. Human embryology and morphology. Embryology, Human; Morphology. 300 HUMAN EMBRYOLOGY AND MORPHOLOGY. (2) the vertebral border (crest) has become enormously elongated and gives attachment to abdominal muscles, cutting off the fibres of insertion of the external oblique which form the chief part of Poupart's ligament; (3) the ischium does not reach the ventral line. In most birds, neither ischium nor pubes reach the ventral line. The pubes fail to meet in cases of ectopia vesicae. The symphysis pubis is formed in the ventral line. The cotyloid bone—os acetabuli—is formed in the Y-shaped cartil
. Human embryology and morphology. Embryology, Human; Morphology. 300 HUMAN EMBRYOLOGY AND MORPHOLOGY. (2) the vertebral border (crest) has become enormously elongated and gives attachment to abdominal muscles, cutting off the fibres of insertion of the external oblique which form the chief part of Poupart's ligament; (3) the ischium does not reach the ventral line. In most birds, neither ischium nor pubes reach the ventral line. The pubes fail to meet in cases of ectopia vesicae. The symphysis pubis is formed in the ventral line. The cotyloid bone—os acetabuli—is formed in the Y-shaped cartilage between the three elements. It ossifies in the 13th year. Professor Howes has pointed out that it is this ossification which forms the pubic part of the acetabulum, and that it is really part of the pubes. Shoulder Girdle.—The duckbill (ornithorynchus) shows the most generalized type of mammalian shoulder girdle ; it resembles closely the primitive reptilian type; from such a form the various types of mammalian shoulder girdle were probably evolved. The dorsal part of the arch consists of (1) scapula, (2) supra- scapula (Fig. 244). The supra-scapula is represented in man by the cartilage along the vertebral border; it ossifies in the early clavicle (dermal) spine / jnfer clavicle (dermal). Fio. 244.—The Shoulder Girdle of Ornithorynchus. years of manhood. The supra-spinous part of the scapula appears first in higher mammals; it is produced late in the development of the scapula (in the 3rd month of foetal life) by the upgrowth of the supra-spinous blade of the scapula ; it is not represented in the pelvic girdle. The spine of the scapula is represented in the pelvic girdle by the ilio-pectineal line of the ilium; but there is no pelvic representative of the acromion process. The dorsal. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
