Apocryphal definition, of doubtful authorship or authenticity. The eccrine sweat gland, which is controlled by the sympathetic nervous system, regulates body temperature. [27] The sweat only attains its characteristic odor upon being degraded by bacteria, which releases volatile odor molecules. エクリン腺 (Eccrine sweat glands) は全身にあり場所によって密集度が異なる。 ヒトにおいて主に体温を下げるために利用される 。 [14] The gland is large and spongy, located in the subcutaneous fat deep in the dermis,[9][15] and has a larger overall structure and lumen diameter than the eccrine sweat gland. In…, The apocrine sweat glands, associated with the presence of hair in human beings (as on the scalp, the armpit, and the genital region), continuously secrete a concentrated fatty sweat into the gland tube. Apocrine sweat glands, which are usually associated with hair follicles, continuously secrete a fatty sweat into the gland tubule. [31], "Development of the Integumentary System", Miller-Keane Encyclopedia & Dictionary of Medicine, Nursing, and Allied Health, "Genetic Influence on Human Body Odor: From Genes to the Axillae", Diagram of eccrine and apocrine sweat glands, https://en.wikipedia.org/w/index.php?title=Apocrine_sweat_gland&oldid=997744952, Creative Commons Attribution-ShareAlike License, This page was last edited on 2 January 2021, at 01:09. Apocrine sweat glands, which are associated with hair follicles, continuously secrete a fatty sweat into the gland … The characteristic odor of perspiration is produced by the action of bacteria on the material secreted by the apocrine sweat glands. In salivary glands, saliva is produced within the gland, and it secrets into saliva duct and travels to the surface. It appears on the skin surface mixed with sebum, as sebaceous glands open into the same hair follicle. [20], Apocrine sweat glands were originally thought to use only apocrine secretion: vesicles pinch off from the secretory cells, then degrade in the secretory lumen, releasing their product. [10][21][22] Being sensitive to adrenaline, apocrine sweat glands are involved in emotional sweating in humans (induced by anxiety, stress, fear, sexual stimulation, and pain). A special kind of sweat gland called apocrine glands produces scents that convey social information. Apocrine sweat glands refer to a gland, especially a sweat gland that secretes a viscous fluid into a hair follicle whereas eccrine sweat glands refer to a type of simple sweat gland that is found in almost all regions of the skin. 汗腺（かんせん、sweat gland, sudoriferous, sudoriparous glands）は、皮膚にある汗を分泌する腺である。 汗腺には主に次の2種が存在する 。. What your sweat is composed of depends on which gland the sweat is coming out of. In… [9] The apocrine sweat is cloudy, viscous, initially odorless, and at a pH of 6–7.5. [7] In humans, apocrine sweat glands are found only in certain locations of the body: the axillae (armpits), areola and nipples of the breast, ear canal, eyelids, wings of the nostril, perianal region, and some parts of the external genitalia. [18][19], In hoofed animals and marsupials, apocrine glands act as the main thermoregulator, secreting watery sweat. Apocrine glands hold special promise as the source of smells that might affect interpersonal interactions. Apocrine sweat glands involve in the secretion of a chemical fluid known as pheromones that have the ability to attract opposite sex. These glands affect sexual function, odour and sweat secretion. An apocrine sweat gland (/ˈæpəkrən, -ˌkraɪn, -ˌkriːn/; from Greek apo– "away" and krinein "to separate")[5][6] is composed of a coiled secretory portion located at the junction of the dermis and subcutaneous fat, from which a straight portion inserts and secretes into the infundibular portion of the hair follicle. Anal glands are sweat glands that contain a brown, malodorous liquid that is eliminated upon defecation. Apocrine sweat glands are found in mainly in the axillary and pubic regions of the body. The tubules are wrapped in myoepithelial cells, which are more developed than in their eccrine gland counterparts. The canals of these apocrine sweat gland ducts enter the hair follicle superficial to the sebaceous gland, which results in a protein-rich sweat rather than the watery sweat associated with eccrine sweat glands. Stress sweat comes out of the apocrine gland, and smells way different. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Thus, this explains the difference between apocrine and eccrine sweat glands. [8] Horses use them as a thermoregulatory device, as they are regulated by adrenaline and more widely distributed on equines than in other groups. An apocrine sweat gland (/ ˈ æ p ə k r ə n,-ˌ k r aɪ n,-ˌ k r iː n /; from Greek apo– "away" and krinein "to separate") is composed of a coiled secretory portion located at the junction of the dermis and subcutaneous fat, from which a straight portion inserts and secretes into the infundibular portion of the hair follicle. Disclaimer. These are paired glands located on either side of the rectal opening. Sweat gland lesions generally have variable apocrine or eccrine differentiation. Sweat glands. Skin bacteria break…. This is a common phenomenon that takes place in all mammals. [29][30], There is currently no evidence that any sweat glands vary substantially by racial group, with most studies claiming to find variation being subject to methodological flaws. In addition, apocrine metaplasia is also unrelated to apocrine