LABORATORY MANUAL OF PHYSIOLOGY. 



a glass hook. Cut the thigh muscles near their insertions about 

 the knee, being careful not to cut the nerve. Cut the muscles, also, 

 near the pelvic articulation of the femur. Remove all the abdom- 

 inal viscera, thus exposing the nerve in the lumbo-sacral plexus. 

 Cut through the vertebral column just above the last two verte- 

 brae which join the urostyle. Remove 

 the muscles on each side of the urostyle. 

 Cut through the junction of the last ver- 

 tebra with the urostyle, and, using the 

 two vertebrae as a handle, lift the nerve 

 from its bed from above downward, 

 cutting its branches and carefully free- 

 ing it from the groove over the femoro- 

 pelvic articulation. Cut through the 

 femur just below its articulation with 

 the pelvis and the preparation is com- 



FIG. 9.- Gastrocnemius- sciatic lt ^ p j x The femur 

 Preparation. 



be clamped in the muscle clamp and the 



thread about the tendo Achillis, to the myograph lever. Both nerve 

 and muscle should be kept moist with physiological salt solution. 



2. Double Semimembranosus-gracilis Preparation. Dis- 

 sect out the semimembranosus and gracilis muscles of both sides, 

 using the same precautions as in the previous preparations. 

 Both femurs should be disarticulated at the hips and the pelvis cut 

 through transversely, thus leaving the two muscles joined by a thin 

 piece of bone. This may be secured in the femur clamp. 



3. The Sartorius. This corresponds to the muscle of the same 

 name in human anatomy. It is a long, thin muscle having its ori- 

 gin from the symphysis pubis and its insertion into the capsule of 

 the knee, fascia of the leg, and tibia. This muscle is to be used 

 where parallel fibres are desired. 



V. ELASTICITY or MUSCLE. 



Make a gastrocnemius-muscle preparation, clamp the femur in 

 the femur clamp, attach the tendon to the lever of the myograph, 



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