. Electro-physiology . Fig. 10.—Anode of Battery. Polar region of nerve is anodic. Peripolar region of nerve is cathodic. Fio. 11.—Cathode of Battery. Polar region of nerve is cathodic. Peripolar region of nerre is anodic. " Confining our attention to the first electrode, let us see what will happen according as it is anode or cathode of a galvanic current, Figs. 10 and 11. If this electrode be the anode of a current, the latter enters the nerve by a series of points and leaves it by a second series of points ; tiie former, or proximal series of points, collectively constitutes the polar
. Electro-physiology . Fig. 10.—Anode of Battery. Polar region of nerve is anodic. Peripolar region of nerve is cathodic. Fio. 11.—Cathode of Battery. Polar region of nerve is cathodic. Peripolar region of nerre is anodic. " Confining our attention to the first electrode, let us see what will happen according as it is anode or cathode of a galvanic current, Figs. 10 and 11. If this electrode be the anode of a current, the latter enters the nerve by a series of points and leaves it by a second series of points ; tiie former, or proximal series of points, collectively constitutes the polar zone or region; the latter, or distal series of points, collectively consti- tutes the Y>eripolar zone or region. In such case the polar region is the seat of entrance of current into the nerve,—, is anodic; the peripolar region is the scat of exit of current from the nerve,—, is cathodic. If, on the contrary, the electrode under observation l)e the cathode of a cur- rent, the latter enters the nerve by a series of points which collectively constitute a ' peripolar' region, and it leaves the nerve by a series of points which collectively constitute a ' polar' region. The current, at its entrance into the bod}-, diffuses widely, and at its exit it concentrates ; its ' density ' is greatest close to the electrode, and, the greater the distance of any point from the electrode, the less the current densit}' at that point; hence it is obvious that the current densit}' is greater in the polar than in the peripolar region. These conditions having been recognized, we
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