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.) J. 



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 ; 1 1, in the anterior perforated spot, marks the right optic nerve ; the left has 

 been cut short ; III, on the right cms 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 



