There is an FCT structure within the substance of the heart. This structure is known as the fibrous skeleton of the heart. This fibrous skeleton serves two general purposes: (1) as sites of attachment for muscle tissues and (2) as supporting structures for the cardia valves. All of the fibrous structures are continuous and form the fibrous skeleton of the heart.
a. Fibrous Portion of the Interventricular Septum. The uppermost portion (also called the membranous portion) of the interventricular septum is a part of the fibrous skeleton of the heart.
b. Atrioventricular (AV) Rings. Each atrioventricular valve of the heart is surrounded by a dense fibrous ring. This ring maintains the valve opening.
c. Cylinders at Bases of Great Arteries. Each of the semilunar valves of the heart is located within a short fibrous cylinder. This cylinder maintains the structure and function of the valve.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.