The coelom of birds (pigeon) is well developed and divided into two cavities, anterior thoracic and posterior abdominal cavities, by a membranous oblique septum or diaphragm. The thoracic cavity has two dorso-lateral pleural cavities, each enclosing a lung. The two pleural cavities are separated from each other by the antero-ventral pericardial cavity enclosing the heart lying in the middle between [...]
The pigeon, like other vertebrates, has receptors or sense organs for touch, smell, taste, sight and hearing which are stimulated by the environment. These sense organs are termed external receptors or exteroceptors. The pigeon possesses following exteroceptors: 1. Tactile Organs: These are poorly developed in birds due to feathery covering of the body. Tactile organs of pigeon remain confined to [...]
In this article we will discuss about the anatomy of lamprey with the help of suitable diagrams. Body Wall: The skin is soft, slimy and consists of many layers of cells. The epidermis is composed mostly of unicellular gland cells that produce slimy secretion and its outermost cells border show cuticular striations. The dermis is composed of bundles of collagenous [...]