328 
ZOOLOGY: S. R. DETWILER 
limbs is practically as complete as that of the limbs in their normal 
position. When transplanted posteriorly the distance of three seg- 
ments, the third spinal nerve no longer contributes to the innervation of 
the limb and the function of limbs in this position is less complete 
(table 2, series ASS). 
When transplanted posteriorly the distance of four segments, all 
cases studied, with one exception, show that the fourth spinal nerve no 
longer contributes to the innervation of the limb and that limbs in this 
position exhibit still greater imperfection of function (table 2, series 
AS4). 
FIG. 2. GRAPHIC RECONSTRUCTION OF THE RIGHT BRACHIAL PLEXUS OF CASE AS4«, SHOW- 
ING THE SEGMENTAL NERVE SUPPLY TO THE RIGHT ANTERIOR LIMB TRANSPLANTED 
THE DISTANCE OF 4 SEGMENTS POSTERIOR TO THE NORMAL POSITION. X 20 
In the series AS5 in which the limbs were implanted the distance of 
five segments posterior to the normal position, there occurred only one 
case of those studied (case ASS^^, table 2) in which the limb received 
innervation from the fifth spinal nerve, the remainder being innervated 
by nerves posterior to the normal brachial nerves. With this general 
failure of the limbs in this position to receive innervation from the 
normal brachial nerves, it is found that still greater restrictions are 
placed upon their movements, there being only four cases in thirty 
which functioned normally (table 1 A). 
In the series AS6 in which the limbs are so far removed that they 
receive no contribution from the normal limb nerves nor from the 
