gill-arch

Von Baer also confirmed Rathke's discovery of the operculum, assigning it, however, to the second gill-arch.

Form and Function A Contribution to the History of Animal Morphology

Huschke was indeed the first to suggest that both upper and lower jaws were formed in the first gill-arch.

Form and Function A Contribution to the History of Animal Morphology

There were generally present, he found, four gill-slits, and, as Rathke had suggested, the first gill-arch became the lower jaw.

Form and Function A Contribution to the History of Animal Morphology

The first gill-arch itself develops a cartilage at one of its inner sides, the

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

From the first gill-arch, from the inner surface of which the muscular tongue proceeds, we get the first structure of the maxillary skeleton -- the upper and lower jaws, which surround the mouth and support the teeth.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

The first pair of aorta-arches rise on the inner wall of the first pair of gill-arches, and so lie between the first gill-arch (k) and the fore-gut (d), just as we find them throughout life in the fishes.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

Human foetus of twenty to twenty-two days, taken from the preceding ovum, magnified. a amnion, b yelk-sac, c lower-jaw process of the first gill-arch, d upper-jaw process of same, e second gill-arch (two smaller ones behind).

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

The following characteristics of the Gnathostomes are anatomic features of this kind: (1) The internal gill-arch apparatus with the jaw arches; (2) the pair of nostrils; (3) the floating bladder or lungs; and (4) the two pairs of limbs.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

Head of a chick embryo, four days old, from below. n nasal pit, o upper-jaw process of the first gill-arch, u lower-jaw process of same, k double apostrophe second gill-arch, sp choroid fissure of eye, s gullet.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

Above at the basis a small process grows out of this first gill-arch; this is the upper-jaw process.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876