PLATE L. 



Class AMPHIBIA continued. 

 THE FROG continued. 



FIG. 1. CEREBRO-SPINAL AND SYMPATHETIC NERVOUS SYSTEMS : VENTRAL VIEW. 

 x 2. 



I. olfactory nerve to the olfactory bulb : II. optic nerve to the eye : 

 X. tenth cranial nerve : 2. second spinal nerve (brachial) : 

 s. sciatic nerve : s. l one of the sympathetic ganglia. 



FIG. 2. BRAIN : DORSAL VIEW, x 5. 



ol. olfactory lobes : c. cerebral lobes : p. pineal body : t. optic thalamus : 



0. optic lobes : cm. cerebellum : IV. roof of the fourth ventricle : 

 m. medulla oblongata. 



FIG. 3. BRAIN : VENTRAL VIEW, x 5. 



0. c. optic commissure : i. infundibulum : p. pituitary body : I.-XI. 



the various cranial nerves. 



FIG. 4 BRAIN : SIDE VIEW, x 5. 



01. olfactory lobe: c. cerebral lobe: p. pineal body: o. optic lobe: 



cm. cerebellum : m. medulla oblongata : o. t. optic tract : 



1. infundibulum with pituitary body attached. 



FIG. 5. BRAIN : LONGITUDINAL AND VERTICAL MESIAL SECTION BEHIND THE 

 CEREBRAL LOBES, x 5. 



c. optic chiasma: v. s third ventricle: cm. cerebellum: r. 4 fourth 

 ventricle : m. medulla oblongata. 



FIG. 6. BRAIN : LONGITUDINAL HORIZONTAL SECTION SHOWING THE VENTRICLES. 

 x 5. 



L, II., III., IV. the corresponding ventricles : /. foramen of Monro : 

 i. aqueduct of Sylvius, or iter. 



FIG. 7. DISSECTION OF THE LEFT SIDE OF THE HEAD, x 3. 



e. eye : t. tongue : s. squamosal bone : h. hyoid bone : V. fifth nerve 

 (trigeminal) : VII. seventh nerve (facial): X. tenth nerve 

 (pneumogastric or vagus) : s. l first spinal nerve (hypoglossal) 



