A patient has an injury of the spine and is now suffering from a loss of motor function in his right arm.However,he still has normal sensory function in the arm.Based on this information it is likely that the patient has nervous tissue damage located at ________.
A) the dorsal root located at one or more of the cervical vertebra
B) the ventral root located at one or more of the cervical vertebra
C) the dorsal rootlets located at one of the thoracic vertebra
D) spinal nerves of the cervical vertebra

Question

Quizplus · Accepted Answer

Loss of motor function but preservation of sensory function indicates damage to the ventral root, which contains motor neurons that control movement in the arm, but does not affect sensory input. The injury is likely located at one or more of the cervical vertebrae, as this is where the nerves that control the arm originate. The other choices are incorrect because they do not match the symptoms described.

A Patient Has an Injury of the Spine and Is