. Carnegie Institution of Washington publication. . Fio. 26, a and 6. Successive stages in the formation of the basilar artery, partly by connecting up of irregularly alternating segments of the right and left longitudinal neural arteries and partly by a coalescence of the two. a, embryo No. 2841, 4 mm. in length; 6, embryo No. 810, 5 mm. in length. In a 4-mm. embryo (No. 2841) the formation of the basilar is well under way and the sixth arch is present. In figure 26 a, drawn from a model, two strong anastomoses can be seen about opposite the otic vesicle and some slender ones lying more cauda
. Carnegie Institution of Washington publication. . Fio. 26, a and 6. Successive stages in the formation of the basilar artery, partly by connecting up of irregularly alternating segments of the right and left longitudinal neural arteries and partly by a coalescence of the two. a, embryo No. 2841, 4 mm. in length; 6, embryo No. 810, 5 mm. in length. In a 4-mm. embryo (No. 2841) the formation of the basilar is well under way and the sixth arch is present. In figure 26 a, drawn from a model, two strong anastomoses can be seen about opposite the otic vesicle and some slender ones lying more caudally. Behind the strong anastomoses the right longitudinal artery has enlarged but the left is still uninterrupted. Cranially the left is not only the weaker but has lost its continuity. This enlargement of irregularly alternating segments of the two longitudinal arteries is what De Vriese and Sterzi found in other forms. In the model of a somewhat later stage we find the basilar artery as a single vessel through most of its extent, though one large and several smaller islands are present (fig. 26 b). Between them it lies too far midway of the position of the. 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 perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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