Lacuna
Definition
A small lens-shaped cavity within bone lamellae that houses an osteocyte cell body. Lacunae are connected by canaliculi radiating toward the Haversian canal. Their presence is used to distinguish mammalian bone from fish (acellular) bone in forensic histological species determination.
- Cell housed
- Osteocyte (mature bone cell)
- Shape
- Lens-shaped cavity
- Forensic use
- Species identification (mammal vs. fish bone)
Common questions
What is a lacuna in bone tissue?+
A lacuna is a tiny, lens-shaped cavity within bone layers that holds an individual bone cell called an osteocyte. Small channels called canaliculi radiate from each lacuna toward the main Haversian canal, allowing the bone cell to communicate and exchange nutrients with the blood supply.
Why do forensic anthropologists care about lacunae?+
Lacunae are present in mammalian bone but absent in fish bone. By examining bone under a microscope, forensic experts can use the presence or absence of lacunae to identify whether a bone specimen came from a mammal or a fish, which is a key step in species determination.
What's a lacuna in forensic interpretation?+
In legal interpretation work, a lacuna describes a concept that exists in the original language but has no direct equivalent in the target language. Interpreters must then approximate or explain the concept, which inevitably loses some legal precision in the translation.
Related terms
- Consecutive Interpretation
- The interpreter waits for the speaker to complete a stretch of speech, then renders it into the target language. Common in witness...
- 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...
- Hedge
- A lexical or grammatical signal of uncertainty, approximation, or qualification: 'I think', 'about', 'maybe', 'something like that'. Omitting hedges makes tentative statements...
- 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...
- 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...
- Register
- The variety of language associated with a particular situation, task, or relationship. Register varies along dimensions of formality, technicality, and interactional mode....
- Simultaneous Interpretation
- The interpreter renders speech in real time as it is produced, typically used in international tribunal settings. Cognitively demanding and more prone...
- 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...
Explained in these topics
- Bone Biology and the Haversian BaselineA small lens-shaped cavity within bone lamellae that houses an osteocyte cell body. Lacunae are connected by canaliculi radiating toward the Haversian canal. T...
- Interpreter Issues in Legal Settings: Accuracy, Role, and FailuresA concept in the source language for which no equivalent exists in the target language. Interpreters must gloss, approximate, or explain, each solution involvi...