36 THE NERVOUS SYSTEM 



or with motor paralysis which is most marked in the lower 

 limb. 



Lesions of limited extent in the region of the genu produce 

 a condition which has been termed pseudo-bulbar paralysis, 



FIG. 21. Dissection of Brain, showing the Lateral Aspect of the 

 Internal Capsule. 



NOTE. The overlying cortex, the claustrum, the external capsule and the lentiform 

 nucleus have all been removed. 



1. Internal capsule. 



2. Corona radiata. 



3. Optic radiation. 



4. Anterior commissure. 



5. Olfactory bulb. 



6. Optic nerve. 



7. Optic tract. 



8. Uncus. 



9. Temporal pole. 

 10. Mid-brain. 



16. Olive. 



11. Oculo-motor nerves. 



12. Trochlear nerve. 



13. Pons. 



14. Motor fibres in pons. 



15. Pyramid. 



the fibres implicated being those destined for the tongue, 

 palate, etc. It is said that this condition may be caused by 

 unilateral lesions, but there is a disposition to believe that 

 the lesion is bilateral or that, if unilateral, it is accompanied 



