Archive image from page 471 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 458 MOTION. second only backwards, and the third neither backwards nor forwards. The length of the legs, measured from the hip-joint to the ground when standing erect, preponderates slightly over that of the body when taken from the distance of the crown of the head to the axis of the hip joint, conse- quently the centre of gravity is raised above the plane of position rather higher than the semi- distance from the head to the ground when the entire sole of th
Archive image from page 471 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 458 MOTION. second only backwards, and the third neither backwards nor forwards. The length of the legs, measured from the hip-joint to the ground when standing erect, preponderates slightly over that of the body when taken from the distance of the crown of the head to the axis of the hip joint, conse- quently the centre of gravity is raised above the plane of position rather higher than the semi- distance from the head to the ground when the entire sole of the foot is in contact with the earth. In consequence of the lengths of the femur and tibia being nearly equal, and of the zigzag direction which the limbs take during flexion, and because the angle of the greatest flexion of the knee-joint is nearly equal to the sum of the angles of the hip and ankle, it results that in the simultaneous flexion of these three joints, (provided the angle of in- clination of the foot to the ground continues 30°,) the trunk preserves its erect position as when standing, and therefore ascends and de- scends (by the flexion and extension of the legs) in the same vertical line. The greatest amount of elongation and contraction of the leg result- ing from the greatest extension and flexion of the hip, knee, and ankle-joints, may be easily ascertained by measuring with a line from the hip-joint to the head of the astragalus during such flexion and extension, and marking the difference in the length of the line in the two states. By this method the length is estimated by Weber as follows : In the greatest state of In the greatest state of The actual lengths of the several portions of the leg are Head of the femur to the condyles. . From the condyles to the convex articular surface of astragalus .. Axis of articulation of the astragalus to centre of foot During the greatest extension the
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