CHAPTER 6 Skeletal System: Bones and Bone Tissue
173
Diaphysis
(a)
(b)
Adult bone
Osteons(haversian systems)
Innerlayer
Periosteum
Outerlayer
Compact bone
Spongy bonewith trabeculae
Medullarycavity
(c)
Adult bone
FIGURE 6.9
Long Bone
The femur (thighbone) serves as a model of the parts of a long bone. (
a
) The presence of epiphyseal plates, as well as the condition of the diaphysis andepiphyses, shows that this is a young bone. The femur is unusual in that it has two epiphyses at its proximal end. (
b
) Adult long bone with epiphyseal lines.(
c
) Internal features of a portion of the diaphysis in (
a
).