S. Transversalis humeri artery.
T. Transversalis colli artery.
U. Union of the post scapular and external jugular veins, which enter the subclavian vein by a common trunk.
V. Post-half of the omo-hyoid muscle.
W. Part of the subclavian vein seen above the clavicle.
X. Scalenus muscle separating the subclavian artery from vein.
Y. Clavicle.
Z. Trapezius muscle.
1. Sternal origin of sterno-mastoid muscle of left side.
2. Clavicular origin of sterno-mastoid muscle of right side turned down.