Archive image from page 241 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 Fourth rib. Extremities. — (a) Posterior or vertebral extremity, (fig. 663. r).— This is rougher and somewhat thicker than the other parts of the rib, and is hence denominated its head (capitulum cosies). It presents, except in in- stances to be presently stated two articular facets, a superior and an inferior one, sepa- rated by a well-defined ridge. Each of these facets articulates with a corresponding small surface on the bodies of two vertebra?, the rid
Archive image from page 241 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 Fourth rib. Extremities. — (a) Posterior or vertebral extremity, (fig. 663. r).— This is rougher and somewhat thicker than the other parts of the rib, and is hence denominated its head (capitulum cosies). It presents, except in in- stances to be presently stated two articular facets, a superior and an inferior one, sepa- rated by a well-defined ridge. Each of these facets articulates with a corresponding small surface on the bodies of two vertebra?, the ridge just mentioned corresponding with the intervertebral substance. The head of the rib is supported by a narrow round part, somewhat constricted — the iwck (fig. 663. /). This is flattened from before backwards and is the weakest part of the bone. Behind the neck there are some inequalities, which correspond to the trans- verse process of the dorsal vertebra below. Externally to the neck is an eminence known as the tubercle of the rib (tuberos- ity, tuberculum costce, jig. 663. g), which is smooth in one part for its articulation with the transverse process of the lower of the two vertebras to which the head is connected, and rough in the other, which is posterior, and in some ribs superior to the above, for the inser- tion of the posterior costo-transverse liga- ment. The tubercles are most prominent in the four or five superior ribs. Anterior to the tubercle the rib suddenly bends forwards, leaving this part the most convex, making what is termed its angle, (fig. 663. //) The interval which separates the tuberosity from the angle, is the thickest, roundest, and strongest part of the bone. (b) Anterior, or sternal extremity (fig. 663. cT). — The anterior extremity of the ribs is broad, flat, and deeply hollowed out at its tip into an oval pit, into which is implanted the costal cartilage. This extremity of the rib is broader and thicker than it is an inch more poster
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