The elasmobranch fishes (1934) The elasmobranch fishes elasmobranchfish03dani Year: 1934 94 THE ELASMOBRANCH FISHES inserted at the symphysis of the mandible. The paired coracohyoideus muscles {) continue forward from the coraeoarcuales as a layer just dorsal to the sides of the coracomandibularis. They are relatively broad muscles in Hep- tanchus and are inserted on the basi- and ceratohyoid cartilages {ch., fig. 50a) , only a few of the fibers reaching the base of the ceratohyoid cartilage. Dorsal to the region of the coraco- hyoideus muscle is the third group, the coracobranchi- ales
The elasmobranch fishes (1934) The elasmobranch fishes elasmobranchfish03dani Year: 1934 94 THE ELASMOBRANCH FISHES inserted at the symphysis of the mandible. The paired coracohyoideus muscles {) continue forward from the coraeoarcuales as a layer just dorsal to the sides of the coracomandibularis. They are relatively broad muscles in Hep- tanchus and are inserted on the basi- and ceratohyoid cartilages {ch., fig. 50a) , only a few of the fibers reaching the base of the ceratohyoid cartilage. Dorsal to the region of the coraco- hyoideus muscle is the third group, the coracobranchi- ales muscles (^''). The first six of these arise from the heavy connective tissue dorsal to the coraeoarcuales and pass forward, upward, and outward as narrow slips to be inserted on the hypo- branchial cartilages. The last or seventh (~) arises in two parts; one part is continuous with the sixth, and the other originates di- rectly from the coracoid cartilage. This muscle in- serts as a wide band along the whole length of the last ceratobranchial cartilage and a part of the median piece. Slips of the ventral constrictor (interbranchial, ihv.^'''\ fig. 95) muscles pass through the ceratobranchial muscles. Muscles op the Fins Fig. 95. Ventral longitudinal or hypobranehial muscles, Heptanchus maculatus. (From Davidson.) hh., basihyal cartilage; car., coracoarcualis muscle; c&.\ first ceratobranchial cartilage; }'', first to seventh coracobranchial muscles; ch., ceratohyal carti- lage; , coracohyoideus; , coracomandibularis muscle; co., coracoid cartilage; rbv.^'', first to sixth in- terbranchial slips; md., mandibular cartilage. The muscles on the dorsal side of the pectoral fin (, fig. 90) take origin from the posterolateral margin of the scapula, and from the basal and, in part, from the radial car- tilages of the fin skeleton. The radial muscles are distinct in the central part of the fin, but on the posterior margin the separation into definite bun
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