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Show 700 MR. F. G. PARSONS ON T H E [June 16 The Flexor caudce Internus is inserted by long tendons into the ventral surface of the roots of the transverse processes, the most internal tendons being first inserted, while the deeper ones reach the surface round the outer side of them. The flexor caudce profundus is fleshy, and runs along the ventral surface of the tail close to the middle line, being concealed by the last muscle and separated by a nerve from the flexor caudae externus. Muscles of the Posterior Extremitg. The Gluteus maximus or Ectogluteus is a small thin sheet of muscle rising from the sacral spines and fusing anteriorly with the sacro-lumbalis. It is inserted just below the great trochanter. The Gluteus medlus is much larger than the last, and rises from the greater part of the gluteal surface of the ilium by two perfectly distinct layers, of which the superficial is inserted by flesh and the deep by tendon into the outer side of the great trochanter. The Gluteus minimus is small, and is covered by the medius; it is inserted by tendon into the front of the great trochanter. The Gluteus quarlus or Scansorius is very distinct and comes from the ventral border of the ilium; it is inserted into the anterior surface of the femur just below the great trochanter. The Tensor fasciae femoris and Sartorius are inseparable, the latter part, being feebly marked; they rise from the anterior ventral spine of the ilium and are inserted into the fascia of the thigh nearly as far as the patella. This sheet of muscle is supplied entirely by the anterior crural nerve. The Pyriformis is well marked and normal. The Obturator internus is normal; on its deep surface the tendon is divided into three bands. The Gemelll are represented by one continuous muscle, which rises from the ventral margin of the lesser sciatic notch; it is best seen when the obturator internus is cut and reflected. Meckel' states that these muscles are absent in tbe Kangaroo. The"Quadratus femoris is a large triangular muscle, which is inserted by tendon into the second quarter of the femur. The Obturator externus is large and normal. The Biceps consists of two parts, though I am doubtful whether the part described first should not rather be included with the gluteus maximus. The anterior portion rises from the posterior sacral and anterior caudal spines and transverse processes; it is inserted by a narrow tendon into the outer side of the patella. The posterior part is large and rises from the ischial tuberosity as well as by a small origin from the caudal vertebrae; it is inserted into the fascia of the upper half of the leg. The Semltendinostts rises from the tuber ischii with the biceps, and is inserted into the cnemial crest of the tibia. The Semimembranosus is a small muscle ; it rises from the tuber 1 ' Anatomic comparee,' vol. vi. p. 364. |
