Josef Hyrtl

“ I trust, that those engaged in optical inquiries, will see the importance of this discovery, for the assertion of physicists, that the blood-vessels of the retina must absorb some of the rays of light, and so cause certain imperfections in the vision of minute objects, cannot hold as true for all eyes, now that the existence of bloodless retinas is an established fact. ”

“ It happens very often, that the occipital artery seems to send a branch through the mastoid foramen; it is very commonly believed that this branch appertains to the dura mater, and is an accessory nutritive artery (Art. meningea externa accessoria) . Now, when a series of isolated injections of the occipital artery are made, it is easy to show that, in many instances, the artery which passes into the mastoid foramen does not pass through it, and that it is, therefore, no meningeal artery. ”

“ When an organ receives several arteries, then the isolated injection of each with differently coloured injections, will show, in a most satisfactory manner, what portion of the organ is supplied by each branch. ”

“ The superior laryngeal artery is not exposed to muscular compression, but the inferior thyroid, which gives a branch to the larynx, may occasionally be compressed by vehement contraction of the muscles under which it wends its way. The intra-laryugeal anastomosis of both is so arranged, that the necessary supply of blood cannot be stopped by such compression. ”

“ When a vertical section of this ligament is made, no arterial vessel can be singled out, passing from the ligament to the bony substance of the head of the femur; but if you inject the perforating artery, of which the nutritive artery of the femur is a branch, you will obtain a very satisfactory microscopical injection of the interior of the bone ”

“ An isolated injection of the middle meningeal artery makes it evident, that this artery is not only destined to be the nutritive artery of the cranium, but also, that very numerous off-sets of the diplöetic branches pass out to the external surface of the calvarium and ramify freely throughout the pericranium. ”

“ In the uteri of children, of which I have several well injected preparations, the right and left arteries appear to he as independent as those of the heart. An injection of the arteries of one side is always followed by the perfect filling of the vessels of that side, and the absence of injection in the other. ”

“ The cartilaginous combs, or fringes, attached to the concave borders of the branchial arches, are set in two rows on each arch; these two rows are likewise divergent, so that the tips of the fringes of the outside row of one arch, meet the tips of the fringes of the inside row of the next one. The tips of each pair of fringes firmly coalesce and cannot be separated without breaking them. ”

“ An organ like the labyrinth of this fish, with such important functions to perforin, could not well be lodged in the trunk, where it would be in the way of powerfully acting muscles, but it is quite securely situated, under the rib-like protection of this kind of thorax, formed by the five pairs of accessory ribs. ”

“ This is the case, too, with all the osseous Fishes, while the more highly organised Rays and Sharks have, like warm-blooded animals, the coronary arteries distributed to the whole muscular coat of their hearts. ”

“ III. 1850) . [3] I made the first injection of the Hyaloidea of Coluber and Rana in the year 1831. The preparations are now in the Anatom. Museum of our University, and duplicates were sent in 1832 to Prof. Retzius in Stockholm, and 1837, to Prof. T. Müller in Berlin. ↑ In a note to me, Prof. Hyrtl adds, that in all the Saurians and Chelonians there is no vascular hyaloidea, and that even among the amphibia, the Sozura— (Salamander, Triton, Amphuima, &c.) have a bloodless hyaloid. ”