Interstitial Lamellae
Definition
The angular remnants of older osteons left behind after a BMU has partially resorbed them. Their relative area decreases with age as progressive remodeling replaces them with secondary osteons. Used as one of the four Kerley counting variables.
- Origin
- Remnants of osteons partially resorbed by remodeling
- Shape
- Angular, lacking a complete haversian canal
- Use
- One of four counting variables in histological age estimation
Common questions
What distinguishes them from an intact secondary osteon?+
They lack a complete haversian canal and cement line, because a later remodeling unit resorbed part of the original osteon before a new one was fully deposited over it.
Why are they counted for age estimation?+
Their presence reflects cumulative bone remodeling activity in a cross-section, so counting them alongside intact osteons and non-remodeled bone contributes one variable to Kerley-type histological age formulas.
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...
- 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...
- Trabecular (Cancellous) Bone
- The porous, lattice-like interior bone occupying epiphyses, metaphyses, and flat bones. High surface area and metabolic activity but rapidly lost in taphonomic...
- 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...