Innominate,    or    Hip-bone.

Femur,             „     Thigh-bone,

Patella,            „     Kneecap.

Tibia,               „     Shin-bone.

Fibula,             „     Splint-bone.

Tarsal,             „   Bones of foot.

Metatarsal,      „   Bones of foot.

Phalanges,      „   Bones of toes.

The innominate bone forms part of the pelvis. In early life it consists of three parts :

(1)  Ilium,

(2)  Ischium,

(3)  Pubis.

The junction of these three bones forms a cup-like cavity called the cotyloid cavity, or acetabulum, which receives the superior head of the femur and forms the hip-joint. The cavity is deeper than that of the shoulder, and is further deepened by a rim of fibro-cartilage, called the cotyloid ligament. The round head of the femur is more prominent than that of the humerus ; for these reasons the hip-joint is not so freely movable as the shoulder-joint.

The femur is a long, cylindrical bone, the longest and strongest in the skeleton. It consists of a superior and inferior head and shaft. The neck connects the superior head with the shaft ; below the neck are two protuberances, the greater and lesser trochanters, which give attachment to muscles.

Fig. 49.—Back of Femur (Left).

1, Head ; 2, great trochanter ; 3, less trochanter; 4, external condyle ; 5, internal condyle ; 6, linea aspera.

Down the back of the shaft there is a rough line running down called the linea aspera, to which muscles are also attached. The inferior head is flattened ; it has two tuberosities and two projections, called condyles, internal and external. There is a deep notch between called the intercondyloid notch. Several muscles of the leg are attached to the condyles of the femur.