内肛門括約筋
WordNet
- work as an intern; "The young doctor is interning at the Medical Center this year"
- an advanced student or graduate in medicine gaining supervised practical experience (`houseman is a British term) (同)interne, houseman, medical intern
- deprive of freedom; "During WW II, Japanese were interned in camps in the West"
- a ring of muscle that contracts to close an opening (同)anatomical sphincter, sphincter_muscle
- black tropical American cuckoo
PrepTutorEJDIC
- (特に戦時中)〈人・船など〉‘を'強制収容する,抑留する
- 括約筋(かつやくきん)
- (次にくる語の発音が母音で始まるときに用いる) / (子音[h]で始まり第1音節に強勢のない語の場合はanを用いることがある.ただし,この場合は[h]を発音しない)
- アニス酒(aniseedで味をつける)
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/08/16 08:33:47」(JST)
[Wiki en表示]
| Internal anal sphincter |
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Coronal section through the anal canal. B. Cavity of urinary bladder V.D. Vas deferens. S.V. Seminal vesicle. R. Second part of rectum. A.C. Anal canal. L.A. Levator ani. I.S. Internal anal sphincter. E.S. External anal sphincter.
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Coronal section of rectum and anal canal.
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| Details |
| Nerve |
Pelvic splanchnic nerves (S4), thoracicolumbar outflow of the spinal cord |
| Actions |
Keeps the anal canal and orifice closed, aids in the expulsion of the feces |
| Identifiers |
| Latin |
Musculus sphincter ani internus |
Dorlands
/Elsevier |
m_22/12550809 |
| TA |
A05.7.05.011 |
| FMA |
15710 |
| Anatomical terms of muscle
[edit on Wikidata]
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The internal anal sphincter, IAS, (or sphincter ani internus) is a muscular ring that surrounds about 2.5–4.0 cm of the anal canal; its inferior border is in contact with, but quite separate from, the external anal sphincter.
It is about 5 mm thick, and is formed by an aggregation of the involuntary circular fibers of the rectum. Its lower border is about 6 mm from the orifice of the anus.
Contents
- 1 Actions
- 2 Role in continence
- 3 Additional images
- 4 References
- 5 External links
Actions
Its action is entirely involuntary, and it is in a state of continuous maximal contraction. It helps the Sphincter ani externus to occlude the anal aperture and aids in the expulsion of the feces. Sympathetic fibers from the superior rectal and hypogastric plexuses stimulate and maintain internal anal sphincter contraction. Its contraction is inhibited by parasympathetic fiber stimulation. This sphincter is tonically contracted most of the time to prevent leakage of fluid or gas, but is relaxed upon distention of the rectal ampulla, requiring voluntary contraction of the puborectalis and external anal sphincter.[1] The internal anal sphincter is not innervated by the pudendal nerve, which carries somatic (motor and sensory) fibers that provide the innervation to the external anal sphincter.[2]
Role in continence
The IAS contributes 55% of the resting pressure of the anal canal. It is very important for bowel continence, especially for liquid and gas. When the rectum fills beyond a certain capacity, the rectal walls are distended, triggering the defecation cycle. This begins with the rectoanal inhibitory reflex, RAIR, where the IAS relaxes. This is thought to allow a small amount of rectal contents to descend into the anal canal where specialized mucosa samples whether it is gas, liquid or solid. Problems with the IAS often present as degrees of fecal incontinence (especially partial incontinence to liquid) or mucous rectal discharge.[3]
Additional images
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Schematic demonstrating the anatomy of hemorrhoids.
References
This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
- ^ Moore, K., Dalley, A., Ague, A. "Clinically Oriented Anatomy. 6th Edition.
- ^ http://www.dartmouth.edu/~humananatomy/part_6/chapter_36.html
- ^ David E. Beck, Patricia L. Roberts, Theodore J. Saclarides, Anthony J. Senagore, Michael J. Stamos, Steven D. Wexner (Editors) (2007). The ASCRS textbook of colon and rectal surgery. New York: Springer. ISBN 0-387-24846-3.
