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[8] Horses use them as a thermoregulatory device, as they are regulated by adrenaline and more widely distributed on equines than in other groups. The presence of axillary hair also makes the odor even more pungent, as secretions, debris, keratin, and bacteria accumulate on the hairs. 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 。 By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. [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. [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. Ring in the new year with a Britannica Membership, https://www.britannica.com/science/apocrine-gland. [16][8] The secretory tubules of apocrine glands are single layered, but unlike the eccrine secretory tubules, contain only a single type of ductal epithelial cell,[17] varying in diameter according to their location, and sometimes branching off into multiple ducts. [15], Non-primate mammals usually have apocrine sweat glands over most of their bodies. Exocrine gland is a gland that secretes chemical substances into ducts. These are paired glands located on either side of the rectal opening. [24] More recent research has also shown that merocrine secretion takes place. 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. 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. [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. Apocrine sweat glands involve in the secretion of a chemical fluid known as pheromones that have the ability to attract opposite sex. 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. The eccrine sweat gland, which is controlled by the sympathetic nervous system, regulates body temperature. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. The characteristic odor of perspiration is produced by the action of bacteria on the material secreted by the apocrine sweat glands. [23] More bacteria (especially corynebacteria) leads to stronger odor. Emotional stress stimulates contraction of the gland, expelling its contents. Distribution. As an example, sweat gland and salivary glands. The tubules are wrapped in myoepithelial cells, which are more developed than in their eccrine gland counterparts. 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. “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. 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. [9], Most non-primate mammals, however, have apocrine sweat glands over the greater part of their body. Apocrine sweat glands are found in mainly in the axillary and pubic regions of the body. A special kind of sweat gland called apocrine glands produces scents that convey social information. 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. However, in some cases, the condition may involve sweat glands of the breasts, scalp, or other areas. What your sweat is composed of depends on which gland the sweat is coming out of. Skin bacteria break…. [3] The rest of the body is covered by eccrine sweat glands. These chemicals are called pheromones. [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). In… Anal glands are sweat glands that contain a brown, malodorous liquid that is eliminated upon defecation. Apocrine sweat glands, which are usually associated with hair follicles, continuously secrete a fatty sweat into the gland tubule. 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. They appear after puberty and are more developed in women than in men. Their apocrine glands, like those in humans, produce an odorless, oily, opaque secretion[10] that gains its characteristic odor upon bacterial decomposition. Apocrine metaplasia does not, in fact, have anything to do with ‘apocrine glands’. In addition, apocrine metaplasia is also unrelated to apocrine breast carcinoma, which does develop within the apocrine glands of the breast. apocrine sweat gland. Sweat gland naevus. [18][19], In hoofed animals and marsupials, apocrine glands act as the main thermoregulator, secreting watery sweat. HS is a chronic, inflammatory disease affecting sweat glands known as apocrine glands. 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. [9] The apocrine sweat is cloudy, viscous, initially odorless, and at a pH of 6–7.5. 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. In most individuals with HS, recurrent lesions develop in the axillae, groin, vulva, or anal region. Sweat gland lesions generally have variable apocrine or eccrine differentiation. [27] The sweat only attains its characteristic odor upon being degraded by bacteria, which releases volatile odor molecules. Apocrine sweat glands, which are usually associated with hair follicles, continuously secrete a fatty sweat into the gland tubule. Stress sweat comes out of the apocrine gland, and smells way different. [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. [11] Eccrine glands on their paws increase friction and prevent them from slipping when fleeing from danger. [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. [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. Thus, this explains the difference between apocrine and eccrine sweat 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. That leaves the third potential source of a human pheromone—the apocrine gland. [20][26] Sweat and sebum are mixed in the hair follicle and arrive mixed at the epidermal surface. Know what is a sweat gland, its classification and functions and the benefits of sweating. Disclaimer. It contains water, protein, carbohydrate waste material, and NaCl. Sweat glands. Apocrine gland anal sac adenocarcinomas (AGASACA) are malignant tumors of the anal glands. [28] Skunks, on the other hand, use the glands to release a secretion that acts as a powerful defense mechanism. This is a common phenomenon that takes place in all mammals. [20], The "axillary organs", limited regions with equal numbers of apocrine and eccrine sweat glands, only exist in humans, gorillas, and chimpanzees. Sweat gland, either of two types of secretory skin glands occurring only in mammals. [9] In humans, the apocrine glands in this region are the most developed (with the most complex glomeruli). See more. Apocryphal definition, of doubtful authorship or authenticity. Its characteristic odor of perspiration is produced within the gland … sweat gland lesions generally have variable apocrine or differentiation. With ‘ apocrine glands of which there are two types: eccrine and apocrine [ 23 ] more recent has! Are associated with hair follicles, continuously secrete a fatty sweat into the gland tubule metaplasia is also what is an apocrine sweat gland apocrine! Have anything to do with ‘ apocrine glands ’, inflammatory disease affecting sweat over. 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