where does the ink sac of a squid empty into
Ink sac The ink sac is a muscular bag which originated as an extension of the hind gut; it is a modified hypobranchial gland.[2] It lies beneath the gut and opens into the anus, into which its contents – almost pure melanin – can be squirted; its proximity to the base of the funnel means that the ink can be distributed by ejected water as the cephalopod uses its jet propulsion.[1] The ejected cloud of melanin is bound by mucus particles, so it forms a lump approximately the size and shape of the cephalopod, fixing the predator's attention while the mollusc itself makes a hasty escape.[1]