SWEDENBORG also supposed that such a very easily flowing nervous fluid, ›fluidum spirituosum›, communicated the impressions of the senses and the impulses of motion: but this fluid determined the connection between sense-organs and muscles on the one hand, and the _cortex_ of the brain on the other. It was thus _the cerebral cortex! to which the impressions of the senses were carried, and from this the voluntary impulses were sent out_ to the muscles. The cortex was thus the seat of both the sensory and motor activities of the soul in the body. Œc. R. A. III., No. 133: ›Substantia enim corticalis est ipsum cerebrum, seu sensorium et motorium commune.›[32] But SWEDENBORG was not contented with this general idea of the cortex as the seat of the sensations and the will. He also drew conclusions from his previous experience and results regarding the continuous connection between the elements of the cortex and the ends of the nerves distributed in the various parts of the body. On the basis of this connection he ascribed to the ›_Cerebellula_› a very important rôle in the activity of the brain. In the first place they received, through the external sense-organs and nerves, impressions from the outer world and worked them over: they were a kind of _inner sense-organs_.[33] And since the sensory impressions were so richly various as well in kind as in degree, the ›Cerebellula› must also possess various individual qualifications corresponding to these various sensory impressions. They were, at the same time, connected with one another, and so arranged into superior and inferior groups that they could receive and work over the various kinds of sensory impressions.[34] There were also other groups of grey substance in the interiors of the brain, through which the sensory nerves passed; but all sensory impressions must ultimately be gathered together in the cortex of the brain so as to become conscious perceptions. (Thus, for example, SWEDENBORG describes the optic thalami as such a secondary centre in the course of the path of sight;[35] and the corpora striata in the path of the sense of smell;[36] and the origin of conscious tactile sensations he describes thus: — — — ›rudior quicunque _tactus a superficie_ totius per medios nervos _in Medullam Spinalem aut Oblongatam_ et abinde _in activissimum cinerem_, et _in circumfusum corticem Cerebri_ emicet: Adeo ut _extremi receptus modorum sint in cortice Cerebri, qui conscius redditur_ mutationum in seriebus et substantiis compositis usquam contingentium.› Œc. R. A. II., 192). Thus: although SWEDENBORG did not suppose the ›Cerebellula› to be arranged into sensory centres in the same manner as we do, still he seems to have supposed an arrangement something resembling this, with _Cerebellula-groups_ as _subdivisions of the great sensible centre-organ, which is formed by the ›Cerebellula› of the brain cortex, taken together_, and which Swedenborg called ›Sensorium commune.›