Glandular Tissues

Glandular Tissues

 

of plants (plant glandules), formations that perform the function of secreting drops of water or other substances.

There are several groups of glandules, including hydathodes, nectaries, and digestive, oily, resinous, mucous, and gum glandules. In insect-eating plants, the digestive glandules secrete digestive juices. Oily, resinous, mucous, and gum glandules secrete resins, essential oils, and other substances. They may be external or internal. External glandules are common in the bud scales (for example, of poplars or birches), leaves, and stems of many plants (of the family Labiatae and others); these glandules are a type of hair (sometimes called glandular hairs, for example in primroses and dead nettles). Internal glandules most often consist of tightly joined, mainly squamous, epithelial cells surrounding a cavity (intercellular space), into which they discharge the resins, essential oils, and other substances they have secreted. They are often visible (for example, in the leaves of citrus or St. John’s wort) as light, translucent spots. In a number of cases they are long (most often in the stems and roots) and tubular, and for the most part they are connected to one another. Sometimes internal glandules are single cells or groups of cells in which the substances they have elaborated accumulate (most often essential oils). The secretions of glandular tissues may have practical application (for example, oleoresin and essential oils). Some of them are poisonous.

References in periodicals archive ?
It is characterized by physical, chemical and usually, bacteriological changes in milk and pathological changes in glandular tissues (Radostis et al., 2001).
In the case herein described, there was no spontaneous regression of the vulvar masses after parturition; spontaneous regression and the histological appearance of mammary gland tissue at the vulvar are the hallmarks of the ectopic glandular tissues described in Nubian and Syrian goats (GAMEEL et al., 1992).
Masses and glandular tissues have very different shapes.
As breast development continues the fibrofatty and glandular tissues increase.
Instead, most glandular tissues from treatment groups revealed focal lymphocytic infiltration.
Sialolipoma is a new variant of salivary gland lipoma, consisting of both adipose and glandular tissues. Lipoma and sialolipoma can be differentiated from one another microscopically by the lack of entrapment of normal salivary gland acini and ducts [13,14].
(2) Possible origins of adenocarcinomas of the external auditory meatus in people include ceruminous or sebaceous glands, direct invasion from the parotid gland, or distant metastasis from other glandular tissues. (3) Based upon the absence of other foci of malignant glandular neoplasia, this bird's neoplasia most likely originated from the glands of the external auditory meatus.
The real part of the glandular tissues is underestimated for all images, but more for MS--an underestimation is also visible in Fig.
Mucins are complex carbohydrate secreted by different types of epithelial cells and glandular tissues of alimentary tract.
After parenchymal dissection from the pectoral fascia, the glandular tissues were approximated by sutures, and closure was performed without separating the skin from underneath glandular tissue so there is no danger of irradiating thin skin flaps.
However, iodine has many other uses in the body, including maintaining the normal architecture of all the glandular tissues including the breast, ovary, and uterus.
The seven-time Grand Slam winner was diagnosed with Sjogren syndrome, the disease that affects glandular tissues - most notably the tear and saliva glands.