Final answer:
The axillary nerve arises from two cords of the brachial plexus, providing motor and sensory functions to parts of the upper limb.
Step-by-step explanation:
The nerve that arises from two cords of the brachial plexus is the axillary nerve. The brachial plexus is a network of nerves that originates from the spinal nerves C4 through T1, and branches out to nerve the upper limb. The axillary nerve is a prominent nerve from the posterior cord of the brachial plexus that innervates the deltoid and teres minor muscles as well as provides sensory innervation to the skin overlying the deltoid muscle. It is essential for the abduction of the arm at the shoulder joint.
Understanding the brachial plexus is crucial for diagnosing and treating injuries related to arm movement and sensation, usually covered in programs concerning health sciences and medicine. The brachial plexus can be remembered as a network that allows for motor and sensory functions in the arms, with the axillary nerve playing a vital role in these processes.