yiUSCLKS OF THE VOSTERIOH LIMBS. 



367 



!. Gastrocnemius, or Gemelli of the Tibia (Gastrocnemius Externus) 



(Figs. 201, 22 ; 203, 20). 



Hynonyms. — Bifemoro-calcaneus — Girard. 



Situation — Composition — Extent. — The gemelli of the leg, situated behind the 



Fig. 203. 



MUSCLES ON INNER ASPECT OF LEFT POSTERIOR LIMB. 



1, Crest of the ilium; 2. section throuofh it; 3, sncro-sciatic ligament; 4, pyriformis; 5, posterior 

 portion of sacro-sciatic lisjament ; 0, tuberosity of ischium ; 7, anterior portion of ischium, sawn 

 through; 8, pubis; 9, obturator foramen; 10, external iliac artery and vein, 11; 12, obturator 

 artery and vein (the figures are placed on the internal obturator muscle); 13, long adductor of 

 the leg, or sartorius ; 14, small adductor of the thigh, or adductor parvus; 15, short adductor 

 of the leg, or gracilis; 16, rectus of the thijh ; 17, vastus internus ; 18, patella, with insertion 

 of rectus; 19, upper extremitv of tibia; 20, gastrocnemius; 21, popliteus; 22, oblique flexor 

 of the phnhinges, or flexor pedis acressorius. with its temlon, 34; 23, perforans muscle, with its 

 tendon, 35; 24, flexor metatarsi ; 25, anterior extensor of the phalanges, or extensor pedis; 26, 

 annular ligament ; 27, tendon of flexor metatarsi, and its cune;in branch. 28; 29, tendon of the 

 superficial flexor of the phalanges; 30, tendon of gemelli or gastrocnemius; 31, os calcis ; 

 32, astragalus; 33, perforat us tendon ; 34, tendon of oblique flexor joining the perforans 

 tendon, 35 ; 36, large metatarsal bone ; 37, extensor pedis tendon ; 38, terminal knob of small 

 metatarsal bone. 



fenioro-tibial articulation, below the ischio-tibial muscles, constitutes two thick 



