. Lateral curvature of the spine and round shoulders . a, Fig. 10.—G. Herman Meyer. The Sys-tem OF the Sacrospinalis.—(Feiss.); b, longissimus dorsi; c,transversalis cervicis; d, trachelo-mastoideus; e, ileocostalis; y, as-cendens cervices; ^, ileolumbalis(hinder portion of m. quadratus luni-borum Auct.); A, obliquus capitisinferior; /, obliquus capitis superior;k, rectus capitis posterior major; /,rectus capitis posterior Fig. II.—G. Herman Meyer. Ante-rior Longitudinal Muscles of theTrunk.—{J^eiss.) a, Sternocleido-mastoideus; b, rectus ab-dominis ; c, pyramidalis. rigid, ha
. Lateral curvature of the spine and round shoulders . a, Fig. 10.—G. Herman Meyer. The Sys-tem OF the Sacrospinalis.—(Feiss.); b, longissimus dorsi; c,transversalis cervicis; d, trachelo-mastoideus; e, ileocostalis; y, as-cendens cervices; ^, ileolumbalis(hinder portion of m. quadratus luni-borum Auct.); A, obliquus capitisinferior; /, obliquus capitis superior;k, rectus capitis posterior major; /,rectus capitis posterior Fig. II.—G. Herman Meyer. Ante-rior Longitudinal Muscles of theTrunk.—{J^eiss.) a, Sternocleido-mastoideus; b, rectus ab-dominis ; c, pyramidalis. rigid, have an action on the spine. By the combined action of thesethree the erect position is maintained, or any variation from it is ac-complished. In making a side flexion of the spine from the erect position, for NERVE-SUPPLY. 11 example, no one muscle or group of muscles is alone active, but it impliesa concerted and coordinated action of all the groups mentioned to keepthe balance and perform the bending. The maintenance of the spinein the upright position by the muscles has been compared to the wayin which a flagstaff is held upright by stays reaching from the top ofthe staff to the ground. Although there is no one muscle runningfrom the head to the pelvis there is a continuous set of muscles supple-menting each others action. For example, in the anterior line thesternomastoid runs from the skull to the front of the top of the th
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