The Humerus.—This is the largest and strongest bone of the upper extremity and is found in the arm between the shoulder and the elbow. It is the only bone in the arm.
The fore arm is that portion of the upper extremity which is situated between the elbow and the wrist. The fore arm has two bones, the ulna and the radius.
The Ulna.—A long thin bone, but larger than the radius, and situated on the inside of the fore arm.
The Radius.—So-called because it is the rotary bone of the fore arm. It is situated on the outside of the fore arm and parallel with the ulna.
The hand is subdivided into the wrist or carpus bones, the metacarpus or the bones of the palm, and the phalanges or the bones of the digits. There are twenty-seven bones in each hand.
The Bones of the Lower Extremities.
—The bones of the lower extremities consist of the pelvic girdle, the thigh, the leg and the foot.
The pelvic girdle consists of three portions, the ilium, the pubis, and the ischium.
The Ilium.—The ilium is the superior, broad and expanded portion and forms the prominence of the hip. The top part is called the crest.
The Ischium.—The ischium is the lowest portion of the girdle, and is the portion which supports the body when in a sitting position.