Embriología. Taller #7 Osificación intermembranal.

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Information about Embriología. Taller #7 Osificación intermembranal.

Published on November 7, 2013

Author: biolariel

Source: slideshare.net


Universidad Autonoma de Baja California.
Unidad de ciencias de la salud.
Presentacion con notas sobre osificacion intermembranal.




M.O. = Matriz ósea An ossification center appears in the fibrous connective tissue membrane. Selected centrally located mesenchymal cells cluster and differentiate into osteoblasts, forming an ossification center. 4


Bone matrix (osteoid) is secreted within the fibrous membrane. Osteoblasts begin to secrete osteoid, which is mineralized within a few days. Trapped osteoblasts become osteocytes. 6


Woven bone and periosteum form. Accumuating osteoid is laid down between embryonic blood vessels, which form a random network. The result is a network of trabeculae. Vascularized mesenchyme condenses on the external face of the woven bone and becomes the periosteum. 8




Bone collar of compact bone forms and red marrow appears. Trabecuae just deep to the periosteum thicken, forming a woven bone collar that is later replaced with mature lamellar bone. Spongy bone consisting of distinct trabeculae, persists internally and its vascular tissue becomes red marrow. 12



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