Because of the many causes of transient visual disturbance, a structured approach to both the assessment and the management of these patients is essential. The likely causes of transient vision loss (TVL) vary according to the age of the patient.
The mantle cavity is a central feature of molluscan biology. This cavity is formed by the mantle skirt, a double fold of mantle which encloses a water space. This space contains the mollusc's gills, anus, osphradium, nephridiopores, and gonopores. The mantle cavity functions as a respiratory chamber in most molluscs.In bivalves it is usually part of the feeding structure. In some molluscs the mantle cavity is a brood chamber, and in cephalopods and some bivalves such as scallops, it is a locomotory organ.The mantle is highly muscular.he mantle cavity is a central feature of molluscan biology. This cavity is formed by the mantle skirt, a double fold of mantle which encloses a water space. This space contains the mollusc's gills, anus, osphradium, nephridiopores, and gonopores. The mantle cavity functions as a respiratory chamber in most molluscs.
Superficial and deep venous systems of lower limbs. The return of the blood to the heart is the primary function of the venous system. This is achieved. via a pumping mechanism which relies on a unidirectional valvular system. Valve-containing. vessels pass from the deep dermis into the superficial layer of the fat.