In some nymphs/naiads the most anterior pair has become sclerotized and works as a gill cover for the rest of the gills.
The most anterior parts of a fish's brain are the olfactory bulbs.
The two most anterior pharyngeal arches are thought to have become the jaw itself and the hyoid arch, respectively.
Labial cartilages are found in the most anterior part of the mouth.
The pectineus muscle is the most anterior adductor of the hip.
Nasal Vestibule is the most anterior part of the nasal cavity.
The excimer laser is used to ablate the most anterior portion of the corneal stroma.
The immature stage is the most anterior proglottid, and consists of anywhere between 200 to 300 proglottids.
The most anterior of the trapezius muscles, it is also the largest.
The furrows of the 5 most anterior segments are deep laterally, but very shallow in the middle third.
