Chap. IV.] 



ORBIT AND EYE. 



ordei- : (1) The skin ; (2) the subcutaneous tissue ; 

 (3) the orbicularis palpebrarum ; (4) the tarsal carti- 

 lage and ligament ; (5) the layer of Meibomian glands; 



and (6) the conjunctiva. 

 In the upper lid the le- 

 vator palpebrse is found 

 passing to the tarsal 

 cartilage. The subcu- 

 taneous tissue is very 

 lax, and hence the lids 

 swell greatly when 

 cedematous, or when in- 

 flamed, and when the 

 seat of haemorrhage. On 

 this account it is inad- 

 visable to apply leeches 

 to the lids, on account 

 of the extensive "black 

 eye " that may follow. 

 This tissue is peculiar 

 in containing no fat. 

 At the edge of the lids 

 are found the eyelashes, 

 the orifices of the Mei- 

 bomian glands, and of 

 some modified sweat and 

 sebaceous glands. This 

 edge, like other points 

 of junction of skin and 

 mucous membrane, is 

 apt to be the seat of 



irritative affections. Be- 

 ing a free border also, 



Fig. 11. Vertical Section through 

 Ui>per Eyelid. (After Waldeyer.) 



o, Skin ; 6, orlm-ularig ; ', its ciliary part ; 

 f, involuntary muscle of eyelid ; d, con- 

 junctiva; e, tarsal cartilage;/, Meibo- 

 mian gland; g, modified sweat gland ; 

 h, eyelashes ; t, post tarsal glands. 



the circulation is termi- 

 nal, and stagnation in the blood current is not difficult 

 to produce. Sycosis, an inflammation involving the 

 hair follicles and some of the glands at the edge of the 

 F 4 



