Motor Movement And Fiber Connections Flashcards
Fibers
The commissural fibers are coherent white-matter structures that connect the two hemispheres of the brain.
Association fibers connect regions within the same hemisphere of the brain
Projection fibers connect each region to other parts of the brain or to the spinal cord.
Commissural Fibers
•1. Corpus Callosum
Connects all hemispheres allowing them to communicate with one another
Primary Motor Cortex – Function
Execution of precise, discrete, skilled, complex motor actions via descending motor pathways
•Does not control individual muscles in isolation but rather groups of muscles
UMN symptoms of disease
Contralateral symptoms
Acute flaccidity (weakness)
babinski,
delayed spasticity,
hypo and hyper reflexia,
paralysis of speech muscles
LMN symptoms of disease
Ipsilateral symptoms
acute and permanent flaccidity,
hypo-reflexia (decreased reflexes) n involuntary extraneous movements,
Muscle atrophy (loss of strength)
31 Spinal Nerve Pair
cervical (8), thoracic (12), lumbar (5), sacral (5), and coccygeal (1)
Hemiparesis
one-sided muscle weakness
Flaccid
soft and limp; not firm; flabby
Hyperkinesia
excessive movement
Hypokinesia
diminished motor activity
Spastic
reference to motor neurons located in brainstem and spinal cord that directly project to muscles. (Stiffness)
(Change in muscle tone)
Atrophy
shrinkage or wasting away of an organ, tissue, or muscle
Upper Motor Neuron
reference to cortical motor neurons and their axons BEFORE they synapse on spinal motor neurons.
Originate in brain and brain stem, Carey information of desired movements in descending tracks of the corticobulbar and cortico spinal tracts
Lower Motor Neuron
reference to motor neurons located in brainstem and spinal cord that directly project to muscles.
Cortico-bulbar Tract
Carries signals to the brain stem to cause movement of the head, neck, and face
Corticospinal
Movement related signals to spinal cord to cause movement of the body
