Final answer:
The inferior trunk of the brachial plexus is formed by the anterior divisions of the C8 and T1 spinal nerves, which are part of a complex network that innervates the upper limb.
Step-by-step explanation:
The two nerves that form the inferior trunk of the brachial plexus are the anterior divisions of the eighth cervical (C8) and the first thoracic (T1) spinal nerves. The brachial plexus is a nerve plexus associated with the lower cervical and upper thoracic spinal nerves, particularly C4 through T1, which reorganize to innervate the upper limb.
This plexus intricately combines the nerves to give rise to the systemic nerves of the arm, including the radial nerve and the axillary nerve. The brachial plexus is divided into roots, trunks, divisions, cords, and finally branches that become the systemic nerves including the radial, median, and ulnar nerves, which control sensory and motor functions in the arm.