Axillary arch

The Axillary arch (/ækˈsɪləriː ɑːtʃ/) is a sporadic variant in the musculature associated with the latissimus dorsi muscle in humans. The axillary arch is formed when either a muscular or fascial slip develops extending between the latissimus dorsi and the pectoralis major. The axillary arch shows considerable variation in the exact position of its origin and insertions as well as its pattern of vascularisation and innervation. The axillary arch has several other names including Langer's axillary arch, the muscle of Langer, axillopectoral muscle, Achselbogen and pectorodorsalis muscle.