Trabecular (Cancellous) Bone
Definition
The porous, lattice-like interior bone occupying epiphyses, metaphyses, and flat bones. High surface area and metabolic activity but rapidly lost in taphonomic sequences. Provides limited forensic histological data but is the primary site of skeletal age change at the pubic symphysis and auricular surface.
- Location
- Epiphyses, metaphyses, flat bones
- Structure
- Porous, lattice-like interior
- Taphonomic behaviour
- Lost rapidly compared to cortical bone
- Histological value
- Limited, due to rapid post-mortem loss
- Key forensic use
- Pubic symphysis and auricular surface age estimation
Common questions
Why is cancellous bone still central to age estimation despite degrading quickly?+
The pubic symphyseal face and auricular surface, both cancellous-rich regions, undergo visible, progressive morphological changes with age. Examiners score these surfaces directly rather than relying on histological survival, so degradation of the internal microstructure does not prevent the method.
What happens to cancellous bone first in remains exposed to the elements?+
Its high porosity and surface area make it the first tissue lost to weathering, insect activity, and scavenging, often leaving only the denser cortical shafts intact by the time older or long-exposed remains are recovered.
Related terms
- Cortical (Compact) Bone
- The dense outer shell of long bones and the tables of flat bones. Approximately 80% of skeletal mass. High mineral density (65-70%...
- Epiphyseal Growth Plate (Physis)
- The cartilaginous zone between the epiphysis and metaphysis where endochondral ossification occurs during growth. Closes (fuses) at puberty under the influence of...
- Haversian System (Secondary Osteon)
- The basic structural unit of mature cortical bone: a cylinder of 4-20 concentric lamellar rings around a central Haversian canal carrying blood...
- Interstitial Lamellae
- The angular remnants of older osteons left behind after a BMU has partially resorbed them. Their relative area decreases with age as...
- Kerley Method
- A histological age estimation method published by Ellis Kerley in 1965, based on counting secondary osteons, osteon fragments, circumferential lamellar bone, and...
- Lacuna
- A small lens-shaped cavity within bone lamellae that houses an osteocyte cell body. Lacunae are connected by canaliculi radiating toward the Haversian...
- Osteoclast
- The large, multinucleated bone-resorbing cell responsible for excavating the resorption tunnel in a BMU. Activated by the RANKL/OPG cytokine axis. Creates the...
- Plexiform Bone
- A microstructural pattern found in the cortical bone of large rapid-growth mammals (bovids, horses, deer) characterised by alternating layers of woven bone...
- Wolff's Law
- The principle that bone is deposited and resorbed in response to mechanical loading history. Cortical thickness and trabecular orientation follow principal stress...