. Cunningham's Text-book of anatomy. Anatomy. Primitive ventral aorta Truncus arteriosus \ â Bulbus cordis - - Atrio-ventricular canal _/ Truncus arteriosus becomes converted into the lateral umbilical ligament, but a portion of tbe part which lies in the pelvis minor remains pervious and from it springs the superior vesical artery. The Arteries of the Limbs.âOur knowledge of the development of the arteries of the limbs is still very deficient, but during the last few years some investigations have been made and certain facts have been established. The very earliest stages of development have
. Cunningham's Text-book of anatomy. Anatomy. Primitive ventral aorta Truncus arteriosus \ â Bulbus cordis - - Atrio-ventricular canal _/ Truncus arteriosus becomes converted into the lateral umbilical ligament, but a portion of tbe part which lies in the pelvis minor remains pervious and from it springs the superior vesical artery. The Arteries of the Limbs.âOur knowledge of the development of the arteries of the limbs is still very deficient, but during the last few years some investigations have been made and certain facts have been established. The very earliest stages of development have not yet been seen in the human subject, but it is not probable that they differ, in any essential respects, from those found in other mammals; therefore it may be assumed that the upper limb is supplied, at first, by a number of branches which spring from the sides of the primitive dorsal aortae. As development proceeds the number of the vessels is re- duced until only one remains. This loses its direct connexion with the aorta and becomes attached to the seventh seg- mental artery forming the ventral branch of that vessel, and the lateral division of the branch ; the ventral continua- tion, past the lateral branch, being, apparently, a later for- mation. In the earlier stages the portion of the artery which lies in the free part of the limb does not consist of a single stem but of a plexiform series of vessels which only gradually become reduced to a stem. When the stem is definitely established it is divisible into subclavian, axillary, brachial, and volar interosseous portions. The median, the radial, and the ulnar arteries are of later formation. In the case of the lower limb the earliest known artery is the primitive inferior gluteal, which springs from the secondary root of origin of the umbilical artery. It is con- verted into the inferior glutaeal and popliteal arteries of the adult. The external iliac and femoral arteries are parts of a later formation which arises f
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
