Textbook of normal histology: including an account of the development of the tissues and of the organs . mall sebaceous glands. The life of the cilia is short,being about four months in duration ; as a result, hairs in all stagesof growth are usually included among the eyelashes. The muscular bundles of the orbicularis palpebrarum constitutethe layer next the subcutaneous tissue. At the lower margin of thelid the muscle-bundles are divided by the outer structures occupyingthis region ; an especially robust bundle separated by the lashes liesnear the posterior margin of the lid-edge and constit
Textbook of normal histology: including an account of the development of the tissues and of the organs . mall sebaceous glands. The life of the cilia is short,being about four months in duration ; as a result, hairs in all stagesof growth are usually included among the eyelashes. The muscular bundles of the orbicularis palpebrarum constitutethe layer next the subcutaneous tissue. At the lower margin of thelid the muscle-bundles are divided by the outer structures occupyingthis region ; an especially robust bundle separated by the lashes liesnear the posterior margin of the lid-edge and constitutes the ciliaryor marginal muscle of the lid. The succeeding connective-tissue layer is composed largely ofthe fibrous extensions of the tendon of the levator palpebrae,which are partly inserted into the areolar tissue—fascia palpe- ^68 NORMAL HISTOLOGY. bralis—and partly attached to the upper edge of the tarsus; thetarsal portion contains bundles of non-striped muscle, which col-lectively form the lid-muscle of Miiller. The tarsus consists of a semilunar plate of dense fibrous tissue Fig. Section of human eyelid: a, a, skin; b, subcutaneous tissue; c, cilium ; d, medianconnective tissue; e, tarsal plate containing Meibomian glands {h)\f, tunica propriaof conjunctiva covered by its epithelium (g); i, duct of Meibomian glands; j, Mollsglands; m, »i, cut fibres of orbicular muscle ; m, marginal bundle of same; n, sectionsof sweat-glands ; o, hairs ; /, anterior boundary of tarsus. lying immediately in front of the conjunctiva, and extending as afirm but elastic lamina from the sharply-defined palpebral borderdeeply into the substance of the lid. The tarsus is composed ofclosely-felted bundles of dense fibrous tissue, whose tough THE EYE AND ITS APPENDAGES. 360 resistant mass gives form and support to the softer tissues of the lidsand partly covers the Meibomian glands embedded within its sub-stance. The Meibomian or tarsal glands constitute a series of aboutthirty elo
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Keywords: ., bookauthorpiersolgeorgeageorgea, bookcentury1800, bookdecade1890
