Table of contents :
- granules : insoluble nonmembranous particles found in cytoplasm
- albuminous or cytoplasmic granules : granules seen in the cytoplasm of many normal cells; they optically disappear on the addition of acetic acid, but are not affected by ether or chloroform
- Kölliker's interstitial granules : various sized granules seen in the sarcoplasm of muscle fibers.
- glycogen granules
- pigments in pigment granules (small masses of coloring matter occurring in pigment cells)
- aleuronoid granules : colorless myeloid colloidal bodies found in the base of pigment cells.
- lipofuscin / lipofuchsin : wear and tear pigment (in residual bodies)
- hemosiderin = ferritin granules
- melanin : the dark amorphous pigment of the skin, hair, and various tumors, of the choroid coat of the eye and the substantia nigra of the brain. It is produced (melanogenesis) by polymerization of oxidation products of tyrosine and dihydroxyphenyl compounds, and contains carbon, hydrogen, nitrogen, oxygen, and often sulfur
- pheomelanins (melanosomes in melanocytes => keratinocytes)
- eumelanins / black melanins (melanosomes in melanocytes => keratinocytes)
- neuromelanins (neurons in the substantia nigra of Sommering and retinal pigment epithelium)
- melanogen : a colorless chromogen, convertible into melanin, which may occur in the urine in certain diseases, e.g., malignant melanoma..
- artificial or factitious melanin / melanoid : a compound resembling melanin, formed when a protein is heated in strong hydrochloric acid
- crystals : a homogeneous angular solid formed from a chemical element, compound, or isomorphous mixture, having a definite form in which the ultimate units from which it is built up are systematically arranged
- crystalloid : resembling a crystal
- Charcot-Böttcher crystalloids : slender spindle-shaped crystals 10 to 25 m long, commonly found in Sertoli cells of the human testis but not in other species
- crystalloids of Reinke : conspicuous, variously shaped, crystal-like structures contained in the cytoplasm (and rarely in the nucleus) of interstitial cells of Leydig.
- ferritin crystals : in Insects enterocyte, where hemosiderin can crystallize
- guanine crystals (in Amphibia keratinocytes)
- nucleoid (see peroxisome)