OCR Text |
Show 1895.] MUSCULAR ANATOMY OF XENOPUS. 847 narrow stout tendon from the symphysis pubis, and at its insertion is wrapped round the insertion of the adductor magnus. The latter (the Adductor magnus) arises behind the Adductor longus. The Adductor brevis and pectineus form an inseparable fleshy mass. The Sartorius (see fig. 4) is a very much larger muscle than it is in the C o m m o n Frog; it is over half an inch in diameter at its widest part. It arises not only from the symphysis of the innominate bones, Fig. 4. A. B. A. Under surface of scapula of Pipa: 1, 2, 3, transversi scapulares; 4, 5, 6, protrahens scapulae, levator anguli scapulaa, and sternocleido-mastoid, attaching scapula to head; 7, cucullaris; 8, interscapularis. B. Under surface of scapula of Xenopus: 1-3, transversi scapulares ; 4, rhomboideus ; 7, cucullaris; 5 and 6 appear to correspond to those muscles so lettered in Pipa or perhaps to 4 and 5. but from the cartilaginous pre-pubis, and from the septum between itself and the abdominal muscles; it thus appears to arise from the anterior margin of the thigh for about one-third of its extent. The posterior boundary is overlapped and covered for some depth by the semitendinosus and recti interni. The muscle may be said to have two insertions : one is muscular upon the knee-joint in contact with, but anterior to, the rectus internus; the other is upon the tendon and tendinous sheath which covers the end of the semitendinosus. The Semitendinosus comes next to the sartorius ; as already stated, it overlaps it and is itself overlapped, but not wholly concealed, by the rectus internus. It is a long thin flat muscle with a single muscular origin ; there is no trace of a double origin as in the Frog, nor is there any connection with the Adductor 54* |