How do crustaceans grow in the rigid cuticle in the period between a molting and next one?

Do they loosen joints for growing or have spaces inside the cuticle?How do crustaceans grow in the rigid cuticle in the period between a molting and next one?
Once formed, the arthropod cuticle does not grow, unlike the shells of molluscs and tortoises. Therefore, before an arthropod can grow, the old cuticle has to be shed and replaced by a larger one, a process known as moulting. During the moulting cycle, a new soft and high folded cuticle is deposited below the old cuticle. The arthropod then inflates its body with either water or air, causing the old cuticle to split along pre-formed lines of weakness and the old cuticle is usually cast off in one piece. Another inflation of the body expands the new cuticle before it hardens.








Another handicap of a rigid cuticle is the problem of insensitivity. This is overcome by the possession of bristles at the appropriate parts of the body. Most of these bristles are sensitive to bending (mechanoreceptors), though some act as chemoreceptors.