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Extracts from British and Foreign Journals. 
THE PHYSIOLOGY OF THE NERVOUS SYSTEM. 
Dr. Buown-Sequard. 
Dr. Henry, in his Abstract of the Lectures’ lately 
delivered in London by Dr. Brown-Sequard, gives the fol- 
lowing general recapitulation of their object : 
1. The gray matter of the cord is the principal channel by 
which sensitive impressions are conveyed to the brain. 
2. The anterior columns have a share in the transmission 
of sensitive impressions. 
3. Injury of one lateral half of the cerebro-spinal axis 
produces certain well-marked features, according to the fol- 
lowing table : 
a. Injury of the brain produces — 
On same side , 
Anaesthesia. 
Paralysis. 
Increased temperature. 
On opposite side , 
Normal sensation. 
Normal motor power. 
Normal heat. 
b. Injury at any point from the tubercula quadrigemina to 
the medulla oblongata above the decussation in the pyramids 
produces — 
On same side , 
Anaesthesia. 
Paralysis. 
Diminished temperature. 
On opposite side , 
Hyperaesthesia. 
No paralysis. 
Increased temperature. 
c . Injury of the medulla oblongata at the crossing in the 
pyramids produces paralysis of motion on both sides : other- 
wise the symptoms are the same as in b , when the pons varolii 
is injured. 
d. Injury of the spinal cord on one side produces — 
On same side. On opposite side. 
Anaesthesia. Hyperaesthesia. 
No paralysis. Paralysis. 
Diminished temperature. Increased temperature. 
Anaesthesia and diminished temperature almost always 
accompany each other; but an exception is observed in 
