start stage end stage caudal fin musculature deep caudal fin musculature zebrafish_anatomy The layer of caudal fin musculature immediately under the superficial caudal fin musculature that originate from the vertebral column and insert at the base of caudal fin rays. The three most caudal vertebrae and the hypurals serve as attachment sites for these muscles. ZFA:0005819 Ceri 2014-10-29T04:16:13Z unknown adult