Cited by W.H. Gaskell, 'On the Relation between the Structure, Function, Distribution and Origin of the Cranial Nerves; together with a Theory of the Origin of the Nervous System of Vertebrata', Journal of Physiology 10 (3) (1889), pp. 153-212.
Description:

Explanation of Plate XVI (figs. 1-5):

'Fig. 1. Portion of a section through the IlIrd cranial nerve of the dog, to show how the smallest fibres in the nerve congregate together at the periphery, preparatory to passing out into the oculomotor ganglion.

Fig. 2, Portion of a section through the middle of the oculomotor ganglion, to show that there are no large nerve fibres in the ganglion. (From the same series as Fig. 1.)

Fig. 3. Section through some of the short ciliary nerves immediately after their exit from the oculomotor ganglion. (From the same series as Figs. 1 and 2.)

Fig. 4. Section through some of the rootlets of the VIIth cranial nerve of the dog, to shot the presence of the large fibres in these rootlets.

Fig. 5. Section through the lVth cervical nerve of the rabbit at the origin of the phrenic nerve, to show the fibres of the phrenic nerve (B) separating out from the larger fibres of the IVth cervical nerve (A).' (209)

 

Figs. 1-3 in text:

'Fig. 1, PL. XVI, is a small portion of one of a series of sections taken through an osmic preparation of the IIIrd nerve of the dog. The sections were cut from the roots of the nerve towards the periphery and the section of which Fig. 1 represents a part was through the nerve just before the oculomotor ganglion was reached. Great numbers of the smallest fibres are seen coming to the periphery of the nerve, preparatory to entering into the oculomotor ganglion. Soon after this section the cells of the oculomotor ganglion begin to appear and Fig. 2, PI. XVI, represents a portion of one of the sections through the middle of the ganglion; all the fibres in among the ganglion cells are of the smallest size to be found in the IIlrd nerve. The continuation of the series of sections shows the formation of the short ciliary nerves from the ganglion, and as is seen in Fig. 3, PI. XVI, the fibres of which these nerves are composed are all very small and very uniform in size.' (164)

 

Fig. 3 in text:

'The reason then why the nerve cells with which the fine fibred motor nerves of the sphincter and ciliary muscles are connected are of the spinal type is because the fibres do not lose their medullary sheath in their passage through the ganglion; as is seen in Fig. 3, P. XVI, the short ciliary nerves are medullated as much as the small fibres in the roots of the oculomotor nerve which give origin to them.' (165)

 

Figs. 4-5 in text:

'In Fig. 5, PI. XVI, I give a section through the 4th cervical nerve of the rabbit at the point where the fibres of the phrenic are separating out from the rest of the fibres of the 4th cervical nerve; as is seen the fibres of the phrenic nerve (B) are very uniform in size and much smaller than the large motor fibres of the somatic muscles supplied by the 4th cervical nerve (A). If then any somatic fibres from the nucleus of the VIth passed out in the VIIth nerve they ought to be conspicuous by their size among the smaller motor fibres of the VIIth. Reasonino in this way I was much struck to find that in the roots of the VIIth nerve of the dog a small group of large fibres stands out most conspicuously; the size of the fibres being the same as those of the large motor nerves of the eye muscles, viz. 16µ-18µ. In Fig. 4, P1. XVI, these fibres are shown in the rootlets as they are found. Here then appeared to be positive evidence of the existence of somatic motor fibres in the roots of the VlIth nerve. Upon examination, however, of the nerves supplying the orbicularis and frontalis muscles I was unable to find that their fibres were different in size to those of the other facial muscles, and, indeed, section of the branches of the VIIth nerve after they had passed out of the stylomastoid foramen failed to show the presence of any group of especially large fibres.' (174-175)