. Physiology, experimental and descriptive . alf muscle. There should now remain the Thigh-Bone, with the SciaticNerve running to the Calf Muscle suspended below. Fastenthe thigh-bone to some support, such as -a clamp or ring on aretort stand. Attach a small hook to the tendon, and suspendfrom it a slight weight, such as a small key. Such a preparation is called a Nerve-Muscle Preparation. 14 MOTION. It should frequently be moistened with a .7 per cent solu-tion of common salt in water, called Normal Saline Solution. Now take a sharp pair of scissors, and snip off the shortestpossible portion
. Physiology, experimental and descriptive . alf muscle. There should now remain the Thigh-Bone, with the SciaticNerve running to the Calf Muscle suspended below. Fastenthe thigh-bone to some support, such as -a clamp or ring on aretort stand. Attach a small hook to the tendon, and suspendfrom it a slight weight, such as a small key. Such a preparation is called a Nerve-Muscle Preparation. 14 MOTION. It should frequently be moistened with a .7 per cent solu-tion of common salt in water, called Normal Saline Solution. Now take a sharp pair of scissors, and snip off the shortestpossible portion of the upper end of the sciatic nerve. Ifthe muscle is closely watched at the time when the nerveis cut, it will be seen to thicken and shorten, and to lift theweight. If the muscle be held between the thumb and fingerwhile the nerve is pinched (and the scissors are the surestpinchers) it will be felt to harden. This experiment should be repeated, varying the weight,until it is made very clear that when the nerve is stimulated Sciatic Nerve. SHORTENED ELONGATED Fig. 3. Action of the Calf Muscle of the Frog, showing the Relations of theSciatic Nerve. the Muscle Shortens (which is the most important fact aboutthe action), thickens, and grows harder. Structure of Muscle. — Chipped beef shows well thestructure of muscle. Looking at a piece closely we see a net- STRUCTUKE OF MUSCLE. 15
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