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Where does a thread begin?. The visible silk is the endpoint of a process inside the spider. Start at the abdomen, where silk glands store concentrated proteins.

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Protein in a liquid mixture. Silk proteins called spidroins begin in a concentrated liquid. The spider keeps them ready for conversion into a fiber.

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The duct changes conditions. As the mixture passes along the spinning duct, changing acidity and mechanical forces help organize the proteins into silk.

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Tiny outlets guide the silk. Spinnerets carry microscopic outlets called spigots. These connect to glands inside the abdomen and place silk where it is needed.

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Different silks, different jobs. Specialized silk systems support draglines, capture structures, prey wrapping, and egg sacs. Different spider groups have different gland systems.

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Match observation to explanation. Find the silk leaving the photographed spinnerets. Then trace the diagram inward: which parts are visible, and which are explanatory schematics?