. Comparative anatomy. Anatomy, Comparative. Fig. 177.—Membrane bones of typical tetrapod; chondrocranium in dotted outline. interp, interparietal; pftix, premaxilla; pof, postfrental; porb, postorbital; prf, prefrontal; qj, quadratojugal; zyg, zygomatic. (From Kingsley's "Comparative Anatomy of ;). sDENTARY BONE C. D. Fig. 178.—The diagrams A-D illustrate the growth and enlargement of the mem- brane bones of the skull and their encroachment upon the chondrocranium. Cartilage and pro-cartilage bones are stippled, membrane bones black. Membrane bone is represented in the b
. Comparative anatomy. Anatomy, Comparative. Fig. 177.—Membrane bones of typical tetrapod; chondrocranium in dotted outline. interp, interparietal; pftix, premaxilla; pof, postfrental; porb, postorbital; prf, prefrontal; qj, quadratojugal; zyg, zygomatic. (From Kingsley's "Comparative Anatomy of ;). sDENTARY BONE C. D. Fig. 178.—The diagrams A-D illustrate the growth and enlargement of the mem- brane bones of the skull and their encroachment upon the chondrocranium. Cartilage and pro-cartilage bones are stippled, membrane bones black. Membrane bone is represented in the basal plates of the placoid scales of elasmobranchs (A). In the ganoid (B) the scales have fused and enlarged to form bony skutes, but the chondro- cranium remains cartilaginous. In amphibia (C) the cartilage is largely changed to bone and the two kinds of bone become fused together. In mammals (D) very little cartilage is left and the two kinds of bone unite to form bone complexes. Most of the covering bones of the mammalian cranium are membrane 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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