No. 2. — CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY 

 OF THE MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD 

 COLLEGE, UNDER THE DIRECTION OF E. L. MARK, No. 172. 



Tlie Development of the Oculomotor Nerve, the Ciliary Ganglion, 

 and the Abducent Nerve in the Chick. 



By Frederic Walton Carpenter. 



TABLE OF CONTENTS. 



Introduction 142 



Part I. — Anatomy and Histology 143 



A. Historical Survey . . . 143 



a. Anatomy 143 



1. Eye-Muscle Nerves . . 143 



2. Ciliary Ganglion . . 144 



b. Histology 147 



1. Oculomotor Nerve . . 147 



2. Abducent Nerve ... 147 



3. Ciliary Ganglion and 



Short Ciliary Nerves . 147 



B. Observations 151 



a. Methods 151 



b. Anatomy 152 



1. Eye-Muscle Nerves and 



Ciliary Ganglion 



c. Histology .... 



1. Oculomotor Nerve 



2. Abducent Nerve . 



3. Ciliary Ganglion 

 Part II. — Development . . 



A. Historical Survey 



1. 

 2. 

 3. 

 4. 

 6. 



Fishes . . 

 Amphibians 

 Reptiles 

 Birds . . 

 Mammals . 



B. Observations 



1. Methods . 



2. Development of the Ocu 



lomotor Nerve, the Cil- 

 iary Ganglion, and the 

 Abducent Nerve , de 

 scribed by Stages 



152 

 155 

 155 

 155 

 156 

 159 

 159 

 160 

 167 

 167 

 169 

 171 

 175 

 175 



177 



FAOB 



Stage I 177 



1. Oculomotor Nerve . 177 



2. Eye Muscles ... 178 

 Stage II 178 



1. Oculomotor Nerve . 178 



2. Ophthalmic Branch 



of the Trigeminal 



Nerve 179 



3. Eye Muscles ... 180 

 Stage III 180 



1. Oculomotor Nerve 



and Ciliary Gan- 

 glion 180 



2. Ophthalmic Branch 



of the Trigeminal 



Nerve 182 



3. Abducent Nerve . . 183 



4. Eye Muscles . . . 184 

 Stage IV 185 



1. Oculomotor Nerve . 185 



2. Ophthalmic Branch 



of the Trigeminal 



Nerve 187 



3. Ciliary Ganglion . . 190 



4. Abducent Nerve . . 193 



5. Eye Muscles ... 193 

 Stage V 193 



1. Oculomotor Nerve . 194 



2. Ophthalmic Branch 



of the Trigeminal 



Nerve 196 



3. Ciliary Ganglion . . 198 



4. Abducent Nerve . . 198 



5. Eye Muscles ... 199 



