1 The posterior pituitary lobe releases two hormones that are produced in the hypothalamus:  Oxytocin, which is responsible for stimulation of milk ejection (milk letdown) and for stimulation of uterine smooth muscle contraction at birth.
Crayfish and crawfish are crustaceans living in freshwater with a great resemblance of the lobsters. However, their size is smaller compared to the lobsters.
See more synonyms on Thesaurus.com. noun, plural (especially collectively) crayfish (especially referring to two or more kinds or species) crayfishes. 1. Also called crawdad, crawdaddy. any freshwater decapod crustacean of the genera Astacus and Cambarus, closely related to but smaller than the lobsters. 2. any of several similar marine crustaceans, especially the spiny lobster.