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 ?
Classification of the different glands can be confusing and difficult because the different glandular tissues merge with each other.
In this report, we described a mucocele originating from the esophageal mucosal glands of an owl and its resolution by complete surgical excision of the cystic glandular tissue.
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.
Blyweiss, MD recommends increasing your intake of iodine naturally through your diet to fight the toxic effects of radiation and protect your glandular tissues like your thyroid, ovaries, prostate and breasts.
Benign alterations and malignant tumours originating from glandular tissues (e.
Basically, glandular tissue may be subdivided into three phases, namely the epithelial cells (the tumour cells), the lumina, and the stroma, which together account for 100% of the tumour tissue.
The glandular tissues used for investigations were not affected by the underlying disorders.
Chronic inflammation in the nasopharynx induces the formation of oncocytic metaplasia of the glandular tissues in the stroma.
Heinrich (1969) employed aqueous 1% osmium tetroxide alone to fix glandular tissues of Citrus limon, Ruta, and some Poncirus Raf.
Some of the victimized cells may reside in glandular tissues, such as the thymus, where hormones influencing immunity are produced.
Cytokeratins are specific protein markers of cells that are derived from glandular tissues such as breast.