MUSCLES OF THE RIGHT INFERIOR LIMB 6 1 



A. MUSCLES OF THE THIGH 



(Nos. S3-42e; Fig. 21) 



33. Biceps femoris (biceps flexor cruris) muscle: The 

 long or posterior head, ischial tuberosity, caudal and three 

 sacral vertebrae; the short (caput brevis, smaller, or anterior) 

 head, first caudal and last three sacral spinous processes, 

 mainly; to crural fascia. Flexes and abducts cms. The origin 

 of each is somewhat involved with that of other muscles and 

 the two heads have a common insertion into the wide crural 

 fascia, extending over the crus and into the tendon of Achilles. 

 The biceps femoris is a large muscle, covers more than half the 

 lateral side of the thigh, and is antagonistic to the quadriceps 

 m. (42) and tensor fascia latae m. (34). 



Method: Remove the mass of fat, including the large lymph 

 gland, from the pophteal space, insert the fingers and use the 

 handle of the scalpel or grooved director to force the biceps 

 femoris m. {3;^^) laterad and the semitendinosus (41) and semi- 

 membranosus (39) mm. mediad until the sciatic nerve and 

 tenuismus muscle (34) are located. The tenuissimus m. 

 (34) will probably be found lying along the caudomedial border 

 of the biceps femoris. Insert the grooved director craniad 

 under the biceps and transect it, then the tenuismus (34), but 

 at different levels to show the instructor that it was not inad- 

 vertently cut both at one time. Leave the distal end of the 

 tenuissimus attached with the common insertion of the biceps 

 femoris. 



34. Tenuissimus (tensor fasciae cruris, abductor cruris) m. : 

 Transverse process of first caudal vertebra, by a long thread- 

 like tendon, at the caudal border of the gluteus maximus m. 

 (36) and under the long head of the biceps m. {33) ; to crural 

 fascia, with tendons of biceps femoris. 



35. Tensor fasciae latae (tensor femoris vaginae) m.: 

 Ventral border of ilium fused with the gluteus medius, and wide 

 lumbar fascia; to fascia lata and cranial side of femur. Pri- 



