The musculocutaneous nerve has a segmental origin - C5-C6. As its name suggests, it has both motor and sensory fibres. The brachial plexus originates from anterior rami of C5, C6, C7, C8 and T1 and it forms the musculocutaneous, median, ulnar, axillary and radial nerves. The lateral cord divides into the musculocutaneous nerve and the lateral branch of the median nerve.1
This is a companion discussion topic for the original article at https://patient.info/doctor/neurology/musculocutaneous-nerve-lesion-c5-c6