394 SPECIAL HISTOLOGY. 



are conveyed away from the eye are constructed in the same 

 simple manner as the excretory ducts of the lachrymal glands, 

 consisting merely of a dense connective tissue with numerous 

 networks of fine elastic fibres, particularly abundant in the 

 lachrymal canals, which appears to be a continuation of the 

 mucous membrane of the nose and of the conjunctiva, and of an 

 epithelium which, in the lachrymal canals, is of the squamous 

 kind, and in the lachrymal sac and nasal duct is furnished with 

 vibratile cilia, as in the cavity of the nares. The muscles of 

 the globe of the eye and of the eye-lids, as well as the musculus 

 Horneri, are all composed of transversely striped muscular fibres, 

 and together with their tendons, present no differences from 

 those of the trunk and extremities. The fascia bulbi oculi s. 

 Tenoni is a true fibrous membrane, and the trochlea is formed 

 principally of dense, connective tissue, in which only a few 

 cartilage cells can be seen. 



The vessels of the organs described in this section present little 

 worthy of remark. Excepting those of the muscles and skin, 

 they are most abundant in the palpebral conjunctiva, in which 

 they chiefly enter the papilla, and in the next place in the 

 lachrymal glands and the caruncula lachrymalis. The sclerotic 

 conjunctiva also contains numerous vessels, and the Meibo- 

 mian glands within the tarsi are also surrounded by a few. 

 Except in the skin of the eye-lids, lymphatics have only been 

 demonstrated by Arnold in the conjunctiva sclerotica, where 

 they form, at the border of the cornea, a closer, and more 

 externally a looser plexus, passing outwards in several small 

 trunks. The palpebra and conjunctiva are everywhere well 

 supplied with nerves, but their relations have been minutely 

 examined only in the conjunctiva. In this membrane, in Man, 

 I have found terminal plexuses as in the external integument, 

 with numerous divisions of fibres, 0*001 — 0"006'" thick, ex- 

 tending up to the margin of the cornea, together with pretty 

 clear indications of loops and free terminations. Besides 

 which, in one instance, there were presented, towards the 

 palpebral conjunctiva, peculiar " nerve-coils," 002 — 0*28"' in 

 size, into which a single nerve-fibre usually entered, whilst 

 2 — 4 were given off from it (via 1 . Mik. Anat. II, 1, p. 31, 

 fig. 13. A, 3). The relations of the nerves of the lachrymal ap- 

 paratus are entirely unknown. 



