52 H. LISSER 



Fig. 29 Cross section of human Embryo no. 22 (20 mm.) to show especially supe- 

 rior laryngeal nerve and nerve recurrens. 



Fig. 30 Cross section of human Embryo no. 22 (20 mm.) to show, especially, 

 M. interarytaenoideus and aryepiglotticus. This section shows at the mark (x) 

 the tendency to continuity between the laryngeal and pharj'ngeal musculature, 

 as- mentioned by Strazza. 



Fig. 31 Cross section of human Embryo no. 22 (20 mm.) (very low in laryngeal 

 region). 



Fig. 32 Cross section of human Embryo no. 22 (20 mm. ) to show thyreoid cartil- 

 age, cricoid cartilage, and hyoid bone. Also M's cricoarytaenoideus posterior and 

 thyreorarytaenoideus. 



Fig. 33 Graphic reconstruction of nerve recurrens and its branches in relation 

 to the laryngeal muscles and cartilages in human Embryo no. 22 (20 mm.) br. 1, 

 Branch of n. recurrens, to M. cricoarytaenoideus posterior; hr. 2, branch on n. 

 recurrens to M.'s cricoarytaenoideus lateralis and thyreoarytaenoideus; br. 3, 

 branch of n. recurrens to M. thyreoepiglotticus; hr. 4, branch of n. recurrens to 

 M.'s interarytaenoideus and aryepiglotticus. 



Fig. 34 Graphic reconstruction of motor branch of superior laryngeal nerve in 

 human Embryo no. 22 (20 mm. ) . 



Fig. 35 Graphic reconstructions of laryngeal muscles, and cartilages, and their 

 relations in human Embryo no. 22 (20 mm.) ary. epi., M. aryepiglotticus; thy. 

 epi., M. thyreoepiglotticus; c. s., thy. c, cut surface thyreoid cartilage. 



