614 PHYSIOLOGY CHAP. 



of the hippocampus, he obtained temporary abolition of smell and 

 taste, in addition to loss of touch and hearing. None <>t' these 

 experiments as Terrier expressly points out can define the 

 exact limits of the centre of taste and smell ; but he believes that 

 the olfactory area is quite distinct from the area that reacts to 

 electrical stimulation. 



Qur experiments on dogs (1885) confirm the importance of 

 the hippocampal region for the olfactory sense. They further 



FIG. 304. External surface of right hemisphere of female infant 54 cm. long, still-born a month 

 before normal period of foetal maturity. (Flechsig.) The explanation refers to this and the 

 following figure. 



The figures on this and the following illustration indicate the chronological older in which the 

 fibres lying below the different cortical area become myelinated; the lett-T> show the older of 

 inyelination of different segments of the same area. The dotted surface shows the distribution 

 of miyelination, which is approximately the same as that observed in male infants of a month 

 old. The temporal lobe is pressed downwards, so as to open the Sylvian fissure and make visible 

 the convolutions of the island of Reil. The elementary fields become myelinated in the following 

 ordi-r: 1, lamina perforate anterior, trigonum olfactorium (invisible in both figures); 2, lobulis 

 paracentralis, upper third of the two central convolutions ; 26, median third of posterior central 

 convolution and, later, the corresponding convex segment of the pre-central (motor area) ; 3, 

 septum lucidum ; 4a, 46, gyms hippocampi; 5, lips of ealcarine fissure, occipital pole, gyms 

 descenders ; 6, gyms fornicatus ; 7, 1st temporal convolution ; la, upper' part of posterior con- 

 volution of island; 8, foot of 1st frontal; 86, subjacent part of gyrus fornicatus; 9, superior 

 segment of cuneus ; 10, inner surface of temporal pole ; 11, transverse convolution of frontal lobe, 

 orbital portion of 3rd frontal ; 12, gyrus subangularis ; 13, gyrus supra-angulai is ; 14, 146, 1st 

 temporal ; 15, 156, 1st frontal, particularly the inner surface and anterior part of gyrus fornicatus ; 

 16, 1st parietal; 17, lib, areas round field 5; 18, 186, foot of 2nd and 3rd frontal; lit. gyrus 

 supramarginalis ; 20, 3rd occipital ; 21, posterior segment of 1st parietal ; 22, greater part of 

 island ; 23, gyrus occipito-temporalis ; 24, 2nd occipital ; 25, small posterior inferior portion of 

 gyrus fornicatus (omitted); 26, at base of frontal lobe (omitted); 27, median segment of 3rd 

 frontal; 28, polar portion of 1st frontal (omitted); 29, rest of gyrus Bupramarginalis (omitted); 

 30 (erroneously marked 35), upper part of 2nd frontal; 31, over field 12 (omitted); 32, lower part 

 of island; 33,'portion of gyrus fornicatus lying below praecuneus ; 34, gyrus angularis ; 35, inner 

 surface of frontal lobe ; 36, 2nd and 3rd temporal convolution. 



show that the pes hippocampi major or the cornu Ammonia is 

 an important part of the olfactory centre. 



