Beginners' zoology . f the frogsfingers have three joints ? Compare also the leg of man and the hind legof the frog ( and 399). Doesthe thigh have onebone in each ? Theshank of man hastwo bones, shin andsplint bone. Doyou see a groovenear the end in theshank bone of afrog (Fig. 252), in-dicating that itwas formed by the union of a shin and Fig. 253. — Skeleton OF Frog. r ...u :> t-i ^^ a sphnt bonerThe first two of the five bones of the ankle are elongated, giv-ing the hind leg the appearance ofhaving an extra joint (Fig. 253). Thefoot consists of six digits, one of which,like the t
Beginners' zoology . f the frogsfingers have three joints ? Compare also the leg of man and the hind legof the frog ( and 399). Doesthe thigh have onebone in each ? Theshank of man hastwo bones, shin andsplint bone. Doyou see a groovenear the end in theshank bone of afrog (Fig. 252), in-dicating that itwas formed by the union of a shin and Fig. 253. — Skeleton OF Frog. r ...u :> t-i ^^ a sphnt bonerThe first two of the five bones of the ankle are elongated, giv-ing the hind leg the appearance ofhaving an extra joint (Fig. 253). Thefoot consists of six digits, one of which,like the thumb on the fore Hmb, isrudimentary. The five developed toesgive the five digits of the typical verte-brate foot. Besides the five bones cor-responding to the instep, the toes havetwo, three, or four bones each. Howis the hind foot specialized for swim-ming. Which joint of the leg con-tains most muscle.^ (Fig. 254.) Find other bones of thefrog analogous in position and similar in form to bones inthe human
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
