Final answer:
The brachial plexus can be injured by extreme movements or positions of the head and arm, leading to motor and sensory issues in the arm, shoulder, and hand. The correct option is D.
Step-by-step explanation:
Extreme positions of the head and arm can cause injury to the brachial plexus. The brachial plexus is a nerve plexus associated with the lower cervical spinal nerves and the first thoracic spinal nerve, encompassing spinal nerves C4 through T1.
It is responsible for giving rise to nerves of the arms, including the radial, ulnar, and median nerves. Injuries to the brachial plexus can result in various motor and sensory deficits in the arm, shoulder, and hand.
The brachial plexus is positioned in such a way that it can be affected by extreme movements or positions of the arm and head, leading to potential injuries.