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Eccrine sweat gland

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Title: Eccrine sweat gland  
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Subject: Apocrine sweat gland, Sweat gland, Trichoepithelioma, Integumentary system, Syringoma
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Eccrine sweat gland

Eccrine sweat gland
A sectional view of the skin (magnified), with eccrine glands highlighted.
Details
Latin Glandula sudorifera merocrina;
Glandula sudorifera eccrina
Precursor Ectoderm[1]
System Integumentary[1]
Cholinergic sympathetic nerves[2]
Identifiers
MeSH A10.336.899.480
Anatomical terminology

Eccrine glands (, , or ; from ekkrinein "secrete";[3] sometimes called merocrine glands) are the major sweat glands of the human body, found in virtually all skin, with the highest density in palms and soles,than on the head,but much less on the trunk and the extremities.In lower mammals they are relatively sparse being found mainly on hairless areas such as foot pads. They reach their peak of development in man where they may be 200-400/sq. cm of skin surface.[4][5] They produce a clear, odorless substance, consisting primarily of water and NaCl. NaCl is reabsorbed in the duct to reduce salt loss,[6] but is dysfunctional in cystic fibrosis thus producing salty sweat. They are active in thermoregulation by providing cooling from water evaporation of sweat secreted by the glands on the body surface and emotional induced sweating (anxiety, fear, stress, and pain).[5][7] The white sediment in otherwise colorless eccrine secretions is caused by evaporation that increases the concentration of salts.

The odour from sweat is due to bacterial activity on the secretions of the apocrine sweat glands, a distinctly different type of sweat gland found in human skin.

Eccrine glands are composed of an intraepidermal spiral duct, the "acrosyringium"; a dermal duct, comprising a straight and coiled portion; and a secretory tubule, coiled deep in the dermis or hypodermis.[7] The eccrine gland opens out through the sweat pore. The coiled portion is formed by single layer of columnar or cuboidal epithelial cells, which are secretory in nature. The epithelial cells are interposed by the myoepithelial cells. Myoepithelial cells support the secretory epithelial cells. The duct of eccrine gland is formed by two layers of cuboidal epithelial cells. Eccrine glands are innervated by the sympathetic nervous system, primarily by cholinergic fibers whose discharge is altered primarily by changes in deep body temperature(core temperature), but by adrenergic fibers as well.[8] The glands on palms and soles do not respond to temperature but secrete at times of emotional stress.

Secretion

Eccrine glands function throughout life since birth. The secretion of eccrine glands is a sterile, dilute electrolyte solution with primary components of bicarbonate, potassium, and sodium chloride (NaCl).[5] There are other components secreted such as glucose, pyruvate, lactate, cytokines, immunoglobulins, antimicrobial peptides (e.g. dermcidin), and many others.[5] Dermcidin is a newly isolated antimicrobial peptide produced by the eccrine sweat glands.[9]

References

  1. ^ a b Neas, John F. "Development of the Integumentary System". In Martini, Frederic H.; Timmons, Michael J.; Tallitsch, Bob. Embryology Atlas (4th ed.). Benjamin Cumings. Retrieved 17 December 2012. 
  2. ^ Krstic, Radivoj V. (18 March 2004). Human Microscopic Anatomy: An Atlas for Students of Medicine and Biology. Springer. p. 464.  
  3. ^ "eccrine". The New Oxford American Dictionary (2 ed.). 2005.  
  4. ^ James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology (10th ed.). Saunders. pp. 6–7.  
  5. ^ a b c d Bolognia, J., Jorizzo, J., & Schaffer, J. (2012). Dermatology (3rd ed., pp. 539-544). [Philadelphia]: Elsevier Saunders.
  6. ^ Mauro, Theodora M; Goldsmith, Lowell A. "Biology of Eccrine, Apocrine, and Apoeccrine Sweat Glands". In Wolff, K; Goldsmith, LA; Katz, SI; Gilchrest, B; Paller, AS; Leffell, DJ. Fitzpatrick's Dermatology in General Medicine. 
  7. ^ a b Wilke, K.; Martin, A.; Terstegen, L.; Biel, S. S. (June 2007). "A short history of sweat gland biology" (pdf). International journal of cosmetic science 29 (3): 169–179.  
  8. ^ Sokolov, VE; Shabadash, SA; Zelikina, TI (1980). "Innervation of eccrine sweat glands". Biology Bulletin of the Academy of Sciences of the USSR 7 (5): 331–46.  
  9. ^ Niyonsaba, F; Suzuki, A; Ushio, H; Nagaoka, I; Ogawa, H; Okumura, K (2009). "The human antimicrobial peptide dermcidin activates normal human keratinocytes". The British journal of dermatology 160 (2): 243–9.  

External links

  • American Academy of Dermatology – Eccrine and Apocrine Glands
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