GENERAL HISTOLOGY

Detailed explanation-1: -Some animals are known for their ability to regrow – or regenerate – body parts following dramatic injury. Starfish are among the most famous and dramatic examples, being able to grow an entire new body from just a single arm. Starfish also have the ability to regenerate neurons, something not seen in many animals.

Detailed explanation-2: -In sea stars and sea urchins, morphallaxis is the main regenerative process, involving cells derived from existing tissues by differentiation, transdifferentiation or migration2, 3.

Detailed explanation-3: -In arm autotomy, starfish typically shed arms with part of the central disk attached. This arm regenerates into a full starfish identical to the original through disk-dependent bidirectional regeneration.

Detailed explanation-4: -So long as one fifth of the central disk and at least one arm remains, the sea star can completely recover. Regeneration can take up to a year.