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Classification and Evolution of the Chordates
Development of the Individual
ORGAN SYSTEMS OF VERTEBRATES
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amphibians amphioxus animals aorta archinephric duct artery atrium birds blood vessels body bony brain branch branchial canal cartilage cartilaginous caudal cavity cells cloaca coelom composed connective tissue cranial nerves cyclostomes derived dermal diencephalon dorsal ectoderm elasmobranchs embryo epithelium external fibers fishes foramen function fused ganglion gill slits girdle glands heart higher forms hormone hyoid intestine kidney lamprey lateral layer lies lizards lobe located lungs male mammals maxillary median medulla medulla oblongata membrane bones mesencephalon mouth muscles myotomes nasal Necturus nervous system neural notochord olfactory opening optic organs origin ovaries oviduct pair papillae passes pectoral pelvic pharynx portion posterior end posteriorly pouches present primitive region reptiles ribs salientians secretion sensory sinus skin skull somatic species spinal cord spinal nerves sternum structure surface swim bladder teeth teleosts tetrapods thoracic thyroid tion tube tubules usually veins ventral side ventricle vertebral column vertebrates visceral arches wall