silk gland middle silk gland 2017-09-26T18:56:51Z BTO:0006117 BrendaTissueOBO Marion, contact@brenda-enzymes.org The silk gland contains three compartments according its morphology and function, including the anterior silk gland, middle silk gland, and posterior silk gland. The fibroins and sericins are synthesized in the posterior and middle silk gland, respectively and then stored in the lumen of the silk gland as a concentrated aqueous silk solution.