part of start stage end stage anal erector anal erectors ZFA:0000617 TAO:0000617 Series of muscles that have a distal attachment at the anteriolateral base of each ray and spike and a proximal attachment to the haemal spines. A tendon runs along one third the dorsoventral length of the muscle toward the attachment at the haemal spine. These muscles act in opposition to the anal depressors to raise the anal fin rays. zebrafish_anatomy erectores anales anal fin musculature erector muscle unknown adult