breast carcinoma, which does develop within the apocrine glands of the breast. That leaves the third potential source of a human pheromone—the apocrine gland. [11] Eccrine glands on their paws increase friction and prevent them from slipping when fleeing from danger. [18] Men have more apocrine sweat glands than women in all axillary regions. Sweat gland naevus. They appear after puberty and are more developed in women than in men. [24] More recent research has also shown that merocrine secretion takes place. [21], In a five-month-old human fetus, apocrine glands are distributed all over the body; after a few weeks, they exist in only restricted areas,[9] including the armpits and external genitalia. [9] For most mammals, however, apocrine sweat glands secrete an oily (and eventually smelly) compound that acts as a pheromone,[20] territorial marker, and warning signal. Emotional stress causes the tubule wall to contract, expelling the fatty secretion to the skin, where local bacteria break it down into odorous fatty acids. Apocrine sweat glands, which are usually associated with hair follicles, continuously secrete a fatty sweat into the gland tubule. These chemicals are called pheromones. [23] Unlike eccrine sweat glands, which secrete continuously, the apocrine glands secrete in periodic spurts. [23] More bacteria (especially corynebacteria) leads to stronger odor. HS is a chronic, inflammatory disease affecting sweat glands known as apocrine glands. [20], The "axillary organs", limited regions with equal numbers of apocrine and eccrine sweat glands, only exist in humans, gorillas, and chimpanzees. [15], Non-primate mammals usually have apocrine sweat glands over most of their bodies. [28] Skunks, on the other hand, use the glands to release a secretion that acts as a powerful defense mechanism. Apocrine metaplasia does not, in fact, have anything to do with ‘apocrine glands’. Any of the sweat glands in the axillae and pubic region that open into hair follicles rather than directly onto the surface of the skin as do eccrine sweat glands. Know what is a sweat gland, its classification and functions and the benefits of sweating. The ducts of apocrine sweat glands extend into the follicles of hairs so that the sweat produced by these glands exits the body along the surface of the hair shaft. Emotional stress stimulates contraction of the gland, expelling its contents. However, in some cases, the condition may involve sweat glands of the breasts, scalp, or other areas. See more. …directly onto the skin surface; apocrine glands usually develop in association with hair follicles and open into them. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. apocrine sweat gland. Distribution. [12], The apocrine gland is made up of a glomerulus of secretory tubules and an excretory duct that opens into a hair follicle;[13] on occasion, an excretory duct opens to the skin surface next to the hair. It contains water, protein, carbohydrate waste material, and NaCl. The presence of axillary hair also makes the odor even more pungent, as secretions, debris, keratin, and bacteria accumulate on the hairs. Sweat gland, either of two types of secretory skin glands occurring only in mammals. Apocrine gland anal sac adenocarcinomas (AGASACA) are malignant tumors of the anal glands. Emotional stress causes the tubule wall to contract, expelling the fatty secretion to the skin, where local bacteria break it down into odorous fatty acids. [3] The rest of the body is covered by eccrine sweat glands. In most individuals with HS, recurrent lesions develop in the axillae, groin, vulva, or anal region. [25], Myoepithelial cells form a smooth muscle lining around the secretory cells; when the muscles contract, they squeeze the secretory ducts and push out the accumulated fluid into the hair follicle. Eccrine and apocrine naevi are rare malformations of the glandular component of an eccrine or apocrine gland.The glands within a sweat gland naevus are increased in size and number from birth. [8] They are inactive until stimulated by hormonal changes in puberty. The Sweat Glands are responsible for producing what is known as Sweat or Perspiration which cools down the body and gets rid of any excess salt in the body. Exocrine gland is a gland that secretes chemical substances into ducts. Ring in the new year with a Britannica Membership, https://www.britannica.com/science/apocrine-gland. [8] Modified apocrine glands include the ciliary glands in the eyelids; the ceruminous glands, which produce ear wax; and the mammary glands, which produce milk. Salivary glands, sweat glands, mammary glands, and adrenal gland are some of examples for the exocrine glands. [8] Domestic animals such as dogs and cats have apocrine glands at each hair follicle but eccrine glands only in foot pads and snout. “But when sweat is broken down by bacteria on the skin, it can cause a foul odor.” Essentially, there are two different types of sweat glands on your skin: eccrine and apocrine. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. [20][26] Sweat and sebum are mixed in the hair follicle and arrive mixed at the epidermal surface. As an example, sweat gland and salivary glands. Their apocrine glands, like those in humans, produce an odorless, oily, opaque secretion[10] that gains its characteristic odor upon bacterial decomposition. 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