On the three bones forming the first gill-arch are attached numerous appendages called gill-rakers .
Note the gill-rakers, short and blunt, on the first gill-arch.
Von Baer also confirmed Rathke's discovery of the operculum, assigning it, however, to the second gill-arch.
Huschke was indeed the first to suggest that both upper and lower jaws were formed in the first gill-arch.
gill arch n.
See branchial arch.