. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. VAGUS LATERAL LINE PLACODES EPI BRANCHIAL PLACODES OF N VAGUS ^OTIC VESICLE -!V LATERAL LINE PLACODE LONGITUDINAL ECTODERMAL THICKENING ECTODERMAL THICKENING HYOMANOIBULAR CLEFT EPIBRANCHIAL PLACODE GLOSSOPHARYNGEUS FACIALIS D. SUPRAORBITAL GROUP OF SENSE ORGANS MIOBODY LINE OF SENSE ORGANS Fig. 222. Neural crest cells in Ainbystoma piinctatum. (A and B from Johnston: Nervous System of Vertebrates, Philadelphia, Blakiston, '06; C-F from Stone: J.
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. VAGUS LATERAL LINE PLACODES EPI BRANCHIAL PLACODES OF N VAGUS ^OTIC VESICLE -!V LATERAL LINE PLACODE LONGITUDINAL ECTODERMAL THICKENING ECTODERMAL THICKENING HYOMANOIBULAR CLEFT EPIBRANCHIAL PLACODE GLOSSOPHARYNGEUS FACIALIS D. SUPRAORBITAL GROUP OF SENSE ORGANS MIOBODY LINE OF SENSE ORGANS Fig. 222. Neural crest cells in Ainbystoma piinctatum. (A and B from Johnston: Nervous System of Vertebrates, Philadelphia, Blakiston, '06; C-F from Stone: J. Exper. Zool., '35.) (A) Transverse section of early neural tube of Ambystoma, neural crest cells located dorsally and darkly shaded. (B) Later stage than (A), showing relation of neural crest cells, epidermis, and neural tube. (C-F) Neural crest cells stippled, placodes of special lateral line sense organs and cranial nerve ganglia shown in black. The neural crest cells arise from dorsal portion of neural tube at points of fusion of neural folds and migrate extensively. A considerable portion of neural crest cells descends upon the mesoderm of visceral arches as indicated in (D-F) and contributes mesodermal cells to these arches, where they later form cartilaginous tissue. of a delicate system of vessels which function for the transport of the circula- tory fluid or blood. The formation of these blood vessels begins below the forming entodermal tube as two, subenteric (subintestinal) tubes or capillaries. These capillaries grow forward below the anterior portion of the forming digestive tube. Near the anterior end of the latter, they separate and pass upward on either side around the gut tube to the dorsal area, where they come together again below the notochord and join to form the rudiments of the dorsal aortae. The latter are two delicate supraenteric capillaries which ex- tend from the forming head area caudally toward the trunk region. In the. Please note that these images
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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
