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Human rib cage
The human rib cage is a part of the human skeleton within the thoracic area. A typical human ribcage consists of 24 ribs, 12 on each side of the thoracic cavity, the sternum and the 12 thoracic vertebrae in both males and females.
Additional recommended knowledge
Number of ribs
The number of ribs was noted by the Flemish anatomist Vesalius in 1543, setting off a wave of controversy, as it was traditionally assumed from the Biblical story of Adam and Eve that men's ribs would number one fewer than women's. (De humani corporis fabrica based on study, we have found that women have 13 pair of ribs and men have 12.) A small proportion of people have one pair more or fewer but this is unrelated to sex. Humans have seven true ribs, each with its own connection to the sternum. Humans also have five false ribs, the first three of which connect to the one above it. The last two, which don't connect to the sternum, are called floating ribs.
Ribs are attached behind the vertebral column.Your ribs help you to be able to breathe as when you inhale the ribs lift the rib cage allowing your lungs to expand and when you exhale they close squeezing the air out of your lungs.
The 12 pairs of ribs are attached behind to the thoracic vertebrae. The upper 7 are attached to the sternum by means of costal cartilage. Due to their elasticity they allow movement during inspiration and expiration. The 8th, 9th and 10th ribs join to the costal cartilages above and the 11th and 12th ribs are known as floating ribs. The rib cage encases and protects the lungs and the heart.
Types of ribs
The spaces between the ribs are known as intercostal spaces; they contain the intercostal muscles, nerves, and arteries. The rib cage allows for breathing due to its elasticity.
The atypical ribs are the 1st, 2nd, and 10th to 12th.
Categories: Human anatomy | Thorax | Flat bones
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Human_rib_cage". A list of authors is available in Wikipedia.|