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The epidermis
The body wall of a cnidarian consists of three layers, an outer layer known as the epidermis, a middle layer called the mesoglea, and an inner layer referred to as the gastrodermis.
The body wall of a cnidarian consists of three layers, an outer layer known as the epidermis, a middle layer called the mesoglea, and an inner layer referred to as the gastrodermis.
the epidermis is the outer layer it is a tissue
That is called tissue.
tunica adventitia
connectiveThe outer layer of a blood vessel (artery or vein) is called the tunica externa or tunica adventitia.See http://training.seer.cancer.gov/module_anatomy/unit7_3_cardvasc_blood1_classification.htmlpericardium is the layer of the blood vessel that is made of tough connective tissue.
The outer layer is called the tunica externa (or tunica adventitia) and is composed mostly of connective tissue
Connective Tissue
Epicardium is the outer layer of heart tissue. When considered as part of the pericardium, it is the inner layer, continuous with the serial layer.
Venules are small blood vessels with three basic layers. These layers are an inner membrane called an endothelium, a middle layer of muscle tissue, and the outer layer, which is made of fibrous connective tissue.
Xylem