. Comparative anatomy. Anatomy, Comparative. A. VISCERAL SKELETAL ARCHES Cl -7) \ DEPRESSORES ARCUORUM Cl-7) LEVATORES f-4 DIGASTRICUS MASSETER TEMPORALIS DORSO-LARYNGIS AND DORSO-TRACHEALIS. B IMTERMANDIBULARES |/ RYO-LARYNGEI HYO-PHARYNGEI Fig. 223.— Diagrams illustrating the hypothetical evolution of the branchiomeric muscles. A. Hypothetical ancestral form. B. Branchiomeric muscles in urodele amphibian. (Redrawn after Wilder's "History of the Human Body," Henry Holt & Co.) Both groups are subdivided into levators and depressors. On the anterior side of the fin, a muscle is fo
. Comparative anatomy. Anatomy, Comparative. A. VISCERAL SKELETAL ARCHES Cl -7) \ DEPRESSORES ARCUORUM Cl-7) LEVATORES f-4 DIGASTRICUS MASSETER TEMPORALIS DORSO-LARYNGIS AND DORSO-TRACHEALIS. B IMTERMANDIBULARES |/ RYO-LARYNGEI HYO-PHARYNGEI Fig. 223.— Diagrams illustrating the hypothetical evolution of the branchiomeric muscles. A. Hypothetical ancestral form. B. Branchiomeric muscles in urodele amphibian. (Redrawn after Wilder's "History of the Human Body," Henry Holt & Co.) Both groups are subdivided into levators and depressors. On the anterior side of the fin, a muscle is formed which pulls the fin forward towards the head. No special antagonistic muscle is differentiated in elasmobranchs, the adduction of the fin being effected by the combined action of the posterior part of the levator and depressor groups acting together. The extension of the extrinsic muscles of the fins in fan-Hke form over the lateral trunk muscles tends to obscure the metamerism of these in the region of the appendages. The trapezius muscle which extends from. 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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