8o BIOLOGICAL PHYSICS 



within the substance of the muscular structures to which they 

 are distributed (Figs. 19, 20). 



The neurilemmae surrounding the motor nerve-terminal 

 fibrils become continuous with the sarcolemmae of the 



FIG. 14. BASE OF THE BRAIN WITH THE ORIGINS OF THE CEREBRAL 

 NERVES. (Allen Thomson.) . 



This figure is taken from an adult male brain which had been hardened in alcohol. 



i, superior longitudinal fissure ; 2, the olfactory tract and sulcus ; 2', orbital con- 

 volutions ; 2", inferior frontal convolution ; 3, 3, 3, fissure of Sylvius ; 4, 4, 4, 

 temporo-sphenoidal lobe ; 5, 5', occipital lobe ; 6, on the right anterior pyramid 

 of the medulla oblongata above the decussation ; 7, amygdaloid lobe of the cere- 

 bellum ; 8, biventral lobe; 9, slender lobe; 10, posterior inferior lobe; +, the 

 inferior vermiform process ; I, olfactory bulb ; I', the tract divided on the left 

 side ; II, in the anterior perforated spot, marks the right optic nerve ; the left has 

 been cut short ; III, on the right crus cerebri, denotes the third nerve ; IV, the 

 fourth nerve; V, the fifth; VI, on the pons Varolii, the sixth; VII, also on 

 the pons Varolii, the facial with the auditory nerve on its outer side ; XI, on the 

 cerebellum below the flocculus, indicates the spinal accessory nerve ; between it 

 and the auditory are seen the glosso-pharyngeal and the vagus; XII, on the 

 upper part of the left amygdaloid lobe, denotes the hypoglossal nerve ; C 1 , on 

 the same, the suboccipital nerve. 



various muscular fibres on which they are spread, or with 

 which they are connected, the terminal organs, or " muscle 

 plates " excreting into the substance of these structures 

 their entire contents, and, consequently, their effete 



