MUSCLES OF TEE POSTEBIOB LIMBS. 



367 



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

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



Synonyms. — Bifemoro-calcaneus — Girard. 



Situation— Comj)ositio7i—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 through it; 3, sacro-sciatic ligament; 4, pyriformis; 5, posterior 

 portion of sacro-sciatic ligament ; 6, 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 thish ; 17, vastus internus ; 18, patella, with insertion 

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

 of the phalanges, or flexor pedis accessorius, with its tendon, 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 cunean branch. 28 ; 29, tendon of the 

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

 32, astragalus; 33, perforatus 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. 



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



