Hair-Shaft Tubules
Definition
Microscopic cylindrical structures running along the length of the horn, structurally analogous to hair follicles. Their diameter, packing density, and internal structure vary between rhinoceros species and are diagnostic features under SEM.
- Location
- Cylindrical structures along horn length
- Analogous to
- Hair follicles, structurally
- Variable features
- Diameter, packing density, internal structure
- Diagnostic use
- Species discrimination under SEM
Common questions
Why are horn tubules examined under a scanning electron microscope rather than light microscopy?+
The species-diagnostic differences sit at the micron scale in tubule diameter and packing, which needs the resolution and depth of field an SEM provides to compare against reference species images.
What forensic question does tubule structure help answer?+
It helps confirm whether a seized horn or fragment came from rhinoceros and can support species-level identification within rhinoceros, which matters for wildlife trafficking prosecutions under CITES-linked laws.
Can tubule analysis work on processed or carved horn material?+
Carving and polishing can obscure surface tubule detail, so examiners generally need an intact cross-section or a fragment retaining unaltered internal structure for a reliable comparison.
Related terms
- Keratin
- The structural protein that forms pangolin scales, human fingernails, and bird feathers. In scales it is arranged in a layered matrix whose...
- Pseudo-Hunting
- A laundering scheme in which foreign nationals are recruited to participate in ostensibly legal trophy hunts in southern Africa, then export the...
- RhODIS
- Rhino DNA Index System. A national STR database for rhinoceros individuals maintained at the Veterinary Genetics Laboratory, University of Pretoria. Used to...
- STR Profiling
- Short tandem repeat profiling: the same multi-locus PCR-based method used for human identity testing, adapted for target species with species-specific primer sets....
- Ursodeoxycholic Acid (UDCA)
- A secondary bile acid that is the major active component in bear bile, present at far higher concentrations than in most other...