Picture - Cosmic Polymath

PROTOPLASMIC, AMGEBIC, AND OTHER MOVEMENTS 325
PLATE LXXXV
Fig. 6. Fig. 7. Fig. 8.
PLATE LXXXV {cuntimicl)
Pig. 2.—Photograph of a transverse section by the Author of the right and left ventricles of the heart of a deer, near the base
of the ventricles. Shows that the left ventricular cavity {h) is completely closed by the spiral twining of the musculi papillares ; the
right ventricular cavity [a) being all but closed. The walls of the left ventricle and septum (J, g, d) are comparatively very much
thicker than those of the right ventricle (e).
Fig. 3.—Photograph of a transverse section by the Author of the left ventricle of the same heart near the apex ;
cavity being all but occluded by the powerful spiral twining action of the musculi papillares (f, g).
the ventricular
Fig. 4.—Photograph of a transverse section by the Author of the same ventricle still nearer the apex ; the ventricular cavity
being quite obliterated by the strong spiral action of the muscular fibres of the apex.
Fici. 5.—Photograph of a dissection by the Author of the base of the right and left ventricles of the heart of a heifer after
removal of the right and left auricles. Shows the ventricular cavities quite open, and the orifices of the aorta and pulmonary artery
partly closed by the semi-lunar valves, a. Right ventricular cavity, open as in diastole ; ft, left ventricular cavity, ditto ; c, 'l,
the deeper fibres being, for the most part,
fibrous rings from which certain of the superficial muscular fibres of the ventricles arise ;
continuous beneath the rings ; e, basal fibres of the right ventricle ; /, ditto of
remains of semilunar valve ; h, ditto of aorta ; i, infundibulum.
left ventricle ; g, orifice of pulmonary artery with
Fig. 6.—^Photograph of a transverse section by the Author of the apices of the right and left ventricles of the heart of a sheep.
The apices {v, w) are open as in diastole. The muscular fibres of the left apex are seen winding spirally out of the interior of
the left apex in two sets {x, y). The two sets of fibres (c, y) form the beginnings of the two musculi papillares, which pursue spiral
courses within the left ventricular cavity.