. A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . ue tothe close contigu-ity of the peroneal(external popliteal)nerve. Tlie posteriorcompartment of theleg is b\ far thelargest of the strong intermus-cular septum di-vides it transverse-ly into two (), separatingthe muscles into su-perficial and deepgroups. The su-perficial musclesform a well-markedgroup attached tothe teudo Achillis,and therefore acttogether as a form theprominence of thecalf before men-tioned, and consistof the gastrocn
. A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . ue tothe close contigu-ity of the peroneal(external popliteal)nerve. Tlie posteriorcompartment of theleg is b\ far thelargest of the strong intermus-cular septum di-vides it transverse-ly into two (), separatingthe muscles into su-perficial and deepgroups. The su-perficial musclesform a well-markedgroup attached tothe teudo Achillis,and therefore acttogether as a form theprominence of thecalf before men-tioned, and consistof the gastrocne-mius superficially,under it the soleus,which considerablyexceeds it in size,and the insignifi-cant p 1 a n t a r i anatomistsdescribe the gastro-cnemius as twomuscles, and fiomthis conceptionarises the Frenchname Us with thesoleus the wholemuscular complexis known as the tri-ceps extensor two heads ofthe gastrocnemiustake origin abovethe condyles of thefemur. It is, there-f o r e, a musclewhich controls twojoints, and its con-traction flexes the Tast net. Com. tibul Head of lib. JTib. Fro. 3185. knee and at the same time extends the foot. When it isaffected by rheumatism it may cause spurious ankylosisof the knee-joint. The coexistence of extension of thefoot will enable the observer to make a diagnosis. Thefibres of either liead are arranged in a beautiful peniii-form manner around a tendon which cannot be com-pletely displayed until the muscle is cut and turnedback. Its coadjutor, the soleus, does not pass over theknee-joint, but is attached to the tibia and the fibula,throwing across between the two a fibrous arch of fasciawhich protects fiom compression thevessels as they pass under it. The gas-trocnemius and the soleus are lemaik-ably subject to cramps. This muscularaffection, which appears usually to bean irregular muscular action, indepen-dent of the nervous s}stem, may bebrought about b} slight causes, such asa draught of air b
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