Atlas of Plant and Animal Histology
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Animal tissues: Connective, Bone.

COLLAGEN FIBERS
Bone: A) Jaw; trabecular bone with interwoven fibers.
Species: Dog (Canis familiaris; mammal)
Technique: Abraded surfaces plus polarized light microscopy.

Bone: B) Tibia; compact lamellar bone.
Species: Human (Homo sapiens; mammal)
Technique: Abrade plus polarized light microscopy.

Bone: C) Tibia; compact osteonic bone
Species: Human (Homo sapiens; mammal)
Technique: Abrade plus polarized light microscopy.

D. Santiago Gómez Salvador (Dept. Anatomical Pathology, Faculty of Medicine, University of Cádiz. Spain) is the author of the pictures and co-author of the text.

A) Picture showing trabecular bone, non laminar, where collagen fibers are irregularly organized. Osteocytes are hardly distinguished but appear as small dark spots. This disposition of collagen fibers is typical of bones of less developed vertebrate, whereas more complex vertebrates show this type of bone transiently and located in specific places. For example, it is transiently formed at the beginning of osteogenesis, as in fetuses and newborns, and it is later replaced by trabecular lamellar bone. In adults, it can be found close to the sutures of the flat bones, in dental alveoli, and in some points of the tendon insertions. It is also found in fractures during bone repairing or in some bone tumors. In these examples the bone formation is secondary as it is deposited on preexisting bone. The image A is from a jaw that suffered a traumatic process and osteodistraction.

B) Image showing compact lamellar bone. This type of bone is synthesized during the osteogenesis of the tibia diaphysis. This arrangement of fibers is set in the vicinity of periosteum and endosteum, where it forms the outer and inner circumferential system, respectively.

C) The compact osteonic bone can be found internally to the compact lamellar bone. In osteon, collagen fibers are arranged around a central channel called Haversian canal. Blood vessels run through Haversian channels. The collagen fibers are organized in bands referred as lamellae, where the cell bodies of osteocytes are found. (see osteon)


Updated: 2014-12-12