Rib 11
Costa XI
- Related terms: Rib [XI]
Definition
The rib 11 (eleventh rib) is one of the "floating ribs" in the human rib cage, meaning it does not attach to the sternum or to other ribs via costal cartilage.
Anatomically, the eleventh rib is shorter and less curved compared to the upper ribs. It has a single articular facet on its head for articulation with the T11 vertebra. The rib lacks a neck and tubercle, which are present in the upper ribs. The anterior end of the eleventh rib is pointed and does not connect to the sternum or other ribs, making it free-floating.
The eleventh intercostal nerve runs along the lower border of the eleventh rib, and it is important to note its course to avoid nerve damage during surgical procedures such as lumbotomy.[1-2] The nerve and associated vessels are located in the intercostal space between the internal oblique and transverse abdominal muscles, and they branch extensively in the abdominal wall.[1]
References
1.Surgical Anatomy of the 10th and 11th Intercostal, and Subcostal Nerves: Prevention of Damage During Lumbotomy.van der Graaf T, Verhagen PC, Kerver AL, Kleinrensink GJ.The Journal of Urology. 2011;186(2):579-83. doi:10.1016/j.juro.2011.03.120.
2.The Thoracoabdominal Intercostal Nerves: An Anatomical Study for Their Use in Neurotization.Court C, Vialle R, Lepeintre JF, Tadié M.Surgical and Radiologic Anatomy : SRA. 2005;27(1):8-14. doi:10.1007/s00276-004-0281-8.
