The brachial plexus is a bundle of nerves at the base of the neck, it is made up of the C4, C5, C6, C7, C8 and T1 spinal nerves. These nerves come from several regions of the spine, including four cervicals and one thoracic region. The nerves Source| Earth's Lab
INTRODUCTION The axillary artery has a distal part. The largest branch of this part is known as the subscapular artery (SA) which proceeds inferiorly on the wall of the posterior axillary. It follows the subscapularis muscle exactly on the lateral margin. Two terminal branches are the end Source| Earth's Lab
All muscles of Upper Limb and Their Nerve Supply| Anatomy QA