Buckmaster's Elements of animal physiology / by John Angell.

  • Angell, John
Date:
1866
Catalogue details

Licence: Public Domain Mark

Credit: Buckmaster's Elements of animal physiology / by John Angell. Source: Wellcome Collection.

    292/384 (page 280)
    The Metatarsal Bones compose the broad part and front of the arch of each foot, or its lower instep. Each foot com- prises five long bones, corresponding with the toes, and having a shaft and two extremities. The Phalanges of the foot, or the toes, coiTespond with those of the hand, there being fourteen on each foot. The Sesamoid Bones are little rounded masses connected with the tendons ; two of them are found under the metatarsal joint of each great toe. The arch of the foot gives great elasticity and grace in walking, running, dancing, and lessens the concussion in leaping and jumping. It is said that during the Crimean war many Russian soldiers belonging to comparatively flat-footed races were dis- abled by the long marches from the interior. Fig. 67.—Levers in the Human Body. 1. Lever of the first order (the ulna), moved by the triceps muscle at the back of the arm. 2. Lever of the second order (the os calcis), moved by the gastrocnemius muscle of the calf of the leg. 3. Lever of the third order (the radius), moved by the biceps muscle in the front of the arm. W represents the weight or resistance ; P, the power; and F, the fulcrum, or point of support. The kind of lever depends on the relative position of these points.