. Chordate anatomy. Chordata; Anatomy, Comparative. B. PETROMYZON. HYPOBRANCHIAL MUSCLE LATERAL TRUNK MUSCLES ANUS XJRSAL CONSTRICTORS LEVATOR WAXILLAE f^ _^ SPIRACLE. I ^P^""^ pAXIAL TRUNK MUSCLES. HYPAXIAL MUSCLES CLOACAL-ANAL ORIFICE Fig. 183.—The lateral trunk muscles of a cephalochordate, a cyclostome, and an elasmobranch, showing their striking metamerism, and fundamental similarity. A, Amphioxus; B, Petromyzon; C, Squalus. dates, the Hemichorda and Urochorda, are non-metameric, we must assume that the metamerism of Amphioxus and vertebrates is a new acquisition in the group. T
. Chordate anatomy. Chordata; Anatomy, Comparative. B. PETROMYZON. HYPOBRANCHIAL MUSCLE LATERAL TRUNK MUSCLES ANUS XJRSAL CONSTRICTORS LEVATOR WAXILLAE f^ _^ SPIRACLE. I ^P^""^ pAXIAL TRUNK MUSCLES. HYPAXIAL MUSCLES CLOACAL-ANAL ORIFICE Fig. 183.—The lateral trunk muscles of a cephalochordate, a cyclostome, and an elasmobranch, showing their striking metamerism, and fundamental similarity. A, Amphioxus; B, Petromyzon; C, Squalus. dates, the Hemichorda and Urochorda, are non-metameric, we must assume that the metamerism of Amphioxus and vertebrates is a new acquisition in the group. The trunk muscles of Amphioxus form an unbroken series of segments extending throughout the entire length of the animal. Each muscle segment or myotome is a mass of muscle tissues which extends around the side of the body nearly to the mid-dorsal and mid-ventral line. Each myotome terminates anteriorly and poste- riorly in connective-tissue septa, the myocommata, which separate suc- cessive myotomes. A sharp bend near the middle of each myotome gives it in side view the shape of a letter V. All alike are innervated by somatic motor 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 & Co.
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
