. Cunningham's Text-book of anatomy. Anatomy. DEVELOPMENT OE THE AETEEIES. 1029 1st arch. Internal carotid"" Internal carotid Internal carotid Right common carotid «& Dorsal root of 3rd arch " Right sub- clavian artery Innominate artery — Right pulmonary artery ',', Ascending aorta -Sr 11 Pulmonary artery —fr — Dorsal root of right 6th arch Internal carotid External carotid External ,-•* carotid Dorsal root of left 3rd arch Left common carotid .Arch of aorta (4th arch) Left subcla- vian artery ---Arch of aorta \Ductus arteriosus svArch of aorta \Left pulmon- ary artery -Dors
. Cunningham's Text-book of anatomy. Anatomy. DEVELOPMENT OE THE AETEEIES. 1029 1st arch. Internal carotid"" Internal carotid Internal carotid Right common carotid «& Dorsal root of 3rd arch " Right sub- clavian artery Innominate artery — Right pulmonary artery ',', Ascending aorta -Sr 11 Pulmonary artery —fr — Dorsal root of right 6th arch Internal carotid External carotid External ,-•* carotid Dorsal root of left 3rd arch Left common carotid .Arch of aorta (4th arch) Left subcla- vian artery ---Arch of aorta \Ductus arteriosus svArch of aorta \Left pulmon- ary artery -Dorsal aorta are cephalic somites, then the point of commencement of the median aorta would be situated at the level of the seventh body somite, that is, at the situation of the future seventh cervical vertebra. The position of the anterior point of fusion of the primitive dorsal aortae is indicated m the adult by the origin of the abnormal right subclavian arterv, and is situated at the level of the fifth thoracic vertebra ; therefore the anterior end of that part of the descending External carotids aorta which is formed by the process of the primitive dorsal aortae must move caudalwards during the developmental period. The Branches of the Dorsal Aortae.—Each primitive dorsal aorta gives off a series of dorsal, lateral, and ventral branches. The dorsal branches are distributed to the neural tube and body wall; the lateral branches to the primi- tive excretory organs—the Wolffian bodies ; and the ventral branches pass to the alimentary canal, the yolk-sac, and to the placenta. The dorsal branches are intersegmental in arrangement, and when they first appear they pass dorsally, in the intervals between the mesodermal somites, supplying the walls of the neural tube and the adjacent mesoderm and nerve ganglia. After a time each primitive dorsal intersegmental artery gives off a ventral branch which passes first laterally and then ventrally in the body wall, towards"
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
