By Robert R. Ogle Jr., Michelle J. Fox
It fills a void within the assets to be had to researchers and practitioners in forensic hair exam by way of offering photographic archetypes for the microscopic features of human hair and the variates of the features visible in forensic examinations, together with curl; colour; pigment distribution and density; cortical fusi; and ovoid our bodies. those illustrations supply a uniform foundation for describing the features and their adaptations for forensic execs in differing geographical parts. The documentation of hair features utilizing the scoring method defined during this atlas permits researchers to increase information in regards to the frequency of features in the hairs of 1 or extra participants and the review of even if yes hair features are co-dependent.
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Additional resources for Atlas of Human Hair: Microscopic Characteristics
When scoring the pigment distribution for those hairs, the examiner should categorize the hair as having central distribution, even though the distribution may be an artifact resulting from optical effects. Some examiners may find it necessary to examine a cross-section of the shaft to determine and document the actual pigment distribution. 5 Pigment Aggregate Shape Pigment aggregate shape refers to the appearance of the pigment granules when they are concentrated in a mass that has a recognizable form.
In some hairs, a “continuous” medulla may have portions that are opaque and portions in which the medullary cells are visible and translucent. Traditionally, some examiners have judged the continuity of the medulla based on the continuous nature of the opaque form only. The approach suggested here is to judge the continuity of the medulla based on both the opaque and translucent forms. 8 Medulla Opacity Medulla opacity refers to the appearance of the medulla as viewed with transmitted light in the compound light microscope.
The concentration of cortical fusi is not presented here as a quantitative measurement but is determined in a study hair by comparison to the photographic archetypes. , opaque hair). 16 Ovoid Bodies Ovoid bodies exist in the hair cortex and are aggregations of pigment that can have a spheroidal or oblong shape. Ovoid bodies can range in diameter from 3 to 20 µm; however, this size range may not be all inclusive. The variates for ovoid bodies relate to the abundance of ovoid bodies present in the hair shaft.