IV 



HE 



CM 



N.3I 



N.2I. 



N.es 



FiG. 227. Diagrammatic figure of a Human Embryo, lettered by Professor 

 His, Ko, and estimated as thirty-one days old. The brain and spinal 

 cord, and the cranial and spinal nerves are shown, and certain of the other 

 organs are represented in outline. The bases of the fore and hind limbs 

 are indicated by the dotted outlines. In all cases in which the full length 

 of the nerve is not shown, the end is represented as though cut across. 

 (After His.) x 10. 



BF, thalamenoephalon. BM. mid-brain. BS, cerebral hemisphere. BY, olfactory 



lobe. El, auditory vesicle. FG, Froriep's ganglion. GO, ciliary ganglion. HM, 

 hyomaiidibular cleft, or external auditory meatus. KT.1, ganglion of first cervical nerve. 

 3ST.9, ganglion of first thoracic nerve. N.21, ganglion of first lumbar nerve. N.26- 

 gan -linn of first sacral nerve. Tf.31, ganglion of first coccygeal nerve. NH, phrenic 

 nerve. OC, optic: cup. OF, olfactory pit. RB, left auricle. RV, ventricle. STJ, 

 sinus praecervicalis. TI, vitelline loop of intestine. TL, tail. W, liver. Ill, third 

 cranial nerve. IV, fourth cranial nerve. V, Uasserian ganglion. V, ophthalmic 

 brancli of fiftli, or trigeminal nerve. V&, maxillary branch of fifth, or trigeminal nerve. 

 Vc, mandibular branch of fifth, or trigeminal nerve. VII, ganglion of the seventh, or 

 facial nerve. VIII, ganglion of the eighth, or auditory nerve. IX, ninth, or glosso- 

 pliarvngeal nerve. X, ganglion of t lie root of tlie tenth, or pneumogafltxio nerve. XI. 

 r< lots' of the eleventh, or spinal accessory nerve. XII, roots of the twelfth, or hypoglossal 

 nerve. 



M M 



