. Anatomy, descriptive and applied. Anatomy. 162 SPECIAL ANATOMY OF THE SKELETON space is called an intercostal space (spatium intercostale). The length of these spaces corresponds to the length of the ribs and their cartilages; their breadth is greater in front than behind, and between the upper than between the lower ribs. The ribs increase in length from the first to the seventh, when they again diminish to the twelfth. In breadth they decrease from above downward; in the upper ten the greatest breadth is at the sternal extremity. Common Characters of the Ribs.—A rib from the middle of the
. Anatomy, descriptive and applied. Anatomy. 162 SPECIAL ANATOMY OF THE SKELETON space is called an intercostal space (spatium intercostale). The length of these spaces corresponds to the length of the ribs and their cartilages; their breadth is greater in front than behind, and between the upper than between the lower ribs. The ribs increase in length from the first to the seventh, when they again diminish to the twelfth. In breadth they decrease from above downward; in the upper ten the greatest breadth is at the sternal extremity. Common Characters of the Ribs.—A rib from the middle of the series should be taken in order to study the common characters of the ril)s (Figs. 129 and 130). Each rib presents two extremities, a posterior or vertebral, an anterior or sternal, and an intervening portion—the body or shaft. Posterior Extremity.—The posterior or vertebral extremity presents for examina- tion a head, neck, and tuberosity. The head (capituhim costae) (Fig. 130) is marked by a kidney-shaped artic- ular surface, divided by a horizontal ridge (crista capituli) into two facets for Demifacet for vertebra Interariicular crest ',C^^''%J>i|/ ^Demifacet for vertebra. Subcostal groove. Fig. 130.—A central rib of the left side, viewed from bebind. articulation with the costal cavity formed by the junction of the bodies of two contiguous thoracic vertebras; the upper facet is small, the inferior one of larger size; the ridge separating them serves for the attachment of the interarticular ligament. The neck (collum costae) is that flattened portion of the rib which extends out- ward from the head; it is about an inch long, and is placedLjnJi'ont of thejracs- verse process of the lower of the two vertebrae with which the head articulates. Its anterior surface is flat and smooth, its posterior surface is rough for the attach- ment of the middle costotransverse ligament,^^JKt is perforated by nimierous foramina, the direction of which is less constant than those fo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
