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The costal cartilages are bars of hyaline cartilage which serve to prolong the ribs forward and contribute very materially to the elasticity of the walls of the thorax. Image File history File links Download high resolution version (526x650, 34 KB)From Grays Anatomy Anterior surface of sternum and costa cartilages. ...
Figure 1 : Anterior surface of sternum and costa cartilages. ...
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Embryology is the branch of developmental biology that studies embryos and their development. ...
Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ...
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Cartilage is a type of dense connective tissue. ...
Cartilage is a type of dense connective tissue. ...
Diagram of a tsetse fly, showing the head, thorax and abdomen The thorax is a division of an animals body that lies between the head and the abdomen. ...
Differences from 1-12 The first seven pairs are connected with the sternum; the next three are each articulated with the lower border of the cartilage of the preceding rib; the last two have pointed extremities, which end in the wall of the abdomen. Figure 1 : Anterior surface of sternum and costa cartilages. ...
The abdomen is a part of the body. ...
Like the ribs, the costal cartilages vary in their length, breadth, and direction.
They increase in length from the first to the seventh, then gradually decrease to the twelfth.
Their breadth, as well as that of the intervals between them, diminishes from the first to the last. They are broad at their attachments to the ribs, and taper toward their sternal extremities, excepting the first two, which are of the same breadth throughout, and the sixth, seventh, and eighth, which are enlarged where their margins are in contact.
They also vary in direction: the first descends a little, the second is horizontal, the third ascends slightly, while the others are angular, following the course of the ribs for a short distance, and then ascending to the sternum or preceding cartilage.
Structure Each costal cartilage presents two surfaces, two borders, and two extremities.
Surfaces The anterior surface is convex, and looks forward and upward: that of the first gives attachment to the costoclavicular ligament and the Subclavius muscle; those of the first six or seven at their sternal ends, to the Pectoralis major. The others are covered by, and give partial attachment to, some of the flat muscles of the abdomen. The Subclavius muscle is a muscle of the human body. ...
Location The clavicular head of the pectoralis major takes its origin from the anterior surface of the medial half of the clavicle. ...
The posterior surface is concave, and directed backward and downward; that of the first gives attachment to the Sternothyroideus, those of the third to the sixth inclusive to the Transversus thoracis, and the six or seven inferior ones to the Transversus abdominis and the diaphragm. The tranversus thoracis lies internal to the thoracic cage, anteriorly. ...
The transversus abdominis muscle, also known as the transverse abdominal muscle, is a muscle layer of the anterior and lateral abdominal wall which is near to the internal oblique muscle. ...
In the anatomy of mammals, the diaphragm is a shelf of muscle extending across the bottom of the ribcage. ...
Borders Of the two borders the superior is concave, the inferior convex; they afford attachment to the Intercostales interni: the upper border of the sixth gives attachment also to the Pectoralis major. Location The clavicular head of the pectoralis major takes its origin from the anterior surface of the medial half of the clavicle. ...
The inferior borders of the sixth, seventh, eighth, and ninth cartilages present heel-like projections at the points of greatest convexity.
These projections carry smooth oblong facets which articulate respectively with facets on slight projections from the upper borders of the seventh, eighth, ninth, and tenth cartilages.
Extremities The lateral end of each cartilage is continuous with the osseous tissue of the rib to which it belongs.
The medial end of the first is continuous with the sternum; the medial ends of the six succeeding ones are rounded and are received into shallow concavities on the lateral margins of the sternum.
The medial ends of the eighth, ninth, and tenth costal cartilages are pointed, and are connected each with the cartilage immediately above.
Those of the eleventh and twelfth are pointed and free.
In old age the costal cartilages are prone to undergo superficial ossification.
External links This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant. The public domain comprises the body of all creative works and other knowledge—writing, artwork, music, science, inventions, and others—in which no person or organization has any proprietary interest. ...
An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...
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