Cabpenteb. — Oculomotor Nerve in Chick. 



PLATE 7. 



All the Figures of this Plate are from photomicrographs. 



Fig. 21. Transverse section of oculomotor nerve of fowl corresponding to A 



Figure 3 (PI. 2). X 86. 

 Fig. 22. Transverse section of branch of oculomotor nerve of fowl supplying 



dorsal rectus muscle. X 86. 

 Fig. 23. Section frontal to hind-brain of an embryo in Stage II (70 hrs. incu- 

 bation), showing connection of maxillo-mandibular portion of Gas- 

 serian ganglion with ectoderm, and fundament of posterior rectus 

 muscle. Stained in haemalum. X 266. 

 Fig. 24. Section transverse to longitudinal axis of mid-brain of an embryo in 

 Stage III (88 hrs. incubation), showing longitudinal section through 

 entire length of oculomotor nerve. Fixed in corrosive-acetic mixture 

 and stained with iron hematoxylin. X 44. 

 Fig. 25. Parasagittal section of an embryo in Stage V (119^ hrs. incubation), 

 viewed from right side, and showing longitudinal section through 

 communicating ramus between ophthalmic branch of trigeminal nerve 

 and ciliary ganglion. For significance of /8 and y, see explanation 

 of Figure 10 (PI. 3). Fixed in Zenker's fluid and stained with iron 

 hasmatoxylin. X 173. 

 Fig. 26. Parasagittal section through an embryo in Stage V (119^ hrs. incuba- 

 tion), viewed from right side, and showing oculomotor nerve, ciliary 

 ganglion, abducent nerve, and fundaments of eye muscles. Fixed in 

 Zenker's fluid and stained with iron liEematoxylin. X 40. 

 Note. — By an oversight the /)Ziis sign (+) has been omitted from the 

 Plate in the abbreviation mu. rt. v. + a. 



