Glandular acinus

Spheroidal mucous membranes of an exocrine gland (up and down), surrounded by serous cells (Demilune).
Image center: glandular duct (Duct).

The glandular acini are the multicellular epithelial structures where the secretory cells of an exocrine gland are found.
Glandular acini make up the parenchyma, the secretory part or adenomere, in an exocrine gland. exocrine.

Structure

File:Compound Acinar Gland.png

Acinos in green, on the left).

The secretory sector of the gland is called adenomere and is recognized as parenchyma.
The stroma surrounds the adenomere and is the supporting connective tissue.

Glandular acini are called adenomeres when they have a compact spheroidal structure, with a non-existent or minimal central canalicular lumen. The term acino derives from Latin and means "grape" and therefore acinar means "grape-shaped".

Cross-section of an acinerating gland. With myoepithelial cells

Since the complete acinus is spheroidal and the lumen of the canal is tubular, the cells forming the acini show a pyramidal shape with the cusp facing the lumen.

The secretory cells of the acinus represent the epithelium#Simple cuboidal epithelium. They have a rounded basal nucleus. They are in close contact with adjacent cells.
Acinar epithelial cells have a marked polarity. Its apical pole releases secretory granules into the lumen of the canal. Its basal pole rests on the connective stroma.

Ultrastructure of the basal sector of the acini shows myoepithelial cells resting on a basal lamina.

Types of glandular acini

• Salivary glandular axles

Salival acinos are characteristic and have mucous, serous and mixed components (submaxillary gland).

• Breast glandular steels

The lobes of the breast gland consist of groups of alveoles (acins) that contain lactocytes the secret epithelial stem cells, which synthesize the breast milk.

The acinar stroma is the part formed by the supporting tissues: connective tissue. Through the stroma come the innervation and blood circulation.