Diameter of pigment granules in cortical cells (most probably in human hair)

Range 0.2 - 0.8 µm
Organism Unspecified
Reference Robbins, Clarence R. Morphological and macromolecular structure, pp.1-38, chapter 1 in the book Chemical and physical behavior of human hair / Clarence R. Robbins.-2nd ed (2002) p.19 4th paragraph
Primary Source [51] Gjesdal F: Investigation on the melanin granules with special consideration of the hair pigment. Acta Pathol Microbiol Scand 47 (Suppl 133): 1-112, 1959
Comments P.19 4th paragraph: "Cortical cells also contain pigment granules and nuclear remnants. The nuclear remnants are small, elongated cavities near the center of the cells. The pigment granules are small, oval or spherical particles of approximately 2,000 to 8,000 angstrom units (0.2 to 0.8 microns) in diameter [primary source] that are dispersed throughout the cortical cells. Both these structures comprise only a small fraction of the cortex. Generally, pigment granules do not occur in the cuticle of scalp hair: however, pigment granules have been observed in the cuticle and the medulla of beard hair, especially in heavily pigmented hair [ref 48]."
Entered by Uri M
ID 116473