248 



THE NERVOUS Sl'STEM 



TOPICAL OUTLINE 



Coverings 



Structure 



f Pia mater . 

 Arachnoid . 



Dura mater 

 Cerebrum . 



Cerebellum 



Medulla . . , 

 f Cerebrum . 



Functions \ Cerebellum 



| 



I Medulla . 



NERVOUS 

 SYSTEM . 



f Cerebro- 

 spinal . 



Sympathetic 



NERVE SUB- 

 STANCE . . . 



NERVE 

 FIBRES 



NERVES 



Cellular . . 



I Fibrous . . 



| Fresh . . . 

 I After death 



f Afferent . . 



I 



Efferent . . 

 Mixed . 



f Inner, delicate, vascular. 

 \ Closely invests the brain. 

 [ Follows all the convolutions. 



A serous membrane. 

 f Tough, fibrous. 

 I Outer surface rough, and in contact with the 



skull. 



I Inner surface smooth. 

 f Right and left hemispheres. 

 I Surface convoluted. 

 I Fills all upper portion of cranium. 

 I Gray matter outside. 

 I Right and left hemispheres. 

 | Surface drawn into folds. 

 ] Fills occipital portion of cranium. 

 I Gray matter outside. 

 \ Connects the brain with the cord. 

 ' Gray matter inside. 

 { Chief seat of sensation. 

 -j The organ of the will and voluntary motion. 

 ( The seat of the intelligence. 

 \ The seat of muscular sense. 

 i Co-ordinates muscular movements. 

 f Governs the muscles of respiration and deglu- 



tition. 



A conducting medium between the brain and 

 I the cord. 



f Consists of Jrain and its nerves. 



I Spinal cord and its nerves. 



I Fibres distributed to \ ?/f " S f 8en8e ' 1 



I Voluntary muscles. 



f Double chain of ganglia, on 



f Consists of 



f 



vertebral 



Various disconnected ganglia. 

 f The internal organs. 



Fibres distributed to I The walls of blood- 

 (. vessels. 



Grayish in nerve centres. 

 \ Nerve fibres forms nerves, and enters into 

 ' the structure of nerve centres. 



A simple semitransparent filament. 

 i A tube, containing a white opaque sub- 

 ' stance. 



i Convey impressions to a centre only. 

 ' Also called sen. wry nerves. 

 C Convey impressions from a centre only. 

 -j Fibres terminate in muscular fibres. 

 i Also called motor nerves. 



Contain both afferent and efferent fibres. 



