1 Trabeculae carneae. Muscular cords projecting into the lumen of the heart. A
2 Vortex of heart. Vortex cordis. Whorled arrangement of heart muscle cells at the apex of the heart. B
3 Papillary muscles. Musculi papillares. Cone-shaped muscles projecting into the lumen of the heart. They are connected to the valvular cusps via chordae tendineae and regulate the position of the cusps. A D
4 Chordae tendineae. Tendinous filaments between the papillary muscles and the atri-oventricular valve. A D
5 Right/left fibrous trigone. Trigonum fibrosum dextrum/sinistrum. Connective tissue wedge between the aorta and the atrioventricular opening anteriorly and posteriorly. C
6 Right/left fibrous ring. Anulus fibrosus dexter/ sinister. Fibrous rings between the atria and ventricles that give attachment to the atri-oventricular valves. C
6a Tendon of infundibulum. Tendo infundibuli. Vestige of the embryonic spiral septum. C; see also page 185 D
7 Myocardium. Transversely striated heart muscle fibers with intercalated discs including the impulse-conducting system. A D
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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.