VOLUNTARY MUSCLE. 21 



frog; cut through the tibia below its insertion and through the 

 femur above the knee. Remove it with the bone from which it 



FIG. 4. A ventral view of frog. 1, M. Gastrocnemius. 

 2, M. Tibialis anticus. 3, M. Gracilis. 4, M. Adductor mag- 

 nus. 5. M. Sartorius. 6. M. Adductor longus. 7, M. Vastus 

 internus. 8. N. Vagus. 9, N. Glosso-pharyngeal. 10, N. Hypo- 

 glossal. 11, N. Superior laryngeal. 



B. Dorsal aspect of hind leg. 12, M. Rectus anterior. 

 IS.M.Vastusexternas. 14,M.Semimembranosus. 15, M. Peroneus. 

 (After Jackson). 



arises. You should have a preparation with bone at each end. 

 Suspend the muscles by clamping one bone in the flat-jawed 

 clamp. Fasten the other end to a muscle lever to which a 



