++
Patients who present with weakness may be left with marked disability unless a diagnosis is made quickly. The motor divisions of the nervous system are responsible for every movement a person makes. Any injury to the motor parts will have a direct consequence on one’s ability to perform meaningful motions. Motor disorders can cause a variety of weakness patterns; therefore, it is important for the reader to recognize that the disorders mentioned in this chapter are not restricted to a specific pattern and have tremendous overlap. In this chapter, readers will review patterns of weakness in specific motor disorders of the nervous system.
++
The motor parts of the nervous system are responsible for every movement a person makes. Any injury to the motor division will have a direct consequence on one’s ability to perform meaningful motions. Therefore, it is vital to identify sources of motor injury in order to assist patients in regaining the ability to move. The purpose of this chapter is to identify patterns of weakness in specific motor disorders of the nervous system (Table 28-1). Motor disorders can cause a variety of weakness patterns; therefore, it is important for the reader to recognize that the disorders mentioned in this chapter are not restricted to a specific pattern and have tremendous overlap. Further descriptions of each disorder can be found in subsequent chapters in much more detail and are beyond the scope of this chapter.
++
+++
ELEMENTS OF THE MOTOR EXAMINATION
++
Several objective assessments can be performed to ascertain a pattern of weakness in order to better localize the neurologic dysfunction involved in a patient’s presentation of weakness. Common motor assessments include power, muscle bulk, tone, and muscle stretch reflexes (MSRs). Motor examination findings differentiating upper from lower motor neuron injury can be found in Table 28-2.