Image from page 668 of "Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus" (1953)
Title: Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus
Identifier: comparativeembry00nels
Authors: Nelsen, Olin E. (Olin Everett), b. 1898
Subjects: Vertebrates -- Embryology; Comparative embryology
Publisher: New York, Blakiston
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library
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Text Appearing Before Image:
DEVELOPMENT OF LUNGS AND BUOYANCY STRUCTURES 643 STURGEON AND MANY TELEOSTS ERYTHRINUS CERATOOUS
Text Appearing After Image:
RETE MIRABILE â INTESTINAL ARTERY PORTAL VEIN HEPATIC VEIN Fig. 304. Swim-bladder and lung relationships. (A-F slightly modified from Dean: Fishes, Living and Fossil, 1895, New York and London, Macmillan and Co.; G after Goodrich, '30.) (A-E) Sagittal and transverse sections of swim-bladder relationships. (F) Lung relationship of Dipnoi and Tctrapoda. (G) Diagram of physoclistous swim bladder of teleost fish. most teleost and ganoid fishes. In elasmobranch and cyclostomatous fishes, the air bladder is absent. Two main types of air bladders are found: (1) a physoclistous type (fig. 304G), in which a direct connection with the pharyngeal area is lost (e.g., the toadfish, Opsanus tan), and (2) a more primitive physostomous variety (fig. 304A-E), retaining a pharyngeal or pneumatic duct (e.g., the common pike or pickerel, Esox Indus). One function of the air bladder presumably is to alter the density of the fish in such a way as to keep its density as a whole equal to the surrounding water at various levels (Goodrich, '30, p. 586). Buoyancy, therefore, is one of the main functions of the air bladder. The air bladders of fishes, in some cases at least, have both respiratory or lung and buoyancy functions (Goodrich, '30, pp. 578-593). In the bony ganoid fishes, Amia calva and Lepisosteus osseiis (fig. 304B), the air bladder apparently has a primary function of external respiration and, therefore, may
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