A CASE OF CYCLOPIA 



207 



terior convex margin where it dips down beneath the bulbus 

 oculi. An anomalous band of muscular tissue passes obliquely 

 across the upper aspect of the maxillary element and over the 

 2nd division of the fifth nerve. From its relation to the nerve 

 this muscle may (?) represent the rudimentary bundle described 

 as Muller's muscle in the normal orbital fossa. 



Second stratum (fig. 9). The third and sixth nerves, and the 

 ophthalmic division of the fifth nerve on each side, together with 



;Mx.V. 



Fig. 9 Diagram of structures exposed in dissection of orbital fossa from above; 

 second stratum. C, small opening in fornix conjunctivae; R.L., rectus lateralis 

 muscle; S.P.M., superior postero-median muscular band; other lettering as in 

 figure 8. 



the median carotid artery were cut posteriorly and reflected 

 forward to expose the muscular mass situated beneath (they are 

 not represented in the figure). 



From the median notch formed by the junction of the two 

 maxillary elements there arises a thin muscular band which 

 anteriorly becomes divided into two symmetrical halves as 

 indicated in the diagram. It becomes inserted into the central 

 tendinous mass. On reflecting this muscle forwards, another 

 similar, though slightly larger, muscular band is seen lying im- 

 mediately beneath it. (For the sake of convenience in de- 

 scription these muscles will be termed the superior and inferior 



