What spinal nerves contribute to the innervation of the axillary nerve?

The axillary nerve is primarily innervated by contributions from the C5 and C6 spinal nerves. This nerve emerges from the brachial plexus and plays a crucial role in the movement and sensation of the shoulder. Specifically, it supplies the deltoid and teres minor muscles, which are essential for shoulder abduction and stabilization.

The reason these spinal nerves are pivotal is that the upper trunk of the brachial plexus, which gives rise to the axillary nerve, arises from these specific cervical spinal roots. Therefore, understanding the innervation of this nerve is essential for recognizing its functional significance in shoulder mechanics and identifying potential injuries or pathologies associated with it.

The other options listed involve different combinations of spinal nerves, none of which accurately reflect the specific contributions to the axillary nerve.