. Lateral curvature of the spine and round shoulders . ibs, from their heads to theirangles, and is convex vertically and horizontally. Laterally the cageis formed by the shafts of the ribs; it is somewhat convex vertically,and sharply convex from before backward. The anterior surface,slightly convex and directed fom-ard and downward, is formed by thesternum and the costal cartilages. The plane of the superior openingor inlet of the thorax is inclined fonvard and do\vnward, showing agreater obliquity in women than in men. The inferior border of thethoracic cage is formed by the twelfth thoraci
. Lateral curvature of the spine and round shoulders . ibs, from their heads to theirangles, and is convex vertically and horizontally. Laterally the cageis formed by the shafts of the ribs; it is somewhat convex vertically,and sharply convex from before backward. The anterior surface,slightly convex and directed fom-ard and downward, is formed by thesternum and the costal cartilages. The plane of the superior openingor inlet of the thorax is inclined fonvard and do\vnward, showing agreater obliquity in women than in men. The inferior border of thethoracic cage is formed by the twelfth thoracic vertebra, the lowerborders of the twelfth rib, and by two curved lines, extending fromthe anterior extremities of the last rib to the inferior angles of the gladio- MUSCLES OF THE SPINE AND THORAX. lus, touching the anterior extremities of the elevfenth rib and the costalcartilages of the tenth, ninth, and eighth ribs. The angle formed bythese lines is known as the subcostal angle. The inferior surface ofthe thorax is directed forward and Fig. 8.—G. Herman Meyer. The TwoOblique Mcscle Pulls.—(j^^m.) On the left the descending oblique, a,External intercostals; b, descending-oblique or externus abdominis. Onthe right the ascending oblique musclepull. c, Descending oblique or in-ternus abdominis; d, internal inter-costals ; e, scalenus colli ; f, cre-master.
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