. Journal of anatomy. Ophidia. The last and in some ways the most specialised order of reptiles is theOphidia. According to Brandt (14) the grass snake, Tropidonotus natrix, ?pA-. Fi6. 5.—Diagram of the arterial arches in Vipcra herns. , carotis primaria; , ligamentum arteriosus (Botalli);T., thyroid artery ; V., vertebral artery. Other letters as before. possesses a solid strand of tissue joining the transverse part of the leftaortic arch to the carotis primaria, and so representing a ligamentumcaroticum. He states that it is a vestigial structure in some waysresembling the ductus Bot
. Journal of anatomy. Ophidia. The last and in some ways the most specialised order of reptiles is theOphidia. According to Brandt (14) the grass snake, Tropidonotus natrix, ?pA-. Fi6. 5.—Diagram of the arterial arches in Vipcra herns. , carotis primaria; , ligamentum arteriosus (Botalli);T., thyroid artery ; V., vertebral artery. Other letters as before. possesses a solid strand of tissue joining the transverse part of the leftaortic arch to the carotis primaria, and so representing a ligamentumcaroticum. He states that it is a vestigial structure in some waysresembling the ductus Botalli, and homologises it with the AbsteigenderSchenkel des Carotidenbogens of Rathke, proposing for it the name of ductus caroticus. I have had occasion to point out previously (83) thedoubtful nature of this vessel. No connexion exists in this position in the 146 Dr Chas. H. ODonoghue course of embryonic development. From its very nature as a remnant ofthe dorsal aorta of the embryo this vessel must be considerably dorsal tothe external carotid, and, indeed, in a line with the internal carotid,whereas the strand described by Brandt was not only ventral, butconsiderably
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
