lid


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eye·lid

(ī'lid), [TA]
One of two movable folds that cover the front of the eyeball when closed; formed of a fibrous core (tarsal plate) and the palpebral portions of the orbicularis oculi muscle covered with skin on the superficial, anterior surface and lined with conjunctiva on the deep, posterior surface; rapid contraction of the contained muscle fibers produces blinking; each has fixed (orbital) and free margins, the latter separated centrally by the palpebral fissure, united at the lateral and medial palpebral commissures, and bearing eyelashes, openings of tarsal and ciliary glands and (medially) the lacrimal puncta.
Synonym(s): palpebra [TA], blepharon, lid

lid

(lĭd)
n.
1. An eyelid.
2. Biology A flaplike covering, such as an operculum.

lid

See eyelid.

eye·lid

(ī'lid) [TA]
One of the two movable folds covering the front of the eyeball when closed; formed of a fibrous core (tarsal plate) and the palpebral portions of the orbicularis oculi muscle covered with skin on the superficial, anterior surface and lined with conjunctiva on the deep, posterior surface; rapid contraction of the contained muscle fibers produces blinking; they each have fixed (orbital) and free margins, the latter separated centrally by the palpebral fissure, united at the lateral and medial palpebral commissures, and bearing eyelashes, the openings of tarsal and ciliary glands and (medially) the lacrimal puncta.
Synonym(s): palpebra [TA] , blepharon, lid.

eyelids

A pair of movable folds of skin which act as protective coverings of the eye. The upper eyelid extends downward from the eyebrow and is the more moveable of the two. When the eye is open and looking straight ahead, it just covers the upper part of the cornea; when it is closed, it covers the whole cornea. The lower eyelid reaches just below the cornea when the eye is open and rises only slightly when it shuts. Each eyelid consists of the following layers, starting anteriorly: (1) skin, (2) a layer of subcutaneous connective tissue, (3) a layer of striated muscle fibres of the orbicularis muscle, (4) a layer of submuscular connective tissue, (5) a fibrous layer, including the tarsal plates, (6) a layer of smooth muscle, (7) the palpebral conjunctiva. Syn. blephara; lids; palpebrae. See ablephary; blepharitis; ciliosis; ectropion; entropion; epicanthus; lid eversion; eyelid lamella; lagophthalmos; palpebral ligament; myokymia; orbital septum; phthiriasis; Cogan's lid twitch sign; Collier's sign; Dalrymple's sign; inferior palpebral sulcus; superior palpebral sulcus; tarsorrhaphy; tarsus; xanthelasma.
eyelids lamella The eyelid is sometimes conceptualized as consisting of an anterior and a posterior lamella. The anterior lamella consists of the skin, the layer of subcutaneous connective tissue and the layer of striated muscle fibres of the orbicularis muscle. The posterior lamella consists of the tarsal plates, a layer of smooth muscle (Müller's palpebral muscle), and the palpebral conjunctiva.
eyelids retractor muscles The eyelid muscles that open the palpebral aperture. The upper eyelid is elevated by the levator palpebrae superioris muscle and the superior tarsal muscle (of Müller) and the lower eyelid is depressed by the inferior tarsal muscle (of Müller).

lid

see eyelid.
References in classic literature ?
Jacob, finding the lid rather tight, gave the box to his brother in perfect faith.
David screwed on the lid, while Jacob, looking grave, rose and grasped his pitchfork.
I was disporting myself on the lid of the trunk at the time.
There we stood and shrieked with laughter over the gems that were ours, which had been found for /us/ thousands of years ago by the patient delvers in the great hole yonder, and stored for /us/ by Solomon's long-dead overseer, whose name, perchance, was written in the characters stamped on the faded wax that yet adhered to the lids of the chest.
Thus adjured, we set to work to pull up the stone lids on the other two, first--not without a feeling of sacrilege--breaking the seals that fastened them.
Mercedes dropped the lid and shrugged her shoulders.
Glegg had lifted out the parchments, and had fortunately drawn back a little, when the iron holder gave way, and the heavy lid fell with a loud bang that resounded over the house.
Sometimes the sun, shining through the clouds, made her blink her lids, when she gazed at the sails in the distance, and let her eyes roam over the horizon from the chateau of Tancarville to the lighthouses of Havre.
She looked up at him languidly, as though her lids were weighted with sleep and it cost her an effort to raise them.
When, with closed eyes, she commenced to speculate upon the future, and terrifying fears were conjured by a vivid imagination, she had but to raise her lids and look upon that noble face so close to hers to dissipate the last remnant of apprehension.
And beneath the brows, planted under his lids, was the merciless "$3.
The displaced lids and open doors showed heaps of sullen grey ashes.