THE SUPPORTING TISSUES. 



83 



really consists of three bones, which have grown together, 

 the large flat upper ilium, which connects with the sacrum, 

 the lower ischium, which supports the weight of the body 

 in a sitting posture, and the forward pubic bone, which by 



Fig. 31. ADULT MALE PELVIS, SEEN FROM BEFORE. (Upper.) 



ADULT FEMALE PELVIS, SEEN FROM BEFORE. (Lower.) 



(After Allen Thompson.) 



articulating with the pubic bone on the other side forms the 

 front wall of the pelvis. The large articulating facet for the 

 head of the femur is called the acetabulum. A large hole 

 formed through the bone, the thyroid foramen, serves for 

 the exit of nerves and blood vessels from the pelvic cavity. 

 Attached to the innominate bone is the femur, the long bone 

 of the thigh. This articulates at the knee with the tibia. 



