Talk:Paper - The extent of the floor-plate of His and its significance

The extent of the floor-plate of His and its significance.

The summary of this paper is as follows: 1. A differentiated floor-plate extends no farther cephalad than the fovea isthmi. Increased morphologic significance is believed to attach to this depression. 2. The plan of arrangement of the longitudinal zones of His as set forth by him and generally accepted is interpreted as giving a wrong morphologic basis for the brain. 3. Theoretic considerations based partly on the ‘blastopore theory’ indicate: a) that the floor-plate corresponds to a ‘sutura neurochordalis’ (His); b) that the floor-plate and notochordal plate are primarily coextensive; c) that the neurochordal suture does not extend to the anterior end of the neural plate; d) that the primary motor and sensory zones are continuous from side to side cephalad of the anterior end of the fioor—plate. 4. The following interpretations are accepted: a) that the optic chiasma marks the anterior end of the neural plate; b) that the motor zone terminates with the midbrain; c) that the floor-plate terminates at the fovea isthmi ; d) that the boundary between motor and sensory zones terminates near the mammillary recess. 5. A rational basis for the division of the brain into epichordal and prechordal portions is afforded by the interpretation presented. 6. A number of facts of cephalic and encephalic morphology may be better interpreted on the basis suggested in this paper. A't7"mon’s Ans"rnAcr or This I-A1>1«:‘n Issmcb BY '1-an nnauosmpmc smzvrcxg, JULY 12