Question

8. When you place the humerus in the glenoid cavity (fossa) together and then place the femur into the acetabulum, which joint do you think is more likely to become dislocated? Explain. (2pts) 9. In the appendicular skeleton, what bone are we born with that starts out as flexible cartilage... but begins to turn into bone (ossification) when we are toddlers? Hint, you won't see it on the X-ray image of a new born. (1pts)

Answer 1

8.Humerus and glenoid cavity makes the shoulder joint and femur and acetabulum makes the hip joint.

Both joints are ball and socket joint. Yet, shoulder joint is much more prone to dislocation than hip joint . Compared to acetabulum i.e. the hip joint, the glenoid cavity is found to be relatively shallow. So the hip is much harder to dislocate, also because the socket is deeper and the ligaments and muscles are stronger and bigger.

9. The appendicular skeleton is made up of -

Shoulders

Pelvis

Arms

Legs.

Bone develops by replacing hyaline cartilage.

Eventually this hyaline cartilage will be removed and replaced by bone to become the epiphyseal line.