The Wonders of Webs I – Spider Silk
Spiders carry a gel called “unspun silk dope” in their silk glands, and when the liquid is released, it travels through projections called spinnerets located on the underside of the abdomen’s tip and becomes solid when it hits the air. Spinnerets are the external extension of the silk glands; most spiders have between two and eight spinnerets, tipped by “spigots” that control the diameter of the emerging thread.