WordNet

relating to or located near the organ that produces tears (同)lachrymal
of or relating to tears (同)lachrymal

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=lachrymal / 涙腺(るいせん)の近くにある

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/08/30 16:55:04」(JST)

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The lacrimal sac or lachrymal sac^[1] is the upper dilated end of the nasolacrimal duct, and is lodged in a deep groove formed by the lacrimal bone and frontal process of the maxilla. It connects the lacrimal canaliculi, which drain tears from the eye's surface, and the nasolacrimal duct, which conveys this fluid into the nasal cavity.

Structure

It is oval in form and measures from 12 to 15 mm. in length; its upper end is closed and rounded; its lower is continued into the nasolacrimal duct.

Its superficial surface is covered by a fibrous expansion derived from the medial palpebral ligament, and its deep surface is crossed by the lacrimal part of the Orbicularis oculi, which is attached to the crest on the lacrimal bone.

Histology

Like the nasolacrimal duct, the sac is lined by stratified columnar epithelium with mucus-secreting goblet cells, with surrounding connective tissue. The Lacrimal Sac also drains the eye of any debris, bacteria, dirt, etc.

Function

This is mainly for high amounts of tears, in which the lacrimal sac pumps inward and outward driven by the orbicularis muscle during blinking.

Clinical significance

The lacrimal sac can be pictured by dacrocystography, which is injecting radiocontrast into it and performing X-ray imaging of it.

Additional images

Medial wall of left orbit.
Left orbicularis oculi, seen from behind.
The lacrimal apparatus. Right side. (Lacrimal sac visible at upper right.)
The tarsi and their ligaments. Right eye; front view. (Lacrimal sac visible at middle right.)

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

^ Dr. Johannes Sobotta (1909). Sobotta's Atlas and Textbook of Human Anatomy. Philadelphia.

English Journal

[Minimally invasive endoscopic surgery of the lacrimal drainage system--two case reports].

Küstner M1, Clemens S, Tost F.
Klinische Monatsblätter für Augenheilkunde.Klin Monbl Augenheilkd.2005 Nov;222(11):928-32.
BACKGROUND: Dacryoendoscopy is a standard procedure to directly evaluate the lacrimal system. The existence and localisation of dacryostenosis and mucosal changes as well as rare diseases in the drainage system, such as intracanalicular foreign bodies or dacryoliths, can be reliably detected and tre
PMID 16308829

Endonasal microscopic dacryocystorhinostomy: results and advantages.

Dzhambazov KB1.
Folia medica.Folia Med (Plovdiv).2000;42(2):51-6.
BACKGROUND: The modern endonasal operative technique of functional fenestration of saccus lacrimalis in the middle nasal meatus (endonasal dacryocystorhinostomy), first described by West in 1910, has been gaining in significance over the past few years. At the VI National Congress of Otorhinolaryngo
PMID 11217286

[Malignant mucosal melanoma of the head and neck].

Slavícek A1, Astl J, Válková D, Betka J, Petruzelka L.
Sborník lékar̆ský.Sb Lek.2000;101(4):315-23.
Mucosal melanoma comparison to cutaneous melanoma of the head and neck are rare and do poorly. Approximately 0.5-2% of all melanomas occur from the mucous membranes of aerodigestive tract. Most common site of the tumor are the nasal cavity and paranasal sinuses but melanoma of the oral cavity are de
PMID 11702570

「涙嚢」

Lacrimal sac
	The lacrimal apparatusis shown through dissection on the left side.
	The lacrimal sac has been opened showing internal organization as well as the naso-lacrymal duct.
Details
Latin	saccus lacrimalis
Artery	angular artery
Identifiers
Gray's	p.1028
Dorlands; /Elsevier	s_01/12717293
TA	A15.2.07.068
FMA	20289
	Anatomical terminology