. The anatomy of the domestic animals. Veterinary anatomy. THE COSTAL CARTILAGES 47 Tubercle extensive articular surface which is convex in its length. The sternal end is larger than that of any other ril); it is thick and very wide, and is turned a little forward. The last rib is the most slender and regularlj' curved. It is usually but little longer tlian the second. The facet on the tubercle is confluent with that of the head. (This feature, however, is common on the seventeenth also, and may occur on the sixteenth.) The serial position of the other ribs may be determined approximately by t
. The anatomy of the domestic animals. Veterinary anatomy. THE COSTAL CARTILAGES 47 Tubercle extensive articular surface which is convex in its length. The sternal end is larger than that of any other ril); it is thick and very wide, and is turned a little forward. The last rib is the most slender and regularlj' curved. It is usually but little longer tlian the second. The facet on the tubercle is confluent with that of the head. (This feature, however, is common on the seventeenth also, and may occur on the sixteenth.) The serial position of the other ribs may be determined approximately by the fol- lowing : The length increases from the first to the tenth and eleventh and then diminishes. The width increases somewhat to the and then diminishes. The anterior border is thin and sharp from the second to the eighth, and behinil this becomes thick and rounded. The groove of the lateral surface is distinct on the fourth to the eighth inclusive. The curvature increases in degree rapidly from the second to the seventh, remains aliout the same to the six- teenth, and then decreases very noticeably. In re- gard to ilorso-ventral direction, the first ril) inclines a little forward, the second is about vertical, while behiufl this they slope backward in increasing de- gree, so that a transverse plane tangent to the ventral ends of the last pair cuts the third lumbar vertebra. The head antl tubercle diminish in size from first to last. Their relative positions change, in that the tubercle of the first rib is almost directly lateral to the head, while further back it gratlually comes to lie behind it. The neck is longest on the longest ribs, and is al«ont on the last two or three. A costo-transverse foramen (Foramen costo-transver- sarium) is formed between the neck antl the trans- verse process. Development.—The ribs ossify in cartilage from three centers, one each for the shaft, head, and tubercle; the third center is absent in some of the posterior
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectveterinaryanatomy
