. The biology of the frog . t anteriorly or posteriorly according to the position of thelimb. When the thigh is pulled forward so that a line con-necting the centers of the origin and insertion of the musclelies in front of the head of t]?e femur, the contraction of theadductor magnus has the effect of moving the limb stillfarther forward while pulling it ventrally. When the thighis bent back so that the head of the femur lies in front of a. line connecting the centers of the origin and insertion, thecontraction of the muscle has the opposite effect. Theadductor magnus thus acts as an adductor
. The biology of the frog . t anteriorly or posteriorly according to the position of thelimb. When the thigh is pulled forward so that a line con-necting the centers of the origin and insertion of the musclelies in front of the head of t]?e femur, the contraction of theadductor magnus has the effect of moving the limb stillfarther forward while pulling it ventrally. When the thighis bent back so that the head of the femur lies in front of a. line connecting the centers of the origin and insertion, thecontraction of the muscle has the opposite effect. Theadductor magnus thus acts as an adductor or an abductoraccording to circumstances. The adductor, /ongus, a narrow muscle arising from*theventral part of the ileum just dorsal to the head of thesartorius ; distally it joins the adductor magnus. It is partlycovered by the sartorius, but a small portion of it is exposedalong the preaxial side of that muscle. It pulls the thighforward and ventrally. The trkeps femoris, a very large muscle covering the sbml Fig. 70.— Muscles of thefrog seen from the ventralside. On the left side (right of figure)some of the muscles have been partly re-moved, , adductor brevis ; ,adductor longus ; , adductor magnus ; del,deltoid; , extensor cruris; , extensor tarsi,or tibialis anticus brevis; FE, femur; , genio-hyoid; gstr, gastrocnemius; ,nvo-glossus; , inscriptionestendinae; , linea alba; , mylo-hyoid; ,transversus; , obliquus externus; , omosternum ; , posterior cornu ofhvoid; pet, pectoralis; petti, pectineus; per, peroneus; , rectos abdominis; , rectus internus major, or gracilis major; rectus internus minor, minor; sar, sartorius; , submentalis; , semitendinosus; ,tibialis anticus longus; , tibialis posticus; , tibio-fibula; , vastusinternus, caput anticum, or cruraiis; , xiphisternum. .(After Park
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