Flashcards in 119-121 Deck (15)
What is an upper motor neuron lesion?
condition caused by vasc problems/stroke, trauma or tumors in the cns interrupting the descencing lower motor pathways exerting control on lmn's.
Where can lesions occur?
above level of the pyramids (as in the cerebrum as a result of stroke in the motor cortex or the posterior limb of the internal capsule) or in the SC
What would a unilateral lesion above the pyramids result in?
typical signs contralateral to the lesions
What would a unilateral lesion in the spinal cord result in?
disruption of motor control ipisilateral to the lesion
What happens during intial spinal shock
flaccid paralysis, hypotonia, hypoflexia
What happens after several weeks of spinal shock
weak voluntary movements. tone of muscle is increased beyond normal. and this results in the spasticity of the muslces (increased activity of gamma motor nuerons)
What is hyperflexia
deep tendon reflex is exaggarated
What are limb positions in cerebral lesions in the cerebral cortex, lateral capsule and thalamus
upper extremity: flexed
lower """" extended
some mscle paralysis in the contralateral head, and contralateral tonuge.
What are the limb positions in spinal cord lesions
What is the babinski sign
normal response in plantera flexion of digsit, abnormal: dorsiflexion
What is quadra/tetraplegia ___
paralysis of all four extremities.
" " of half the body
lower half of body paralysed
loss of function in on extemity.
Unilateral lesions above the pyramids result in
contralateral spastic paralysis
What happens when upper cerivals are completely transection
spastic paralysis (quadreplegia), loss of all ss below lesion
Whant happens when you transect thoracic duct
spastic paralysis, loss of SS below legion