conjunctival sac

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Related to conjunctival sac: tarsal plate, Tarsal glands


a baglike organ or structure; see also bag, pocket, and pouch.
air s's (alveolar s's) the spaces into which the alveolar ducts open distally, and with which the alveoli communicate; see also lung.
amniotic sac the sac formed by the amnion, enclosing the fetus suspended in amniotic fluid; popularly known as the bag of waters.
conjunctival sac the potential space, lined by conjunctiva, between the eyelids and the eyeball.
endolymphatic sac the blind, flattened cerebral end of the endolymphatic duct.
hernial sac the peritoneal pouch that encloses protruding intestine.
lacrimal sac the dilated upper end of the nasolacrimal duct; see also lacrimal apparatus.
yolk sac the extraembryonic membrane connected with the midgut; in vertebrates below true mammals, it contains a yolk mass.
Yolk sac in a developing embryo. From Applegate, 2000.

con·junc·ti·val sac

the space bound by the conjunctival membrane between the palpebral and bulbar conjunctiva, into which the lacrimal fluid is secreted; it is a closed space when eye is closed; when eye is open, the sac is open anteriorly through the palpebral fissure (between the eyelids).
Synonym(s): saccus conjunctivalis [TA]

conjunctival sac

Etymology: L, conjunctivus, connecting; Gk, sakkos
the potential space enclosed by the conjunctiva and the eyelids.

con·junc·ti·val sac

(kŏn-jŭngk'tī'val sak) [TA]
The space bound by the conjunctival membrane between the palpebral and bulbar conjunctivae, into which the lacrimal fluid is secreted; it opens anteriorly between the eyelids.
Synonym(s): saccus conjunctivalis [TA] .


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.


pertaining to or emanating from conjunctiva.

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.
References in periodicals archive ?
8) Although birds in our study did have increased movement of the nictitating membrane, we placed the thread into the lower conjunctival sac at the junction of the middle and lateral third of the lower eyelid without problems.
Most of the females were from middle and lower income group working with wood and dried cow dung for cooking, which gives away lot of smoke particles, which settle down in conjunctival sac and enter nasolacrimal duct through tears and block nasolacrimal duct.
The gland was totally embedded in conjunctival sac.
Ocular surface protections was added, such as artificial tears without preservatives, dextran 70 eye drops (qid), deproteinized calf blood extract eye gel (bid), and sodium chloride conjunctival sac wash (bid).
The TBUT test was performed using fluorescein strips (Fluorets strips by Chauvin Pharmaceuticals Ltd), which were introduced to the conjunctival sac with minimal stimulation.
STT was performed by inserting a standard sterile STT strip over the ventral lid margin into the ventral conjunctival sac for 60 seconds.
TFBUT is the time period between a last blink and appearance of first dry spot after instilling one drop of fluorescein in conjunctival sac seen by slit lamp.
These worms live in conjunctival sac of eye in many species of affected livestock.
The Schirmer test was done by using a strip of filter paper 35 mm long and 5 mm wide which was bent at one end and placed in the lower conjunctival sac about one-third of the palpebral width from the temporal canthus, after one drop of topical anesthetic.
We compared the disease course in the house finch, American goldfinch (Carduelis tristis), and house sparrow (Passer domesticus) after inoculation into the conjunctival sac with M gallisepticum and also the degree to which the 3 species were infectious to other naive house finches.