An introduction to physiology . rve. Cut through the femur about its middle. (Fig. 2.) Lay the sciatic nerve for safety along the gastrocnemius muscle. Fasten the lower fragment of the femur Fi°-2- Nerve-mus- cle preparation; gas-in the jaWS Of the mUSCle Clamp, trocnemius muscle cinil scititic nerve F Let the whole nerve rest with- end of femur stretching on the adjustable l?ha™aS-plate or nerve-holder, the filter meat of smaller ten- don of gastrocnemius paper Covering Which Should be to femur (Handbook , . , , ,. for the Physiological moistened with normal saline Laboratory).solu
An introduction to physiology . rve. Cut through the femur about its middle. (Fig. 2.) Lay the sciatic nerve for safety along the gastrocnemius muscle. Fasten the lower fragment of the femur Fi°-2- Nerve-mus- cle preparation; gas-in the jaWS Of the mUSCle Clamp, trocnemius muscle cinil scititic nerve F Let the whole nerve rest with- end of femur stretching on the adjustable l?ha™aS-plate or nerve-holder, the filter meat of smaller ten- don of gastrocnemius paper Covering Which Should be to femur (Handbook , . , , ,. for the Physiological moistened with normal saline Laboratory).solution ( per cent NaCl).Take care that the nerve does not dry betweenthe nerve-holder and the muscle. (Fig. 3.) Thefilter paper should reach from the nerve-holderto the muscle. Preliminary Considerations regarding Energy,Stimulation, and Irritability. — Pinch the musclesharply with the forceps. 8 GENERAL PROPERTIES OF LIVING TISSUES The muscle passes into the active state; itshortens and thickens. The foot, which is rela-. Fig. 3. The muscle clamp, stand, and nerve-holder. The nerve-holdersupports the sciatic nerve, together with the portion of the spinal columnfrom which it springs. The handle of the nerve-holder is of thick leadwire which may be bent as desired. The binding post on the muscle clampprovides electrical connection with the upper end of the muscle. tively less fixed than the leg, is extended. Thecontraction is followed by a slower relaxation orreturn to the original form. INTRODUCTION 9 Observe that the mechanical act of pinchingcaused the resting muscle to become active. Itsstored energy was transformed into external,mechanical work, i. e„ the moving of the all of the energy set free takes this easilyvisible form. It will be shown later that muchof it is made active as molecular motion, in theform of heat, chemical action, and which occasion a transformation ofenergy within the living body are termed stim-uli, and tissues whic
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