The Secondary Ossification Center

Around the time of birth, secondary ossification centers begin to form in the epiphyses (see fig. 7.8b). Here, too, chondrocytes enlarge, the walls of matrix between them

Humerus

Radius

Ulna

Scapula

Ribs

Ossification Center

Cranial bones

Figure 7.10 The Fetal Skeleton at 12 Weeks. The red-stained regions are calcified at this age, whereas the elbow, wrist, knee, and ankle joints appear translucent because they are still cartilaginous. Why are the joints of an infant weaker than those of an older child?

Cranial bones

Humerus

Radius

Ulna

Scapula

Ribs

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