Avian and ratite medullary bone

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Bird medullary bone serves as a secondary bone tissue that supplies calcium for eggshell production and lacks biomechanical function. It is characterized by its brittleness, with spicules easily separating from the originating layer. The discussion raises questions about the thin basal layer of medullary bone, specifically its attachment to the cortex and whether it possesses any mechanical strength. There is speculation that this basal layer may eventually detach completely from the cortical bone over time, leading to its total removal from the cortical bone wall.
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Bird medullary bone is described as a secondary bone tissue that provided calcium for producing eggshell, and have no biomechanical function. Bird medullary tissue is a very brittle and fragile type of bone that the spicules of medullary bone easily separated from the originating layer, but why the thin basal layer remains attached to the cortex? Did the thin basal layer have any mechanical strength or will it eventually completely separated from cortical bone after sometime? I think the medullary bone will be totally removed from the bone marrow.
 
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Munyit said:
I think the medullary bone will be totally removed from the bone marrow.

Sorry I mean the medullary bone will be totally removed from the cortical bone wall.
 

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