canaliculi


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Related to canaliculi: Haversian system, Lacrimal canaliculi

canaliculus

 [kan″ah-lik´u-lus] (pl. canali´culi) (L.)
an extremely narrow tubular passage or channel. adj., adj canalic´ular.
bile canaliculi fine tubular channels forming a three-dimensional network within the parenchyma of the liver. They join to form the bile ductules and eventually the hepatic duct.
bone canaliculi branching tubular passages radiating like wheel spokes from each bone lacuna to connect with the canaliculi of adjacent lacunae, and with the haversian canal.
lacrimal canaliculus the short passage in an eyelid, beginning at the lacrimal point and draining tears from the lacrimal lake to the lacrimal sac; called also lacrimal duct. See also lacrimal apparatus.
mastoid canaliculus a small channel in the temporal bone transmitting the auricular branch of the vagus nerve.

can·a·lic·u·li

(kan-ă-lik'yū-lī),
Plural of canaliculus.

can·a·lic·u·li

(kan'ă-lik'yū-lī)
Plural of canaliculus.

canaliculi

fine channels, e.g. those which occur in bone.

Canaliculi

Also known as lacrimal ducts, these tube-like structures carry the tears from the eyes to the lacrimal sac.
Mentioned in: Dacryocystitis

lacrimal apparatus

The system involved in the production and conduction of tears. It consists of the lacrimal gland and accessory lacrimal glands (glands of Krause and Wolfring); the eyelid margins; and the two puncta lacrimae. Each punctum is a small round or oval aperture situated on a slight elevation at the inner end of the upper and lower lid margin (lacrimal papilla) and forms the entrance to the canaliculi. Each canaliculus consists of a vertical portion of about

lacrimal apparatus

The system involved in the production and conduction of tears. It consists of the lacrimal gland and accessory lacrimal glands (glands of Krause and Wolfring); the eyelid margins; and the two puncta lacrimae. Each punctum is a small round or oval aperture situated on a slight elevation at the inner end of the upper and lower lid margin (lacrimal papilla) and forms the entrance to the canaliculi. Each canaliculus consists of a vertical portion of about 2 mm long and then bends inward for some 8 mm, the upper one being slightly shorter. The canaliculi pierce the lacrimal fascia (i.e. the periorbita covering the lacrimal sac or tear sac) and unite (forming the common canaliculus) to enter a small diverticulum of the sac called the sinus of Maier. The lacrimal sac is closed above and open below where it is continuous with the nasolacrimal duct which extends over some 1.5 cm in length to Hasner's valve (or Bianchi's valve or plica lacrimalis) (folds of mucous membrane) at the inferior meatus of the nose. The inferior opening of the duct is called the ostium lacrimale (Fig. L1). See dacryocystitis; epiphora; lacrimal fistula; fossa for the lacrimal sac; Sjögren's syndrome; tear duct; dye dilution test; Jones II test; valve of Krause.
Fig. L1 Lacrimal apparatusenlarge picture
Fig. L1 Lacrimal apparatus
References in periodicals archive ?
Thus, it could be suggested that besides the presence of the adhesive in the canaliculi, the release of these toxic substances may have contributed to the irritability potential to sensitive individuals resulting in greater tearing.
Thus, two periods are distinguished: (1) the Gd-BOPTA perfusion period that evidences how the contrast accumulates in the liver compartments, and (2) the Gd-BOPTA rinse period that investigates how the contrast leaves hepatocytes into bile canaliculi and back into sinusoids.
Dacryocystorhinostomy is indicated when the nasolacrimal duct is partially or totally obstructed and the canaliculi are patent.
If patients with complaints of recurrent unilateral epiphora and discharge were started on topical antibiotics for conjunctivitis but their signs and symptoms return after a brief period of improvement, as occurred with our patients, a more careful examination of the canaliculi should be done with canaliculitis in mind for the differential diagnosis.
Bile produced by hepatocytes drains first into bile canaliculi, which thus represent the smallest pathway of bile flow, but these are not readily visible on an H&E stain.
The pathophysiology of cholestasis in CAH is unclear, but a lack of glucocorticoid may result in decreased bile secretion into the canaliculi.5,10,11 Research based on animal models suggests that Cortisol influences bile formation, furthermore bile flow was reduced in adrenalectomized rats.
Once conjugated, bilirubin is actively transported out of the liver cells and into the bile canaliculi. This involves the action of a transporter molecule called the multiple drug resistant protein-2.
Conjunctivoralostomy is a surgical technique for treatment of chronic epiphora due to an obstructed lacrimal canaliculi. The present paper reports a chronic case of epiphora and its surgical management by conjunctivoralostomy.
A scar near the area of the medial canthus, may point to previous trauma which may have involved the canaliculi. A stenosis (narrowing) may have developed, causing an outflow problem.
The nasolacrimal apparatus arises embryologically from a cord of surface ectoderm that invaginates between the maxillary and frontonasal processes, giving rise to the canaliculi proximally and the lacrimal sac and nasolacrimal duct distally.
They can obstruct the canaliculi, causing epiphora, or incite inflammation and possibly infection, causing canaliculitis or dacryocystitis.
Natural cavities such as lacunae, canaliculi and haversian canals can also possibly initiate cracks when bone is subjected to high strain rates (2).