CHORD AT A 



333 



have considered thus far; from it passes off the spinal cord, which 

 lies in the neural canal of the vertebral column, and send 

 pair of nerves for each vertebra, which go to the various parts 

 of the body. The muscles are attached to the bonus, and serve 



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Fig. 334. Columba livia. Dissection from the right side ; intestine 

 partly displaced, a. ao, aortic arch ; bd.i, bd.2, bile ducts ; b.fabr, 

 bursa fabricii ; ^/.cerebellum; coe, right caecum ; cpdm, coprodseum ; cr,cere\ crb.h, left 

 cerebral hemisphere; crp. crop, cut open; cv.v.r, first cervical vertebra; ducoe, diaccele; 

 dnt, dentary; duo, duodenum; eus.ap, aperture of Eustachian tube; giz, gizzard, dotted 

 behind the liver ; gl, glottis; gul, gullet, in part cut open; ilm, ilium ; i.orb.sp, interorbital 

 septum; id, right kidney; Ing, right lung; Ir, liver, right lobe; »a, bristle passed from 

 nostril into mouth; obl.scp, oblique septum; o.gl, oil gland; ped, pericardium; pmx, 

 premaxilla; pa, pancreas; pn.b, pineal body; pn.d.1-3, pancreatic ducts; pr.cv, right pre- 



il; prdm, proctodaeum; prvn, proventriculus, dotted behind the liver; ptxv, poster 

 pty.b, pituitary body; pygst, pygostyle; r.au, right auricle; r.br, right bronchus; ret, rec- 

 tum; r.vnt, right ventricle; sp.cd, spinal cord; spl, spleen, dotted behind the liver; s.rhb, 

 sinus rhomboidalis ; s.scr, syn-sacrum ; st, carina sterni ; syr, syrinx; tii.v.i . first 

 tk.v.5, filth thoracic vertebrae;' tng, tongue ; tr, trachea ; A, right testis ; ur, aperture "I left 

 ureter; urdm, urodamm ; v.df, aperture of left vas deferens. (After Parker ami Haswell.) 



to move them ; the largest are the muscles of the thigh and leg, 

 and the muscles of the breast; the latter are the large pectoral 

 muscles attached to the keel of the sternum, and serve to move 

 the wings in flight. 



The digestive system begins at the mouth, which is entirel 



