conjunctival sac

sac (sak) a pouch or bag.

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air sacs  alveolar s's.

allantoic sac  the dilated portion of the allantois, becoming a part of the placenta in many mammals; it becomes the urachus in humans.

alveolar sacs  the spaces into which the alveolar ducts open distally, and with which the alveoli communicate.

Alveolar sacs (sacculi alveolares).

amniotic sac  that formed by the amnion, containing the amniotic fluid.

chorionic sac  that formed by the vertebrate chorion, surrounding the embryo, amniotic cavity, and amniotic sac and contributing to the fetal part of the placenta.

conjunctival sac  the potential space, lined by conjunctiva, between the eyelids and eyeball.

dental sac  the dense fibrous layer of mesenchyme surrounding the enamel organ and dental papilla.

endolymphatic sac  the blind, flattened cerebral end of the endolymphatic duct.

gestational sac  that comprising the extraembryonic membranes that envelop the embryo or fetus; in humans, that formed by the fused amnion and chorion.

heart sac  pericardium.

hernial sac  the peritoneal pouch enclosing a hernia.

Hilton's sac  laryngeal saccule.

lacrimal sac  the dilated upper end of the nasolacrimal duct.

yolk sac  the extraembryonic membrane that connects with the midgut; at the end of the fourth week of development it expands into a pear-shaped vesicle (umbilical vesicle) connected to the body of the embryo by a long narrow tube (yolk stalk) . In mammals, it produces a complete vitelline circulation in the early embryo and then undergoes regression.

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conjunctival sac

n.

The space bound by the conjunctival membrane between the palpebral and bulbar conjunctiva of the eye.

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conjunctival sac

Etymology: L, conjunctivus, connecting; Gk, sakkos

the potential space enclosed by the conjunctiva and the eyelids.

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conjunctival

pertaining to or emanating from conjunctiva.

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congenital conjunctival membrane

partial or complete obstruction of the lacrimal puncta occurs when a conjunctival membrane or flap is present over the opening.

conjunctival flap

surgical movement and fixation of conjunctiva, either bulbar or palpebral, to cover defects in conjunctiva or, more commonly, to cover lacerations or nonhealing, progressive or deep ulcerations of the cornea especially those with desmetoceles. The flaps serve to protect the corneal lesion from eyelid trauma and encourage migration and proliferation of fibroblasts and blood vessels into the area. There are many techniques; some utilize the nictitating membrane.

conjunctival grafts

defects of conjunctiva may be grafted with conjunctiva obtained from elsewhere in the same eye or the opposite eye. Buccal mucosa has also been used for this purpose.

conjunctival granuloma

see nodular fasciitis.

conjunctival sac

the tear-filled space, lined by conjunctiva, between the eyelids and the eyeball.

conjunctival squamous metaplasia

cancer eye. See ocular squamous cell carcinoma.

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conjunctiva 

A thin transparent mucous membrane lining the posterior surface of the eyelids from the eyelid margin and reflected forward onto the anterior part of the eyeball where it merges with the corneal epithelium at the limbus. It thus forms a sac, the conjunctival sac, which is open at the palpebral fissure and closed when the eyes are shut. The depths of the unextended sac are 14-16 mm superiorly and 9-11 mm inferiorly. The conjunctiva is divided into three portions: (1) The portion that lines the posterior surface of the eyelids is called the palpebral conjunctiva. It is itself composed of the marginal conjunctiva, which extends from the eyelid margin to the tarsal conjunctiva; the tarsal conjunctiva, which extends from the marginal conjunctiva to the orbital conjunctiva; and the orbital conjunctiva, which extends from the tarsal conjunctiva to the fornix. (2) That lining the eyeball is the bulbar conjunctiva. It is itself composed of the limbal conjunctiva, which is fused with the episclera at the limbus and the scleral conjunctiva, which extends from the limbal conjunctiva to the fornix. (3) The intermediate part forming the bottom of the conjunctival sac, unattached to the eyelids or the eyeball and joining the bulbar and the palpebral portion is called the fornix (conjunctival fold, cul-de-sac). See dyskeratosis; lid eversion; conjunctival gland; Krause's end bulbs; subtarsal sulcus.