. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. LOCOMOTION. 657 . of the biceps and extensors f one another. IP-"^ e«tasses behind a ace the uncor- fall backward, lind the knee- joints somewhat, which would also favor falling backward (bending of the knees). 4. The line of gravity of the whole body passes in front pf a line j
. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. LOCOMOTION. 657 . of the biceps and extensors f one another. IP-"^ e«tasses behind a ace the uncor- fall backward, lind the knee- joints somewhat, which would also favor falling backward (bending of the knees). 4. The line of gravity of the whole body passes in front pf a line joining the two ankle-joints, so that the body would tend, but for the contraction of the mus- cles of the calves of the legs, to fall forward. Taking these different facts into consideration explains the various directions in which an individual, when erect, may fall according as one or the other line (center) of gravity is dis- placed for a long enough time. Walking (man) implies the alternate movement of each leg forward, pendulxuu-like, so that for a moment the entire body 4«<T 8*1011 It IS 14. Fio. 493.âShowa the sUnultaaeoua portions of both lega during ⢠step, divided Into tour groupa (after Weber). Firat group (A), 4 to 7, givea the different podtiona which the lega â fanultaneoualy aaram» while botn are on the ground; leoond group (B). 8 to 11, ahowa the varioua poaitiona of both lega at tho time when the poaterior leg la elevated from the ground, but behind the supported one; third group (C), IS to 14, shows the positions which the lega asauine when the awloging leg overtakea the standing one; and the fourth group (m, 1 to a. the poaittons during the time when the swinging leg Is propelled in advance of the resting one. The letters a, 6, and « Indioate the aoglsa fonned I7 the bonea of the right leg when engaged in making a step: tiie letteis m, â¢Â», and o, the poai- tiona assumed bytherlght foot when the trunk is rolliiig over It: 0, show
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Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1880, bookyear1889
