In the second of these embryos the part of the segmental duct anterior to the front end of the Wolffian duct, which is converted directly into the oviduct, extended through 48 sections.
In my youngest example, in which the splitting had commenced, there were two separate ducts for only 14 sections, and in a slightly older one for about 18.
Immediately in front of it is placed the optic chiasma (Plate 38, figs.
In front of the infundibulum is the opticchiasma (Plate 37, fig.
It is urged that in closely related species of lizards some have the optic chiasma and others do not.
The chiasma of the optic nerves is so common to all the known Ganoids, and has not been found in those forms (e.
In the living forms the air-bladder is connected with the œsophagus through life; optic chiasma present; intestine with a spiral valve.
Operative treatment has been successful in a number of cases, but as the anterior lobe is essential to life, the operation is merely directed towards the relief of pressure on the optic chiasma with a view to preventing loss of vision.
Among these are the mailed head and body, the heterocercal tail, the cellular air-bladder, the presence of valves in the arterial bulb, the presence of a spiral valve in the intestine and of a chiasma in the optic nerves.
In the sharks, rays, chimaeras, and Ganoids the two optic nerves are joined in a chiasma as in the higher vertebrates.
The Optic Chiasmaof Teleosts: A Study of Inheritance.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "chiasma" in a variety of sentences. We hope that you will now be able to make sentences using this word.
