Till-: ATA7.//AS 



L045 



bundle of orbicularis fibres, culled the musculus ciliaris Riolani, is found near 

 the edge of I lie lid, in front of and Ix'hind I he efferent ducts of the tarsal glands. 



A central connective tissue separates the orbiculuris muscle from the tarsus 

 in the tarsal division of the li<ls. In the ii|>i>er lid this is to be regarded as mainly 

 the anterior or fibrous expansion of the tendon of the levator pal|>cbne, which 

 .-ends connective-tissue septa between the bundles of the overlying orbicularis (as 

 just mentioned) going to the skin. In the orbital part of this lid the central con- 

 nective tissue includes'also the palpebral fascia, lying here immediately beneath the 

 orbiculuris muscle; but this soon thins off and fades into the more deeply placed 

 levator expansion. This latter is strengthened by an extension of the sheath of 

 the superior rectus, by which this muscle is enabled to influence the elevation of 

 the lid indirectly. In the lower lid the central connective tissue similarly consists 



Fio. 743. VERTICAL TRANSVERSE SECTION THROUGH THE UPPER EYELID. 

 (After \Valdcyer and Fuchs.) 



Cutaneous surface just above 

 superior palpebral fold 



Orbioularis fibres, out aoross 



SWEAT-GLANO 



FINE HAIR WITH SEBACEOUS GLAND 

 AT ITS BASE 



Orbicularis fibres, out aor 



CILIARY GLAND Of MOLL 

 CILIUM 



CONJUNCTIVA NEAR FORNIX 



Anterior layer of insertion 

 of levator palpebrac su- 

 perioils 



Superior tarsal .. 



muscle of Muller 



Fibres from levalor pass- 

 ing through orbloularis 

 to Bkiu 



Superior vtiicular arch, cut 

 across 



MUCOUS GLANDS 



Conjunettval papilla? over 

 attached border of tarsus 



Musculus elliarls Riolani 



Posterior edge of lid- 

 margin 



OPENING OF DUCT OF TARSAL 

 GLAND 



of palpebral fascia, blended with a thin fibrous extension of the sheath of the inferior 

 rectus. Immediately in front of each tarsus is a little loose connective tissue, which 

 contains the large blood-vessels and nerves of the lids. 



The tarsus of each lid is a stiff plate of close connective tissue, with its sur- 

 faces directed anteriorly and posteriorly: in its substance the tarsal glands are 

 embedded. One tarsal border is free, viz.. towards the edge of the lid. the other 

 is attached; the former is straight, while the latter is convex, especially in the 

 upper lid. The length of each tarsus is about twenty millimetres. Its breadth 

 is iri-eatest in the middle of the lid. and bt "adually smaller towards each 



canthus. where the tarsi are joined to the outer and inner palpebral ligaments. The 

 breadth of the upper tarsus (10 mm.) is about twice that of the lower. The thick- 

 ness of each is greatest, and its texture closest, at the middle of its length, thin- 



