By Franck Genten
Histology is the self-discipline of biology that comprises the microscopic exam of skinny stained tissue sections as a way to learn their constitution and correlate it with functionality. Histology can become aware of symptoms of illness now not simply well-known on gross exam and will for that reason be of curiosity in fish wellbeing and fitness supervision. the purpose of this quantity is to provide a basic reference advisor offering an intensive set of histological photos of fishes (about forty species). This atlas is designed to be used by means of scholars and researchers, biologists, ichthyologists, fish farmers, veterinarians operating in fisheries and, in fact, by means of comparative histologists who are looking to research extra in regards to the fish international.
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Additional resources for Atlas of Fish Histology
2 1 Fig. 8 RuƟlus ruƟlus (MT / LM) This micrograph shows the wall of the bulbus arteriosus and the ventricle (below). As compared to the laƩer, the wall of the bulbus arteriosus consists of ﬁbroelasƟc Ɵssue (without cardiomyocytes). One can perfectly guess the place (arrow) where the ventricle leads into the bulbus arteriosus through the ventriculo-bulbar valves which cannot actually be seen here. Fig. 9 RuƟlus ruƟlus (MT / MM) In teleosts there is no contracƟle conus, but instead a ﬁbroelasƟc bulbus arteriosus at the base of the ventral aorta.
In teleosts both the median and paired ﬁns are provided with endoskeletal radials and with dermal ﬁn-rays disposed on both sides of the ﬁn: the bony lepidotrichia (circles). These have evolved from scales and each of them is formed by two hemitrichia (arrows) closely joined except at their base. Lepidotrichia can be either soŌ or hard and segmented. Fig. 8 Gnathonemus petersii (MT / MM) Dorsal ﬁn. Each lepidotrichium is composed of two parallel rod-like structures, the hemitrichia, that appear as bowed strips.
The internal elasƟc membrane separaƟng the inƟma from the media is present but hard to observe (undulaƟng aspect). 15 Fig. 13 Scyliorhinus canicula 53 (MT / MM) This micrograph shows a coronary artery within the compact outer layer of the ventricle. The inƟma (1) is very thin and comprises the endothelial lining; the tunica media (2) is composed of smooth muscle cells; the tunica advenƟƟa (3) merges with the surrounding collagenous Ɵssue. In the lumen of the artery various blood cells bath in plasma (pale blue).