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Classification and Evolution of the Chordates
Early Development and Histogenesis
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amphibians amphioxus animals anurans aorta aortic arches appear arteries become birds blood vessels body bony brain branch branchial capillaries cartilage cartilaginous caudal cavity cells cloaca coelom composed connective tissue cranial nerves cyclostomes derived dermal dermis dorsal duct ectoderm eggs elasmobranchs embryo endocrine epidermis epithelium external fibers fins fishes follicles foramen function fused ganglion girdle hair heart higher forms hormone hyoid intestine kidney lacking lamprey layer limbs lizards lobe located lower lungs male mammals medulla membrane bones mesoderm mesonephros mouth muscles myotomes nasal nervous neural notochord olfactory organs origin ovaries pair papillae pectoral pelvic pharynx pigment pituitary gland portion posterior pouches present primitive region reptiles ribs scales secretion sensory side skin skull snakes somatic species spinal cord spinal nerves structure surface swim bladder teeth teleosts tetrapods thyroid tion tube tubules urodeles usually veins ventral ventricle vertebral column vertebrates visceral visceral arches wall