. Journal of anatomy . in thenormal first thoracic rib. In class (I.) the ligamentous portion commonly starts posteriorly at the 380 Mr Frederic Wood Jones sulcus nervi brachialis, and the nerve cord and the subclavian artery lieupon the ligament. The ligament may continue to the sternum, or to theupper surface of the second rib, or it may give place to bone again at theanterior extremity of the rib (see fig. 3). In class (II.)—of which Sir William Turner has recorded and depictedmany cases—the first thoracic rib blends with the upper surface of thesecond rib at the point where the sulcus is f
. Journal of anatomy . in thenormal first thoracic rib. In class (I.) the ligamentous portion commonly starts posteriorly at the 380 Mr Frederic Wood Jones sulcus nervi brachialis, and the nerve cord and the subclavian artery lieupon the ligament. The ligament may continue to the sternum, or to theupper surface of the second rib, or it may give place to bone again at theanterior extremity of the rib (see fig. 3). In class (II.)—of which Sir William Turner has recorded and depictedmany cases—the first thoracic rib blends with the upper surface of thesecond rib at the point where the sulcus is formed upon the first rib. Atthis point the inner margin of the fused ribs is rounded and smooth, andshows an internal gutter such as was described in the atypical form of thefirst rib (see fig. 5). Cervical ribs.—A vast number of examples of cervical ribs is recordedin the literature of the subject, and the anomaly is so much more abundantthan the rudimentary condition of the first thoracic ribs that the citation. Fig. 5.—Bicipital rib. Rudimentary rib of class II., seen fromwithin. The nerve cords are numbered for a case ofrudimentary first thoracic rib. of individual cases is unnecessary. Cervical ribs also possess the samemain features as rudimentary first ribs, and they are to be divided intothe same two classes; for they may be fused with the first rib at a definitepoint, or they may be continued anteriorly to the sternum, or the firstrib, by a ligamentous process. As far as I know, there is only one caserecorded in which the seventh cervical ribs formed a complete bony circlearound the base of the neck. This case is ascribed to Albrecht, but I havenot seen the original account of the specimen. B3 a curious coincidence,it has been noticed by Turner, Lane, Dwight, and Phillips that the seventhcervical rib is grooved for the lowest cord of the brachial plexus, whichpasses over it. This groove is, of course, the sulcus nervi brachialis trans-ferred from the first thor
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
