Question

Which of the following bones or bone structures forms primarily due to endochondral ossification?

a) Skull bones
b) Clavicle
c) Mandible
d) Femur

Answer 1

The femur is the bone that primarily forms by endochondral ossification, a process where long bones are formed from hyaline cartilage.

Step-by-step explanation:

d) Femur. Endochondral ossification is a process where bones are formed by replacing a cartilaginous template with bone tissue. The femur, which is the thigh bone and the longest bone in the human body, is a prime example of a bone that forms primarily through endochondral ossification. During fetal development, a cartilaginous model of the femur is first laid down, and over time, this cartilage is gradually replaced by bone tissue. This process is common in the formation of long bones, such as the femur, humerus, and tibia, contributing to their growth and development in the skeletal system. In contrast, options a, b, and c involve bones or structures that form through intramembranous ossification or a combination of both ossification processes.