. Anatomy, descriptive and applied. Anatomy. THE RIBS 101 Non-articular pari of tubercle Angle I I 1^ Articular part of lulerclc. third, fourth, and fifth pieces are often formed from two centres placed laterally, the irregular union of which will serve to explain the occasional occurrence of the sternal fora- men (Fig. 126), or of the vertical sternal fissure, which occa- sionally intersects this part of the bone (Fig. 126), and which is further explained by the manner in which the cartilaginous matrix, in which ossification takes place, is formed. Union of the various centres of the gladiolu
. Anatomy, descriptive and applied. Anatomy. THE RIBS 101 Non-articular pari of tubercle Angle I I 1^ Articular part of lulerclc. third, fourth, and fifth pieces are often formed from two centres placed laterally, the irregular union of which will serve to explain the occasional occurrence of the sternal fora- men (Fig. 126), or of the vertical sternal fissure, which occa- sionally intersects this part of the bone (Fig. 126), and which is further explained by the manner in which the cartilaginous matrix, in which ossification takes place, is formed. Union of the various centres of the gladiolus com- mences about puberty, from below, and proceeds upward, so that by the age of twenty-five they are all united, and this portion of bone consists of one piece. The ensiform cartilage becomes joined to the gladiolus about forty. The manubrium is occasionally but seldom joined to the gladiolus in advanced life by bone. When this union takes place, however, it is generally only superficial, a portion of the centre of the sutural cartilage remaining unossified. Articulations.—With the clavicles and seven costal carti- lages on each side. Attachment of Muscles.—To nine pairs and one single muscle—the Pectoralis major, Sternomastoid, Sternohyoid, Sternothyroid, Triangularis sterni, aponeuroses of the ?Shaft Obliquus externus abdominis, Obliquus internus abdominis, Transversalis, Rectus abdominis muscles, and Diaphragm. The Ribs (Costae). Tlie ribs are elastic arches of bone, which form the chief part of the thoracic wails. They are twelve in number on each side; but this number may be increased by the development of a cervical or lumbar rib, or may be diminished to eleven. The first^.seven are connected behind with the spine and in front with the sternum, through the intervention of the costal cartilages; they are called true (vertebrosternal) ribs (costae verae)} The remaining five are false ribs {costae spuriae); of these, the first three have '<,\ their cartilages at
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
