. Anatomy in a nutshell : a treatise on human anatomy in its relation to osteopathy. Human anatomy; Osteopathic medicine; Osteopathic Medicine; Anatomy. ANATOMY IN A NUTSHELL. 239 to the heart. The tenth and sympathetic go to the lungs substance, while the phrenic and sympatheic pass to the pleura. LESSON LXV. The heart (Plate CXXVIII.) is situated in the middle mediastinum be- tween the spinous processes of the fourth dorsal and eighth dorsal vertebra posteriorly. Its apex is directed downward and forward to the left, and lies against the fifth intercostal space three-quarters of an inch to t
. Anatomy in a nutshell : a treatise on human anatomy in its relation to osteopathy. Human anatomy; Osteopathic medicine; Osteopathic Medicine; Anatomy. ANATOMY IN A NUTSHELL. 239 to the heart. The tenth and sympathetic go to the lungs substance, while the phrenic and sympatheic pass to the pleura. LESSON LXV. The heart (Plate CXXVIII.) is situated in the middle mediastinum be- tween the spinous processes of the fourth dorsal and eighth dorsal vertebra posteriorly. Its apex is directed downward and forward to the left, and lies against the fifth intercostal space three-quarters of an inch to the inn< r sid of PLATE XCVI. ROUGH SURFACE FOR CHECK LJGAMEW. SUP. ARTIC. PROC. ODONTOID PROC. ARTIC. GROOVE FOR TRANSVERSE LAMI SPINOUS PROC Posterior View of Axis. the left nipple and an inch and a half below the same. The heart lies obliquely behind the lower tw< -thirds of the sternum, extending about three inches to the left of the median line and one and a half inches to the right. Its anterior surface consists mostly of the light ventricle and a part of the left ventricle. It is convex and looks upward and forward. Its posterior surface consists mostly of the left ventricle and rests upon the Diaphragm. This surface is flattened. The right border of the heart is long and thin, while the left is short and thick. The average weight of the heart is about eleven ounces. In the male it weighs from ten to twelve ounces, while in the female its weight is from eight to ten. The adult heart is five inches long by three and a half wide, by two and a half thick. It is divided into four chambers, namely, the right and left auricles and the right and left ventricles. The right side of the heart, which is more superficial and is called the venous heart, is separated from the left side of the heart, which is deeper and is called the arterial heart, by a longitudinal septum,and each of these lateral halves are divi led bya transverse septum,thus making the auricles and ventr
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