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Sweat Gland - its Anatomy & DevelopmentSweat gland anatomy and structures In terms of structure sweat glands can be divided into three distinct regions: 1) the coiled secretory portion (or 'cul-de-sac' portion) that lies in the deeper layer of the skin or dermis, 2) the duct or hollow tube that passes through the dermis and to the outermost layer of the skin called the epidermis and, 3) the final portion of the duct which spirals its way through the epidermis giving rise to the surface pore, also called the acrosyringium (pronounced: a-cro-sur-in-gee-um). Sweat gland functions Each one of these portions or segments of the sweat gland have a specific function: 1) as its name implies, the secretory segment is responsible for the production of sweat - without the hard work of these little sweat gland components, we would all be in serious trouble: our bodies would heat up (hyperthermia) and damage to our vital organs would result. 2) during its passage through ductal portion of the gland, sweat is desalinated by cells that line the duct. In other words, salty elements such as sodium and chloride are reabsorbed to render a significantly less salty or hypotonic solution 3) the acrosyringium is the least active part of the sweat gland - it serves as a conduit for perspiration's final journey to the surface of the skin.
For more on sweat, view the video below
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How sweat glands evolve and develop
Approximately 3 million eccrine sweat units are present at birth, and no additional ones are formed thereafter. It is during the fourth week of embryologic development (the embryo measures about 1.25 cm or 0.5 inch at this point), that certain cell types (ectoderm and mesoderm) begin to multiply and differentiate into noticeable and specific structures. The specialized structures formed by the skin, including teeth, hair, hair follicles, fingernails, toenails, sebaceous glands, sweat glands, apocrine glands, and mammary glands begin to appear during this period in development. Eccrine sweat glands first appear on palms and soles during the 12th week of development. Sweat glands actually develop by budding their way as downgrowths from the epidermis (see below). By the sixth month of intrauterine life, when secretion of sweat begins, the sweat glands look very much like mature glands consisting of the three structural components discussed above. No new sweat glands are formed after birth.
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