Epithelium is a tissue existing in a multiplicity of forms which are specialized to carry out one or more characteristic tasks. The unique function of epithelia lies in providing a boundary . . . [that] line inner surfaces and cover outer surface . . . In some organs, such as skin, the epithelium serves as a protective barrier, but the additional activities in which most epithelia engage are in some instances their primary role. Characteristic functions include transport, absorption, and secretion.
Brain
- The chordate brain is divided into three main parts: the prosencephalon (forebrain) mesecephalon (midbrain) and rhombencephalon (hindbrain)
- Each of these three parts of the brain in primitive associated with the three main senses, olfaction (forebrain) vision (midbrain) and the acustive lateralis system (hindbrain)
Testis Histology
Video about histology of testes including spermatogonia, spermatocyte, spermatid
. Basic histology of testes.
Histology Application
This is the very good application for science and medicine faculty students Lot of images and the quality of the sharp images with excellent resolution and short description about image available. Free application vers. has limited views and need an internet connection to view them.
Muscle Vasculature
Capillaries found in endomysium and larger arteries and veins in skeletal muscle in through the perimysium. Blood vessels flow through, and only through, connective tissue. This is the perimysium between two groups of skeletal muscle fibers. 
pathguy.com
circulatory system
The function of circulatory system : transport of respiratory gases, hormone distrubition, heat distrubution, immune defence. Circulatory system has three essential components; a circulating fluid, a vascular system and heart. Lower metazoans lack a body cavity and do not have an internal circulatory system. Coelentrate do not have also an internal circulatory system because their body wall is very thin.
The body cavity of higher pseudocoelomate and coelomate animals contains a coelomic fluid. Some of the coelomate animalssuch as crustaceans, the vascular system is mesodermal tube that partially seperates thee blood from hemocoel.
A heart may be present to propel hemolymph through the vessels. In other some coelomate animals, the ceolom completely seperated from coelom. The closed circulatory system have a complete system of vessels and the blood is completely seperate and has a ddifferent composition from the interstitial fluid.
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