haversian canal การใช้

• These canals are called haversian canals.
• Each haversian canal is surrounding by varying number ( 5-20 ) of concentrically arranged lamellae of bone martix.
• Within the bone itself, the haversian canals become blocked with scar tissue, and the bone becomes surrounded by thickened periosteum.
• Haversian canals are contained within osteons, which are typically arranged along the long axis of the bone in parallel to the surface.
• However, it is generally agreed that endothermy first evolved in non-mammalian synapsids such as dicynodonts, which possess body proportions associated with heat retention, high vascularised bones with Haversian canals, and possibly hair.