Final answer:
If a person has a motor disorder and cannot move their arm voluntarily, but their muscles have tone, it is likely that the lower motor neurons are affected. Potential causes or medical conditions associated with the inability to move both the upper and lower extremities in an individual can include spinal cord injuries, musculoskeletal diseases like arthritis or joint damage, fractures of the upper limb bones, and systemic illnesses like gout.
Step-by-step explanation:
If a person has a motor disorder and cannot move their arm voluntarily, but their muscles have tone, it is likely that the lower motor neurons are affected. Lower motor neurons are responsible for sending signals from the central nervous system to the muscles, allowing voluntary movement. In this case, the problem is likely occurring in the lower motor neurons that innervate the muscles of the arm, causing the loss of voluntary movement.
Potential causes or medical conditions associated with the inability to move both the upper and lower extremities in an individual can include spinal cord injuries, such as those resulting from car crashes or diving accidents. These injuries can disrupt the communication between the brain and the body, leading to paralysis or loss of movement in the affected limbs. Musculoskeletal diseases, such as arthritis or joint damage, can also impair mobility and make it difficult to move the extremities. Additionally, injuries like fractures of the upper limb bones or systemic illnesses like gout can hamper the ability to move.
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