. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 48 C. H. ELLIS an homologous group of fibers elevating the chitinous plate in the tibio-metatarsal joint is still uncertain. The distribution of the arteries into the muscles and other tissues of the leg has never been adequately described. Causarcl (1896) figured the pedal arteries as simple uninterrupted tubes, one in each leg, emptying into the cavity of the leg through a single perforation in each segment except the tarsus where the artery ends as an open tube. Petrunkevitch (1910) stated that it is possible to trace the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 48 C. H. ELLIS an homologous group of fibers elevating the chitinous plate in the tibio-metatarsal joint is still uncertain. The distribution of the arteries into the muscles and other tissues of the leg has never been adequately described. Causarcl (1896) figured the pedal arteries as simple uninterrupted tubes, one in each leg, emptying into the cavity of the leg through a single perforation in each segment except the tarsus where the artery ends as an open tube. Petrunkevitch (1910) stated that it is possible to trace the pedal arteries as far as the claw, but said nothing concerning any branching within the leg. Profuse branching of the main pedal artery occurs, however, as can be seen by injecting an animal with a colored latex The branches arborize into the muscles in a manner quite similar to that described by Causarcl (1896) for the muscles of the cephalothorax (Fig. 3).. -DU FIGURE 3. Diagram showing the vascularization in the tibia of a spider. CP = chitinous plate, DM = dorsal interarticular membrane, DU = depressor unguium, FMB = flexor metatarsi bilobatus, FML = flexor metatarsi longus, PA = main pedal artery, RA = reflected arterial branch, VM — ventral interarticular membrane. With respect to a possible structural relation between the distribution of these vessels and the extensor function in the two joints under discussion, two peculiari- ties should be described. (1) Careful examination of the distribution of the main arterial trunk in the appendage shows that, although it runs somewhat dorsally through the major part of the femur and tibia, on approaching the respective joints, it dips ventrally and passes in close proximity over the chitinous plate. (2) In several preparations of the legs of tarantulas, a rather large branch has been found 4 In order to obtain any degree of success with injection of the arterial system in the legs of spiders it was found necessary t
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
