lactiferous duct

乳管

WordNet

1. a continuous tube formed by a row of elongated cells lacking intervening end walls
2. an enclosed conduit for a fluid
3. a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance; "the tear duct was obstructed"; "the alimentary canal"; "poison is released through a channel in the snakes fangs" (同)epithelial duct, canal, channel

PrepTutorEJDIC

1. 送水管;(建物・船などの)通気管;(地下ケーブルなどの)ダクト / (体液を運ぶ)導管,(植物が水・空気を運ぶ)導管

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/02/08 12:13:00」(JST)

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Lactiferous duct
The Breast: cross-section scheme of the mammary gland. 1. Chest wall 2. Pectoralis muscles 3. Lobules 4. Nipple 5. Areola 6. Milk duct 7. Fatty tissue 8. Skin
Latin	ductus lactiferi, tubulus lactiferi
Gray's	subject #271 1268

Lactiferous ducts form a tree branched system connecting the lobules of the mammary gland to the tip of the nipple. They are also referred to as galactophores, galactophorous ducts, mammary ducts, mamillary ducts and milk ducts. They are the structures which carry milk toward the nipple in a lactating female.

Anatomy

Lactiferous ducts are lined by a columnar epithelium supported by myoepithelial cells. When a woman is not lactating, the lactiferous duct is frequently blocked by a keratin plug. This plug prevents bacteria from entering the duct in non-lactating women. Prior to 2005, it was thought within the areola the lactiferous duct would dilate to form the lactiferous sinus in which milk supposedly accumulates between breastfeeding sessions. However new research suggests that lactiferous sinus does not exist.

Function

The columnar epithelium plays a key role in balancing milk production, milk stasis and resorption. The cells of the columnar epithelium form tight junctions which are regulated by hormones and local factors like pressure and casein content. Prolactin and/or placental lactogen are required for tight junction closure while progesterone is the main hormone preventing closure before birth.

Related diseases

The majority of breast diseases either originate from lactiferous ducts or are closely related. The high susceptibility to benign and malignant diseases is in part a consequence of the cycling hormonal growth stimulation resulting in a high cell turnover and accumulation of defects and complicated hormonal equilibrium which is highly sensible to disturbance.^{[citation needed]}

• most breast cancers arise from the ductal epithelium
• phyllodes tumor and intraductal papilloma of the breast
• mastalgia is frequently caused by an imbalance of breast secretion in the lobules and resorption in the ducts
• nonpuerperal mastitis is frequently caused by a similar mechanism in combination with an infection
• duct ectasia is similar and overlapping with the above mentioned
• subareolar abscess and squamous metaplasia of lactiferous ducts
• most forms of fibrocystic breast changes and cysts are thought to originate from lactiferous ducts

See also

• Lactation
• Breastfeeding

References

External links

• Lactiferous+duct at eMedicine Dictionary

UpToDate Contents

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• 1. 非哺乳期の乳腺炎 nonlactational mastitis
• 2. 陥没乳頭 nipple inversion
• 3. 原発性乳房膿瘍 primary breast abscess
• 4. 小児における先天性鼻涙管閉塞（涙管閉鎖症）および涙嚢ヘルニア congenital nasolacrimal duct obstruction dacryostenosis and dacryocystocele
• 5. 総胆管損傷の修復 repair of common bile duct injuries

English Journal

• Squamous metaplasia of lactiferous ducts (SMOLD).

• Lo G, Dessauvagie B, Sterrett G, Bourke AG.SourceDepartment of Radiology, Sir Charles Gairdner Hospital, Nedlands, Australia. glen.lo@health.wa.gov.au
• Clinical radiology.Clin Radiol.2012 Nov;67(11):e42-6. doi: 10.1016/j.crad.2012.07.011. Epub 2012 Sep 7.
• The aim of this review is to illustrate the mammographic and sonographic appearances of squamous metaplasia of the lactiferous ducts (SMOLD) and to discuss the disease processes of this uncommon breast disease, which shows a strong correlation with smoking. The most common mammographic appearance is
• PMID 22964367

• Microwave tomography analysis system for breast tumor detection.

• Kwon KC, Lim YT, Kim CH, Kim N, Park C, Yoo KH, Son SH, Jeon SI.SourceCollege of Electrical and Computer Engineering, Chungbuk National University, Chungbuk, South Korea.
• Journal of medical systems.J Med Syst.2012 Jun;36(3):1757-67. doi: 10.1007/s10916-010-9635-4. Epub 2011 Jan 6.
• In the breast-cancer image detection device field, remarkable advancements have been made in the breast cancer detection method using microwave radiation that satisfies the conditions required by Institute of Medicine (IOM). This paper is for embodying the microwave analysis breast tumor detection s
• PMID 21210189

Japanese Journal

• 乳房Paget病の5例

• 日本臨床外科学会雑誌 73(11), 2763-2767, 2012
• NAID 130004518154

• 乳頭部くりぬき円状部分切除術を施行した乳房Ｐａｇｅｔ病の４例

• 日本臨床外科学会雑誌 71(12), 3059-3063, 2010
• NAID 130004517489

• A high-resolution endoscope of small diameter using electromagnetically vibration of single fiber (特集 医療用MEMSデバイス)

• 電気学会論文誌. E, センサ・マイクロマシン準部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A publication of Sensors and Micromachines Society 129(11), 399-404, 2009-11-01
• NAID 10025533563

Related Links

• lactiferous duct - definition of lactiferous duct by Medical ...

lactiferous duct n. Any of the ducts that drain the lobes of the mammary gland at the nipple. Also called galactophore, galactophorous duct, mammary duct, mamillary duct, milk duct. lactiferous duct, one of many channels that ...

• Lactiferous duct | Define Lactiferous duct at Dictionary.com

lactiferous duct n. Any of the ducts that drain the lobes of the mammary gland at the nipple. Also called galactophore, galactophorous duct, mammary duct, mamillary duct, milk duct.

Related Pictures

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★リンクテーブル★

リンク元	「乳管」
関連記事	「duct」「lactiferous」

「乳管」

　　[★]

英

lactiferous duct, galactophorous duct, mammary duct

ラ

ductus lactiferi

関

乳房

「duct」

　　[★]

• n.

• 管、(植物)導管

関

canal、conduit、ductal、ductus、meatus、pipe、tubal、tube、vas、vessel

　 　 　 　

「lactiferous」

　　[★]

• adj.

• 乳汁分泌の

関

lactation