44 MANUAL OF ELEMENT ARY ZOOLOGY 



sm. 



. ad. 



pet. st. 



FlG. 21. — A ventral view of the muscular system of a frog. 



ad.long:, Adductor longus ; ad.mag,, adductor magnus ; a«c, anconaeus ; cor.rad^ 

 coraco-radialis ; crttr,^ crureus ; did., deltoid ; e o6. t external oblique; e.v/.cr. t 

 extensor crurisbrevis ; gast.* gastrocnemius; grac> gracilis; /.a., linea alba; 

 $ct.ab, % abdominal part of the pectoral muscle ; pd.st.^ sternal part of the 

 same ; r.ab, t rectus abdominis ; sar., sartorius ; sm, % mylohyoid ; t.z\, tendinous 

 intersections ; t.A. t tendo Achillis ; t.jl, tibiofibula ; tib.ant.y tibialis anterior ; 

 tib.$ost.) tibialis posterior ; x,c. t xiphoid cartilage. 



