What are the yellowish organs with a granular texture that fill most of the cephalothorax?

The yellowish organs with a granular texture that fill most of the cephalothorax are likely the digestive glands, also known as hepatopancreas, found in certain arthropods like crustaceans and some arachnids. These glands play a crucial role in digestion and nutrient absorption, as they secrete enzymes that help break down food. Their granular texture is due to the presence of secretory cells and storage vacuoles, which facilitate their digestive functions.