U. The spleen.
V V. The pancreas.
W. The sigmoid flexure of the colon.
X. The caput coli.
Y. The mesentery supporting the numerous looping branches of the superior mesenteric artery.
Z. Some coils of the small intestine.
2. Innominate artery.
3. Right subclavian artery.
4. Right common carotid artery.
5. Left subclavian artery.