Anatomy. — "On }fnsruius Traiisversus Orhltne'. By Dr. A. A. 

 HuEBEK. (Communicated by Prof. J. Hokkk). 



(Communicated in the meeting of November 30, 1918). 



This muscle vaiiety, already described by Boohdalkk ') was 

 seen in the body of a woman of 33 years of age. In many respects 

 it is different from Hochdalkk's tinding; it may, therefore, not be 

 undesirable to puldish this case. The muscular anomaly was present in 

 either orbit ; the right- and the left-muse, transversns displayed some 

 points of difference. 



In the left orh'd (Fig. 3) tlie muse, ti-ansversus generally passes 

 right across the equator of the eyeball, and is inserted into the 

 inner as well as into the outer wall of the orbit. 



About two mm. behind the trochlea the muscle arises from the 

 anterior part of the lamina papyracea ossis ethmoïdalis, to which it 

 is attached by a broad, thin, flat tendon about 7 mm. in width. 



The» tendinous fibres soon become mnscle fibres; the muscle, now 

 proceeding laterally, gets narrower and more rounded and passes 

 as a small muscle, 2 mm, in breadth, below the muse, obliquus 

 sup., decussating the latter at right angles. At a distance of about 

 1 cm. from the medial orbital wall the muscle widens and flattens 

 coincidently. This widening is brought about by the fact that muscle 

 fibres, issuing from the medial margin of the muse, levator palpe- 

 brae sup., bend round towards the medial, and pass into the muse, 

 transversus. The muse, transvei'sus then proceeds farther laterally 

 and is seen to decussate the fibres of the muse, levator palpebrae 

 in a very peculiar way. The fibres of the muse, trans versus pierce 

 those of the muse, levator palpebrae, but in such a way that the 

 muse, levator runs for the greater part across the upper side of the 

 muse, transversus; only a small muscular fascicle of about 3 mm. 

 across, passes below the muse, transversus. 



The two parts of the muse, levator, separated by the muse, trans- 

 versus, unite again when coursing anteriorly. At the point of decus- 

 sation the muse, transversus has a breadth of ± 4 mm., the muse, 

 levator of about 10 mm. 



^) BocHDALEK, Beltrag zu den anomalen Muskeln in der Augenhöiile. Viertel- 

 jahrschrift fur die Praktische Heilkunde. Prag. 1868. Bd. IV. 



