. The myology of the raven (Corvus corax sinuatus.) A guide to the study of the muscular system in birds . other two pectoral muscles which arise fromthe sternal body. This muscle when contracting depresses the humeruswith great force, and consequently the wing of the bird,and so forms the chief agent of flight. In describing the pectoralis major for Ijirds in general,Sir Eichard Owen says that This muscle is very long Ohne Namen erwiilint. Schopss, p. Owen, p. 24. Fanniculus carnosis (second jmrtion). Eeid, p. des jmrures. Gervais et Alix ; Alix, p. 401. ,, „
. The myology of the raven (Corvus corax sinuatus.) A guide to the study of the muscular system in birds . other two pectoral muscles which arise fromthe sternal body. This muscle when contracting depresses the humeruswith great force, and consequently the wing of the bird,and so forms the chief agent of flight. In describing the pectoralis major for Ijirds in general,Sir Eichard Owen says that This muscle is very long Ohne Namen erwiilint. Schopss, p. Owen, p. 24. Fanniculus carnosis (second jmrtion). Eeid, p. des jmrures. Gervais et Alix ; Alix, p. 401. ,, „ „ Watson, p. 81. [See the present writei-s description of the dermo-lnnneraUs inthe present connection.] THE MUSCLES OF THE UPPER EXTREMITY. 71 and wide in the Natatores generally, but in the Penguin,its origin is limited to the external margin of thesubjacent pectoral muscle, which is here remarkablydeveloped. The great pectoral is very long, but notvery thick in the Easores. In the Herons it is shorter,but much stronger and thicker. Its size is mostremarkable in the Humming-birds, Swallows, and. Fig. 25.—Anterior aspect of Ihe of a Raven, designed to sliow the areasof origin of the pectoral group of muscles. The subclavius lies beneaththe p. tertvus. Life-size, from the specimen. diurnal birds of j)rGy, where it is attached to almost thewhole outer surface of the sternum, and its crest,and has an extended insertion. In the Ostrich itsorigin is limited to the anterior and external eighthpart of the sternum, and it is inserted by a feebletendon into the commencement of the pectoralcrest of the humerus, to which it gives a strong rotarymotion forwards. In the Apteryx the pectoralis major V2 THE MYOLOGY OF THE RAVEN. is represented by two tliin triangular layers of themuscular fibres attached to the under and lateral partof the sternum, and converging to be inserted into theproximal third of the minute humerus {Anat. of Verts.,vol. ii., p. 9G). 50. The pectoralis
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmuscles, bookyear1890
