. Le bulletin biologique. Biologie ; zoologie ; biologie ; biologie marine. ARLAX 264 L. EDGAR. La figure 1. Orgue à Lyriform marge distale du trochanter (flèche). L'autotomie plan qui sépare trochanter du fémur est indiqué sous l'autre extrémité de la flèche. Un cluster d'I- et de L-forme de fente organes peut-il vu sur la partie proximale du fémur peur). La figure 2. Plusieurs organes de la fente à la base du fémur en cluster (voir la Figure 1). La zone élargie au milieu de la fente reçoit probablement l'accessoire d'un neurone bipolaire. La figure 3. Grand, épais-bordé d'organes à fente sur le fémur (flèche) où l'art du fémur

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 264 ARLAX L. EDGAR. FIGURE 1. Lyriform organ at distal margin of trochanter (arrow). The autotomy plane which separates trochanter from femur is shown under the other end of the arrow. A cluster of I- and L-shaped slit organs may he seen on the proximal portion of the femur fright). FIGURE 2. Several slit organs clustered at base of femur (see Figure 1). The expanded area in the middle of the slit probably receives the attachment of a bipolar neuron. FIGURE 3. Large, thick-bordered slit organ on femur (arrow) where femur articulates with patella. FIGURE 4. Campaniform sensillium on twelfth article of the tarsus ; the structure measures approximately 20 by 15 microns. Figures 1-4 are photographs made from molt cases of Phalangiiun opilio L. tween legs were observed in the records obtained. Oscilloscope traces shown in Figures 5-7 were obtained from the left leg I of Plialanc/imu opilio. Legs from health}- adults were removed at the autotomy plane between the trochanter and femur and mounted upon a Plasticene support. Platinum wire electrodes inserted into the open, proximal end and the patellar end of the femur were connected via a Grass Type P. 4 preamplifier to a Tektronix 531 oscilloscope. By adequate support of all sections of the leg except the test area, stress could be placed on specific sensillae. Stress was produced by hyperextending or hyper- flexing the normal angle of movement at an articulation nearest the sense organ. This was done by manually-operated glass and steel probes. Although pressure was applied on all joints of the leg, action potentials were consistently obtained only upon hyperextension of the tibiometatarsal joint (Fig. 5) and hyperflexion of the tarsometatarsal joint (Fig. 6) and tarsal articles. Adapta- tion was rapid and complete. To localize the site of origin of the nervous activity shown in Figures 5 and 6, . Please note that these images are extracted from scanned

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• bookauthorlilliefrankrat
• booksubjectbiology
• booksubjectzoology