Final answer:
The medial antebrachial cutaneous nerve arises from the brachial plexus, typically derived from nerve roots C8 and T1.
Step-by-step explanation:
The medial antebrachial cutaneous nerve, which is not explicitly mentioned in the provided reference materials but is known for its supply to the skin of the forearm, arises from the brachial plexus associated with the lower cervical spinal nerves. The brachial plexus originates from the anterior rami of the spinal nerves C5 to T1. While specific branching patterns can vary, typically the medial antebrachial cutaneous nerve would be derived from nerve roots C8 and T1. This is important to consider when assessing nerve damage or planning surgeries that may involve the upper limb.