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2 IO ANATOMY. Part II. the bafis of the firft metatarfal bone, and alfo a little in TIBIALIS GRACILIS vulgo PLANTARIS. the bafis of the os cuneiforme majus. This is a fmall pyriform mufcle, fituated obliquely in the ham below the external condyle of the os femoris, between the popliteus and gaftrocnemius externus; and Sect. XII. The- Muscles which move the its tendon, which is long, flat, and very fmali, runs Metaiarfus and Toes. down on the fide of the galtrocnemius internus, all the way to the heel. The flefhy body, which is only about two inches in EXTENSOR POLLICIS LONGUS. length, and one in breadth, is fixed, by a Ihort flat ten- This is a thin fingle mufcle, lying between the tibialis don, above the outer edge of the exterior condyle of the os femoris, bn one fide of the gaftrocnemius externus. anticus and extenfor digitorum longus, by which it is alFrom thence the flefhy body runs obliquely over the edge moftIt ishid.fixed to the infide of the fibula, near the interofof the popliteus, and terminates in a very fmall, long, feous ligament, from the neck down to the loweft quarflat tendon. , of that bone; to the interofl'eous ligament through This tendon runs between the body of the gaftrocne- ter fame fpace, and a little to the lower extremity of the mius externus and foleus, all the way to the inner edge the tibia next the fibula. of the upper part of the tendo Achillis ; and from thence There ends in a confiderable tendon, which palling continuing its courfe downward, it joins this tendon, and through aitdiftindt of the common annular ligament, is inferred, together with it, in the outfide of the pofte- and then through ring membranous vagina, is inferted in rior part of the os calcis, without communicating with the bafis of the firfta phalanx of the great toe, and contithe aponeurofis plantaris. nued from thence up to the fecond. TIBIALIS POSTICUS. FLEXOR POLLICIS LONGUS. This is a long, flelhy, penniform mufcle, broader a- This is a pretty long mufcle, fituated in the pofterior bove than below, fituated-between the tibia and fibula,, and lower part of the leg. on the back-fide of the leg, and covered by the extenfor It is fixed in the lower half of the back-fide of the fibula, its infertion reaching almoft as far as the external digitorum longus. It is fixed above, by fldhy fibres, immediately under malleolus. The fldhy body advances on the infide of the articulation of the tibia and fibula, to the neareft that bone towards the tibia, according to the oblique diparts of thefe two bones, chiefly to the tibia, reaching rection of that fide, and ends in a large tendon. to the lateral parts of that bone, above the interolTeous This tendon pafies behind the lower extremity of the tibia, toward the inner ankle, then through a fmall notchligament, which is here wanting. and back-fide of the aftragalus, and through From thence its infertion is extended below the oblique in the innerligament or ligamentary vagina, continued unline or imprefiion in the tibia, over all the neighbouring anderannular the lateral arch of the os calcis. part of the interofleous ligament, and through more than From thence it advances to the great toe, and palling the upper half of the internal angle of the fibula. After this, it forms a tendon, which runs down behind through the interftice between the two fefamoid bones, in ligamentary vagina of the firft phalanx, is inferted in the inner malleolus, through a cartilaginous groove and the an annular ligament, and, palfing under the malleolus, isin- the lower part of the fecond. Ibrted in the tuberofity or lower part of the os fcaphoides. THENAR. Peron.5Eus Maximus vulgo PERONiEus Posterior. This mufcle is made up of feveral portions, and lies on the inner edge of the foie of the foot. This is a long penniform mulcle, lying on the fibula. It is fixed, by three or four flelhy fafciculi, to the It is fixed above to the anterior and outer part of the lower and inner part of the os calcis, os fcaphoides, and head of the fibula, and to a fmall portion of the head of os cuneiforme majus. It is likewife fixed a little in the the tibia; then to the outfide of the neck of the fibula, annular ligament under the inner ankle, which belongs to the upper half of the external angle of that bone, and to the tendon of the flexor longus. to the aponeurofis tibialis, which at that place makes a From all thefe different infertions, the flefhy fafciculi ieptum between this mufcle and the extenfor pollicis. approach each other as they advance forward under the From thence turning a link backward, according to full bone of the metatarfus, and are fixed, partly in the the direction of the bone, it forms a confiderable tendon, internal fefamoid bone, and partly in the infide of the firft which, running behind the external malleolus, paffes phalanx, near its bafis. through a kind of hollow groove, and through an annular ligament common to it and to the tendon of the peroA N T I T H E N A R. nams medifis, which lies before it. Afterwards running through the oblique groove in the This is a fmall compound mufcle, lying obliquely unlower fide of the os cuboides, it is inferred in the fide of der the metatarfal bones. It
