THE GLANDULAR SYSTEM 249 



THE SUDORIPAROUS GLANDS 



The sudoriparous glands excrete the sweat. They 

 consist of minute openings, commonly called the pores 

 of the skin. Their function is to extract from the blood 

 the excrementitious material (this function has been 

 described in a previous chapter). It is estimated that 

 the daily excretion from these glands amounts to about 

 2 pounds, although it varies according to the nature of 

 the food and drink taken, the amount of exercise, external 

 temperature, season, etc. 



FlG. 130. Sweat-glands of different size (of moderate magnification), 

 showing coil or convolutions forming gland proper, the blind end of tubule, 

 and excretory duct (Sappey). 



The secretion of sweat is regulated by the nervous sys- 

 tem. Here, as in the secreting glands, the fluid is formed 

 from material in the lymph-spaces surrounding the 

 glands. Two sets of nerves are concerned: Vasomotor, 

 regulating the blood-supply; and secretory, stimulating 

 the activities of the gland-cells. Generally, the two 

 conditions, increased blood-flow and increased glandular 

 action, coexist. At times a profuse, clammy perspiration 

 occurs with a diminished blood-flow. 



