Unformatted text preview: ogical condition characterized by the loss of voluntary movements on one side of
the body. It typically results from damage to the corticospinal tract, either from lesions to
the motor cortex or from white matter lesions that destroy descending ﬁbers.! cerebellar atrophy!
Common term if disruption in the executive of these motor plans. Usually contralateral to the side of the brain where the lesion occurs (damage to right
hemisphere = movement problems in the left) and will depend on where in the motor cortex that occurs (for ex, if complete lesion on arm, then will lose
movement in the use of that arm). Then all the ascending pathways where damage can occur. Damage to the cerebellum can cause very speciﬁc motor
problems as well, may not cause somebody to be paralyzed, but they are not going to be able to modulate their movements very well. The cerebellum
codes for our body position in space, which is very important for maintaining posture, or reaching out to pick something up.. Patient with atrpphy in
cerebellum (unable to touch nose with ﬁnger smoothly) Disorders of Motor Pathways and Structures!
apraxia! apraxia = a motor disorder. And there can be different kinds depending on where it is located. It is the loss
of a skilled movement, that cannot be attributed to a weakness to move the muscles. A neurological syndrome characterized by loss of skilled or purposeful movement that cannot be
attributed to weakness or an inability to innervate the muscles. It often results from lesions of
premotor areas of the cerebral cortex.! ideomotor apraxia: the patient appears to have a rough sense of the desired action but has
problems executing it properly. 31:00 The mind knows what action it wants to achieve but has trouble carrying out that action.
Ex. Man trying to comb his hair ideantional apraxia: the patient’s knowledge about the intent of an action is disrupted. !
ideantional = the person has lost the goal representation of an action. If given set of tools,
wouldn't be able to point out what tool is needed to carrying out that action. **Split-brain patient = V.J. Woman asked to do tasks with right hand. For carrying out certain tasks with tools, seems to be represented in the right hand but
not the left. Doesn't have trouble with the movement, but in terms of representing that goal and converting that into an action plan is where she runs into
trouble. Disorders of Mo...
View Full Document
- Fall '11
- motor cortex, motor pathways