connected to connected to humerus remex feather tertial remex feather Wikipedia:Flight_feather#Tertials tertial remex tertials are connected to the humerus in some species. These elongated "true" tertials act as a protective cover for all or part of the folded primaries and secondaries, and do not qualify as flight feathers as such. However, many authorities use the term tertials to refer to the shorter, more symmetrical innermost secondaries of passerines (which perform the same function as true tertials) in an effort to distinguish them from the other secondaries. A remex feather that is connected to the humerus. true tertial tertiary remex tertiary flight feather tertiary remiges UBERON:0011798 tertial remiges tertial flight feather