secretory granule

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se·cre·to·ry gran·ule

a membrane-bound vesicle, usually containing protein synthesized in the rough endoplasmic reticulum. The protein is delivered to the Golgi complex and is packaged in the trans-Golgi network as secretory granules.


(gran'ul?) [L. granulum, little grain]
1. A small, grainlike mass.
2. In histology, a small intracellular mass that has no apparent internal structure.

acidophil granule

A granule that stains readily with acid dyes.

albuminous granule

A cytoplasmic granule in many normal cells. It is not affected by ether or chloroform, but disappears from view when acetic acid is added.

amphophil granule

Beta granule.

azurophilic granule

A small red or reddish-purple granule that easily takes a stain with azure dyes. Found in lymphocytes and monocytes, it is inconstant in number, being present in about 30% of the cells.

basal granule

Basal body.

basophil granule

A cellular granule that stains with a basic dye.

beta granule

An azurophil granule found in beta cells of the hypophysis or islets of Langerhans of the pancreas that stains with both acid and basic dyes. Synonym: amphophil granule

chromophil granules

Nissl body.

cone granules

The nuclei of the cones, sensory cells of the retina. They form the outer zone of the outer nuclear layer of the retina.

delta granule

A small granule in the delta cells of the pancreas.

eosinophil granule

One of various granules that react with acid dyes. It is present in eosinophils.

glycogen granule

One of the minute particles of glycogen seen in liver cells following fixation.

juxtaglomerular granule

A granule found within the juxtaglomerular cells of the kidneys. Juxtaglomerular cells secrete renin.

Kölliker interstitial granule

A granule in the sarcoplasm of a striated muscle fiber.

metachromatic granule

An irregularly sized granule found in the protoplasm of numerous bacteria. It stains a different color from that of the dye used.

Much granules

See: Much granules

neutrophil granule

Any of the cytoplasmic granules of a neutrophil that often stain a pale blue.

Nissl granules

Nissl bodies.

pigment granule

A granule seen in pigment cells.

Plehn granule

A basophilic granule seen in the conjugating form of Plasmodium vivax.

protein granule

A minute protein particle found in cells.

rod granule

A nucleus of a rod photoreceptor found in the retina.

Schüffner granules

See: Schüffner, Wilhelm A. P.

secretory granule

Zymogen granule.

seminal granule

One of the minute particles in semen, supposed to derive from disintegrated nuclei in nutritive cells from seminiferous tubules.

zymogen granule

A granule present in gland cells, esp. the secretory cells of the pancreas, the chief cells of the gastric glands, and the serous cells of the salivary glands. It is the precursor of the enzyme secreted.
Synonym: secretory granule
References in periodicals archive ?
Secretory granule of the cells did not have a membrane, and the electron density was the lowest among the six types of secretory cells (Fig.
The number of these cells increased with increasing foetal age and they could be clearly stained with Lead-Haematoxylin stain at about 14 weeks and the secretory granules became more prominent.
Proteins could be also involved in 1) intracellular transport of cholesterol or intermediate steroids, as has been described for adrenocortical cells or insect prothoracic glands (Feuilloley and Vaudry, 1996, Birkenbeil, 1983), and 2) in the storage of steroid hormones in secretory granules, as suggested for the DB cells of Helisoma duryi (Saleuddin et al.
americanus ultrastructure are crystals, which are an order of magnitude larger than that of the secretory granules described by Neff (1971a) from the lumen of the calcium-secreting glands.
Electron microscopy revealed secretory granules in atrial myocytes, which structurally resembled storage granules in peptide-hormone-producing cells (1, 2).
Acid hydrolases and tryptase from secretory granules of dispersed human lung mast cells.
Chromogranin A (CgA) is a member of the granin family of acidic proteins that are found in the secretory granules of many endocrine and neuroendocrine cells.
Each mast cell contains, in secretory granules, powerful chemical mediators such as histamine.
Kidney sexual segments were enlarged and contained secretory granules in 16/17 (94%) of males undergoing spermiogenesis; 11/11 (100%) of males with regressed testes and 14/20 (70%) of males with recrudescent testes.
sepioidea OG secretory activity was demonstrated by the production of electron dense secretory granules in the sexually mature stage (Figs.