Tunica media layer of large (aorta)
The tunica interna is the innermost lining of the blood vessel. It is lined by endothelium, which is almost always simple squamous epithelium, and its underlying connective tissue. In arteries a layer of elastic tissue called the internal elastic membrane marks the outer boundary of the tunica interna. 2. Arteries sometimes have an outer layer of elastic tissue called the external elastic membrane. When present this marks the boundary between the tunica media and tunica externa. 3. Tunica externa a.k.a. tunica adventitia. The tunica externa is the connective tissue that forms the outermost layer of the vessel. In vessels larger than 1 mm in diameter a subendothelial layer of loose connective tissue (a basement membrane) supports the endothelium---- ---The tunica media is the middle layer and consists circularly arranged smooth muscle cells and sheets of elastin. a) Three distinct layers or tunics form the walls of blood vessels: ---The tunica interna (tunica intima) is the innermost layer. It contains the endothelium which is a continuation of the endocardial lining of the heart. Describe the tunica externa. Its the outer tissue layer that forms a connective tissue sheath around the vessel, is primarily composed of collagen fibers with scattered elastic fibers and the fibers blend into adjacent tissue anchoring the blood vessel to body tissue.   . Smooth muscle is found within the walls of blood vessels (such smooth muscle specifically being termed vascular smooth muscle) such as in the tunica media layer of large (aorta) and small arteries, arterioles and veins. It is divided into two subgroups; the single-unit (unitary) and multiunit smooth muscle. Within single-unit cells, the whole bundle or sheet contracts as a syncytium (i.e. a multinucleate mass of cytoplasm that is not separated into cells). Structure of Blood Vessels a) Three distinct layers or tunics form the walls of blood vessels: ---The tunica interna (tunica intima) is the innermost layer. It contains the endothelium which is a continuation of the endocardial lining of the heart. The tunica media is the middle layer of the wall of a blood vessel. It is made up of smooth muscle cells and sheets of elastic tissue that help regulate blood flow in the body … by causing the blood vessel to narrow or widen. Confidence votes 2. The three layers of the arterial wall are, from outside to inside, the adventia, the media and the intima. A flat layer of cells, called endothelial cells, forms a boundary between the blood in the lumen, or cavity, and the innermost layer of the arterial wall. Its called tunica intima The tunica media is the middle layer in a blood vessel wall and is composed predominantly of smooth muscle reinforced by organised layers of elastic tissue which form elastic laminae. Confidence votes 2. The three layers of the arterial wall are, from outside to inside, the adventia, the media and the intima. A flat layer of cells, called endothelial cells, forms a boundary between the blood in the lumen, or cavity, and the innermost layer of the arterial wall. Blood (400X). Blood is a connective tissue with a fluid matrix called plasma. Three basic types of cells are found suspended in plasma: The Erythrocytes (red blood cells) are pink with a light center (where the cell is thinner and the light shines through). Skeletal muscle is a form of striated muscle tissue which is under the voluntary control of the somatic nervous system. It is one of three major muscle types, the others being cardiac muscle and smooth muscle. Skeletal muscle is made up of individual muscle cells or myocytes, known as muscle fibers. They are formed from the fusion of developmental myoblasts (a type of embryonic progenitor cell that gives rise to a muscle cell) in a process known as myogenesis. Muscle fibres are cylindrical, and multinucleated.
http://droualb.faculty.mjc.edu/Lecture%20Notes/Unit%204/cardiovascular-blood%20vessels%20with%20figures.htm http://www.angelfire.com/sc3/mrboyce/syllabusbio_141.htm https://quizlet.com/3419788/ch-22-review-flash-cards/ https://en.wikipedia.org/wiki/Smooth_muscle http://www.angelfire.com/sc3/mrboyce/syllabusbio_141.htm http://www.answers.com/Q/What_is_the_middle_muscle_layer_in_a_blood_vessel_called http://www.answers.com/Q/What_is_the_middle_muscle_layer_in_a_blood_vessel_called http://web.clark.edu/rrausch/biolabs/histo/connective/ct_index.html https://en.wikipedia.org/wiki/Connective_tissue_in_skeletal_muscle
What is the name of the blood vessel layer that contains smooth muscle fibers?