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Bone: cement lines
The outer boundaries of osteons are marked by cement lines. Cement lines have a high concentration of ground substance and, therefore, appear as basophilic bands around the osteons. Cement lines mark the transition between resorption and new growth, as well as indicating interruptions in a growth pattern, similar to tree rings. 200x
![Cement lines <p>The outer boundaries of these osteons are marked by cement lines. Cement lines have a high concentration of ground substance and, therefore, appear as basophilic bands around the osteons. Cement lines mark the transition between resorption and new growth, as well as indicating interruptions in a growth pattern, similar to tree rings. 200x</p>](https://digitalhistology.org/wp-content/uploads/2018/02/T.C.B.D.16.P01.png)
Cement lines
The outer boundaries of these osteons are marked by cement lines. Cement lines have a high concentration of ground substance and, therefore, appear as basophilic bands around the osteons. Cement lines mark the transition between resorption and new growth, as well as indicating interruptions in a growth pattern, similar to tree rings. 200x
![Inner circumferential lamellae <p>The outer boundaries of these osteons are marked by cement lines. Cement lines have a high concentration of ground substance and, therefore, appear as basophilic bands around the osteons. Cement lines mark the transition between resorption and new growth, as well as indicating interruptions in a growth pattern, similar to tree rings. 200x</p>](https://digitalhistology.org/wp-content/uploads/2018/02/T.C.B.D.16.P02.png)
Inner circumferential lamellae
The outer boundaries of these osteons are marked by cement lines. Cement lines have a high concentration of ground substance and, therefore, appear as basophilic bands around the osteons. Cement lines mark the transition between resorption and new growth, as well as indicating interruptions in a growth pattern, similar to tree rings. 200x
![Osteons <p>The outer boundaries of these osteons are marked by cement lines. Cement lines have a high concentration of ground substance and, therefore, appear as basophilic bands around the osteons. Cement lines mark the transition between resorption and new growth, as well as indicating interruptions in a growth pattern, similar to tree rings. 200x</p>](https://digitalhistology.org/wp-content/uploads/2018/02/T.C.B.D.16.P03.png)
Osteons
The outer boundaries of these osteons are marked by cement lines. Cement lines have a high concentration of ground substance and, therefore, appear as basophilic bands around the osteons. Cement lines mark the transition between resorption and new growth, as well as indicating interruptions in a growth pattern, similar to tree rings. 200x
![Resorption canal > <p>A resorption canal can be differentiated from an Haversian canal, because it is lined with an endosteum containing osteoclasts, has an irregular outline and is not surrounded by concentric lamellae.</p>](https://digitalhistology.org/wp-content/uploads/2018/02/T.C.B.D.16.P04.png)
Resorption canal >
A resorption canal can be differentiated from an Haversian canal, because it is lined with an endosteum containing osteoclasts, has an irregular outline and is not surrounded by concentric lamellae.
![Osteoclasts <p>A resorption canal can be differentiated from an Haversian canal, because it is lined with an endosteum containing osteoclasts, has an irregular outline and is not surrounded by concentric lamellae.</p>](https://digitalhistology.org/wp-content/uploads/2018/02/T.C.B.D.16.P05.png)
Osteoclasts
A resorption canal can be differentiated from an Haversian canal, because it is lined with an endosteum containing osteoclasts, has an irregular outline and is not surrounded by concentric lamellae.