PLATE 1 



EXPLANATION OF FIGURES 



1 Dissection of ventral portion of neck and cephalic portion of thorax to 

 show course of trachea, X h Adult male. 



2 Dissection of syringeal region. The ventral body wall and the heart 

 have been removed to show the syrinx in position, X 3. Adult male. 



3 Pessulus, X I65. Young adult male. 



ABBREVIATIONS 



a, apices of pyramids 



an, B LB II., anlage of first and second 

 bronchial half-rings 



an.i. S.C.I, II, III, I v., anlagen of first, 

 second, third and fourth intermedi- 

 ate syringeal cartilages 



an.pes., anlage of pessulus 



ant.l.p., antero-lateral process of ster- 

 num 



br., bronchidesmus 



b.v., blood vessels 



b.w., body wall 



B., typical bronchial half-rings 



b., ossified portion of shaft 



b.sur., basal surface of shaft and pyr- 

 amids 



BI,BII,BIII, first, second and third 

 bronchial half-rings 



b.m., basement membrane 



c, crop 



cor., coracoid 



c.d.m., ventro lateral muscle bundles 



c.mes., condensed mesenchyma 



d.sur., dorsal surface of pyramid 



dor. p., dorsal pyramid of pessulus 



e.t.m., external tympanic membrane 



ep.t., epithelial tube 



ep., epithelium 



inf. I., lower larynx or syrinx 



i.m., interannular membranes 



i.t.m., internal tympanic membrane 



i.s.c, intermediate syringeal carti- 



i.c.m., developing interannular and 



intercartilaginous membranes 

 lat.b., lateral borders of pyramids 

 Lb., lateral border of shaft 

 m.c, marrow cavity 

 vi.b.ui., medial bronchial wall 

 mes., mesenchyma 

 oe., oesophagus 

 pes., pessulus 



per., developing perichondria 

 st.h.m., sterno hyoid muscle 

 sup. I., upper larynx 

 st.tr.m., sterno trachealis muscle 

 s., shaft of pessulus 

 sem.m., semilunar membrane 

 sm., submucosa 

 tr., tracheal rings 

 T., tympanum 

 V.C., vertebral column 

 ven,p., ventral pyramid 

 ven.s.p., ventral surface of pyramid 



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