
|
Spinal Cord or Brainstem
|
|
|
Upper motor Neurons arise form the
|
Cerebral Cortex or brainstem
|
|
|
the control circuits are
|
the basal ganglia and cerebellum
|
|
|
A motor Neuron is a type of ___ cell
|
Nerve
|
|
|
______ are types of cells located in the spinal cord
|
Anterior Horn Cells
|
|
|
the two types of Lower Motor Neurons are
|
Alpha and Gamma motor nerurons
|
|
|
the difference between Alpha and Gamma motor neurons
|
Alpha has large cell bodies and large myelinated axons, while gamma has medium sized mylinated axons
|
|
|
slow twithced fibers are for____ & ___, while Fast Twitch fibers are for ___
|
posture and tonic contraction, phasic contractions
|
|
|
when the Alpha motor neurons are activated, the ____ neurotransmitter is released into the neuromuscular junction and all muscle fibers innervated by that neuron will contract
|
Acetylcholine (Ach)
|
|
|
Lack of Ach will create
|
Myasthenia Gravis
|
|
|
Damage of Lower Motor Neurons will create
|
Weakness or atrophy
|
|
|
interneurons are
|
Largest class of neurons that either process information close by or convey information short distances from on site of the neuron to another.
|
|
|
Cutaneous reflexes is when
|
Cutaneous stimulation results in reflexive movement
|
|
|
Myoclonus
|
Epilepsy, brain or spinal cord lesions
|
|
|
Hypotonia
|
Low resistance to passive stretch,
flaccidity, LMN lesions, Acute UMN |
|
|
Hypertonia
|
Abnormal strong resistanceto passive stretch
chronic UMN lesions, some basal ganglia disorders, spasticity and ridigity |
