Beginners' zoology . How many toeson the fore foot or hand .? On the hind On whichfoot is one of the toes rudimentary .? Why is the fore limbof no assistance in propelling the body in jumping .? Dothe toes turn in or (Fig. 250.) How does the froggive direction to the jump .? What wouldbe the disadvantageof always jumpingstraight forwardwhen fleeing? Whichlegs are more usefulin Divisions of theLimbs. — Distinguishthe upper arm, fore-arm, and hand in thefore limb (Figs. 252 and 253). Compare with skeleton ofman (Fig. 399). Do the arms of a man and a frog bothhave one bon
Beginners' zoology . How many toeson the fore foot or hand .? On the hind On whichfoot is one of the toes rudimentary .? Why is the fore limbof no assistance in propelling the body in jumping .? Dothe toes turn in or (Fig. 250.) How does the froggive direction to the jump .? What wouldbe the disadvantageof always jumpingstraight forwardwhen fleeing? Whichlegs are more usefulin Divisions of theLimbs. — Distinguishthe upper arm, fore-arm, and hand in thefore limb (Figs. 252 and 253). Compare with skeleton ofman (Fig. 399). Do the arms of a man and a frog bothhave one bone in the upper arm and two in the forearm ?Both have several closely joined bones in the wrist and. Fig. 252. — Skeleton of Frog. 132 BEGINNERS ZOOLOGY five separate bones in the palm. Do any of 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
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
