444 CONJUNCTIVA AND SCLEROTIC. 



containing longitudinal bands of smooth muscular fibres. In- 

 ternally it is lined by a layer of cells which are a continuation 

 of the rete Malpighii ; somewhat deeper they are replaced by 

 columnar cells, which in the new-born child extend to the 

 fund us, but in the adult are exchanged, in the deepest portion 

 of the tube lying in the looser layer of the subcutaneous 

 connective tissue, for cubic cells. They sometimes contain a 

 yellowish-brown pigment. Near the external orifice the canal 

 becomes contracted, and usually opens like a funnel into the 

 follicle of a cilium, though sometimes separately. The cells 

 lining the tube pass gradually into those of the epidermis. 

 This peculiar variety of the sudoriparous glands was first 

 described by Moll* 



The connective-tissue fasciculi of the deeper loose layer of the 

 subcutaneous tissue form, by decussation with the connective- 

 tissue trabeculse of the corresponding layer of the submucous 

 tissue, a plexiform tissue, situated about the middle of the 

 thickness of the lids, in the meshes of which the fasciculi 

 of the musculus sphincter orbicularis, which run parallel to 

 the margin of the lid, are imbedded. These are arranged one 

 above the other, and extend from the orbital margin towards 

 the free border of the lid in such fashion that the uppermost 

 fasciculi of the lower eyelid and the lowermost of the upper 

 eyelid are situated between the root of the most anterior cilia 

 and the skin covering the anterior surface of the lid. 



A few fibres are given off from the innermost fasciculi, 

 which partly penetrate between the cilia, and partly run 

 towards the anterior border of the. lid. 



Besides this muscle, the lid contains also the transversely 

 striated ciliaris Riolani. This almost always consists of two por- 

 tions, which both run parallel, and close to the margin of the lid. 



The larger portion of this really a large fasciculus lies 

 between the hindermost cilia and the excretory ducts of the 

 Meibomian glands, whilst the smaller portion, consisting of from 

 three to five small fasciculi, is imbedded close to the posterior 

 border of the lid, between the mucosa of the conjunctiva and 

 the neck of the excretory duct of the Meibomian glands. 



* Bydragen tot de not. der oagleden. Utrecht, 1857. 



