Lepus, the truncus arteriosus and the sinus venosus, into the latter of which the venous blood runs before entering the right auricle, are to be noted.
The truncus arteriosus may then be followed up as it branches.
With the reduction of the conus the bulbus arteriosus is enlarged.
The conus arteriosus too begins to be divided into two chambers, and in Protopterus this division is complete.
The valves between the ventricles and auricles are now well developed, and it is about this time that the division of the truncus arteriosus into the aorta and pulmonary artery becomes visible from the exterior.
Its course downwards is not straight but spiral, and thus the two channels into which it divides the truncus arteriosus wind spirally the one round the other.
The truncus arteriosus is moreover only divided into two parts, one of which is continuous with all the systemic arteries.
The truncus arteriosus lies to the left, and is continued into the ventricle which lies ventrally and more to the right, and this again into the dorsally placed auricular section.
It is also provided with a longitudinal septum, which is no doubt homologous with the septum in the conus arteriosus of the Dipnoi.
The sinus venosus in Mammals becomes completely merged into the right auricle, and the systemic division of the truncus arteriosusis apparently not homologous with that in Birds.
At the time when the septum is first formed, the opening of the truncus arteriosus into the ventricles is narrow or slit-like, apparently in order to prevent the flow of the blood back into the heart.
A and B), but with the division of the truncus arteriosus into three vessels one of these, i.
Along its diverging limbs are seen the conspicuous venous roots of the vitelline veins, uniting to form the heart h, already established by the coalescence of two lateral halves which, continuing forward as the bulbus arteriosus b.
Of these the main parts of the first two, connecting the truncus arteriosus with the collecting trunk into which the arterial arches fall, always disappear, usually before the complete development of the arteries in the posterior arches.
About the 106th hour, a septum begins to make its appearance in the truncus arteriosus in the form of a longitudinal fold, which according to Tonge (No.
In some cases the insertion of the ductus arteriosus is lower down, so that no such mixture occurs.
The place where the ductus arteriosus pours the impure blood into the aorta, is almost immediately opposite to where the artery is given off which feeds the left arm.
The ductus arteriosus closes up about the same time as the foramen ovale.
The left pneumo-gastric nerve winds round beneath the arch at the point where the obliterated ductus arteriosus joins it.
The ductus arteriosus may remain pervious, and while co-existing with the proper aortic arch, two arches would then appear on the left side.
Ductus arteriosus in the loop of left vagus nerve, and close to phrenic nerve of left side.
After birth, on the commencement of respiration, the foramen ovale of the interauricular septum closes, and the ductusarteriosus becomes impervious.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "arteriosus" in a variety of sentences. We hope that you will now be able to make sentences using this word.
