Volume 2

On the varieties in the muscular system of the human body / [Andrew Melville McWhinnie].

  • McWhinnie, Andrew Melville, 1807 or 1808-1866.
Date:
[1846]
Catalogue details

Licence: Public Domain Mark

Credit: On the varieties in the muscular system of the human body / [Andrew Melville McWhinnie]. Source: Wellcome Collection.

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    The muscles of the trunk, including more particularly the deeper seatedones of the thoracic and dorsal regions, pre¬ sent, as might be expected from their complexity and intricacy, many dif¬ ferences of minor importance—these consist chiefly in their constantly va¬ rying size and attachments to the spi¬ nous and transverse processes of the vertebrae, as well as to the other bones forming the walls of the chest, and consequently in their reciprocal con¬ nexions. Such differences are alluded to in the ordinary description of these muscles. In the muscles of the male and fe¬ male perineum no very striking pecu¬ liarities have occurred to me beyond those which are noticed in most anato¬ mical works. Muscles of the Neck —Superficial Region. Platysma myoides.—Presents many va¬ rieties in its development; stray and detached portions extending in dif¬ ferent directions, resembling the pan- niculus carnosus of animals; but less intimately connected with the inte¬ gument, being mostly separated from it by fat. A large fasciculus runningacross the muscle just below the chin—(Gant- zer, Zazorsky). A slip arising from the clavicle, ex- tendingoutwards towards the deltoid, where it became lost beneath the skin—(Gantzer). Sterno-cleido-mastoideus.—The clavicu¬ lar part arising by two and even three separate portions, as in some ani¬ mals; remaining perhaps distinct up to their insertion. No interval between the sternal and clavicular portions ; (he latter reach¬ ing as far as the outer third of the clavicle to meet the trapezius. Oftentimesa fleshy slip, perhaps ten¬ dinous at either extremity, crosses the upper part of the muscle near its in¬ sertion— (Albinus). The clavicular portion continued downwards to a considerable extent over the sternum to be connected with the “ rectussternalis.” By the intervention of the latter muscle when considerably developed it may be continuous with the rectus abdomi¬ nis, or with the fascia, covering the upper extremity of this muscle. A fleshy slip, extending from it to angle of the jaw—(Brugnone). SuBMAXILLARY R.EG10N. Diyastricus. —The posterior belly pro¬ portionally large when the stylo- hyoideus is absent. Double—(Al¬ binas). The fibres of the two anterior bel¬ lies blended with each other, and expanded into a muscular plane, with considerable attachment to the jaw — (Fleischmann, Erlanger Ab- handlung). The anterior belly on each side strengthened by a large fasciculus from the os hyoides, to be connected with the lower jaw, so that each ap¬ peared double—(Gantzer, Soemmer¬ ing). The anterior portion double— (Fleischmann). The posterior belly terminating at about the middle of the body of the lower jaw, having little or no con¬ nexion with the os hyoides ; thus re¬ sembling the more simple muscle of animals; as in the dog, where it consists of only one portion inserted into the middle of the lower jaw— (Douglas). Stylo-hyoideus.—Deficient on one or both sides. An additional muscle, the stylo-hyoideus of Albinus; it. may pass beneath the hyo-glossus to its insertion. The digastricus separating it from the proper stylo- hyoideus. The external carotid fre¬ quently runs between them, the accessory muscle lying more deeply and close to the stylo-'glossus. Connected by some of its fibres with the angle of the lower jaw. Sty/o-glossus.—Double on both sides— (Meckel). Deficiency of one or both—(Quain). Boehmer in such case found the other styloid mnscles stronger than usual. An accessory fasciculus to be connected with the middle of the pharynx; the stylo- pharyngeus alter of Boehmer. Some of its fibres arising from the angle of the lower jaw—(Theile). Sterno-Hyoid Region. Strrno-hyoideus. — Intersected by a tendinous line a little above the sternum, as in the giraffe. Arising from the middle of the clavicle — (Kelch). Intimately connected by cross fibres with its fellow, or united