External links
- Pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (Rectum)
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Muscles of perineum
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| Perineum |
| Anal triangle |
| sphincter ani |
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- Ischioanal fossa
- Pudendal canal
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| Middle |
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| Urogenital triangle |
| superficial perineal pouch |
- superficial transverse perineal
- bulbospongiosus
- ischiocavernosus
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| deep perineal pouch |
- deep transverse perineal
- sphincter urethrae membranaceae
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| Fascia |
| Superficial perineal fascia |
- Colles' fascia
- (in scrotum and penis: Dartos)
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| Deep perineal fascia |
- Deep perineal fascia / superficial investing fascia (Gallaudet's)
- (in penis: Deep fascia of the penis (Buck's))
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| Urogenital diaphragm |
- Inferior fascia (Perineal membrane)
- Superior fascia
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| Pelvic diaphragm |
- Inferior fascia
- Superior fascia
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Anatomy of the gastrointestinal tract, excluding the mouth
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| Upper |
| Pharynx |
- Muscles
- Spaces
- peripharyngeal
- retropharyngeal
- parapharyngeal
- retrovisceral
- danger
- prevertebral
- Pterygomandibular raphe
- Pharyngeal raphe
- Buccopharyngeal fascia
- Pharyngobasilar fascia
- Piriform sinus
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| Esophagus |
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| Stomach |
- Curvatures
- greater
- lesser
- Angular incisure
- Cardia
- Body
- Fundus
- Pylorus
- Gastric mucosa
- Gastric folds
- Microanatomy
- Gastric pits
- Gastric glands
- Cardiac glands
- Fundic glands
- Pyloric glands
- Foveolar cell
- Parietal cell
- Gastric chief cell
- Enterochromaffin-like cell
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| Lower |
| Small intestine |
| Microanatomy |
- Intestinal villus
- Intestinal gland
- Enterocyte
- Enteroendocrine cell
- Goblet cell
- Paneth cell
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| Duodenum |
- Suspensory muscle
- Major duodenal papilla
- Minor duodenal papilla
- Duodenojejunal flexure
- Brunner's glands
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| Jejunum |
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| Ileum |
- Ileocecal valve
- Peyer's patches
- Microfold cell
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| Large |
| Cecum |
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| Colon |
- Ascending colon
- Hepatic flexure
- Transverse colon
- Splenic flexure
- Descending colon
- Sigmoid colon
- Continuous
- taenia coli
- haustra
- epiploic appendix
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| Rectum |
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| Anal canal |
- Anus
- Anal columns
- Anal valves
- Anal sinuses
- Pectinate line
- Internal anal sphincter
- Intersphincteric groove
- External anal sphincter
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| Wall |
- Serosa / Adventitia
- Subserosa
- Muscular layer
- Submucosa
- Circular folds
- Mucosa
- Muscularis mucosa
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UpToDate Contents
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- 1. 女性泌尿生殖器の外科解剖学surgical female urogenital anatomy [show details]
… obturator internus and piriformis are the muscles of the pelvic sidewalls The skeletal muscles of the pelvic floor include the levator ani muscles, the coccygeus muscle, the external anal sphincter, the …
- 2. 肛門括約筋断裂の待機手術によるマネージメントdelayed surgical management of the disrupted anal sphincter [show details]
… especially when injury involves the levator ani musculature or the upper and mid-anal canal, as seen with vacuum and forceps delivery . Chronic anterior anal sphincter defects can occur along the entire length …
- 3. 肛門直腸瘻の外科的マネージメントoperative management of anorectal fistulas [show details]
… the middle portion of the external sphincter and the coccyx. Just above this is the raphe of the levator ani muscle,… the obturator internus muscle laterally, and the inferior surface of the levator ani as its anterior and medial border.…
- 4. 女性の骨盤底障害診断に行うエコー検査ultrasound examination of the female pelvic floor [show details]
…levator ani detachment, vaginal synthetic mesh complications, obstetric anal sphincter injury (OASIS), accidental bowel leakage, and voiding dysfunction. Levator ani detachment – While levator ani injury …
- 5. 成人における便失禁：疫学および評価fecal incontinence in adults etiology and evaluation [show details]
… Dysfunction of the levator ani muscle appears to have a strong association with the severity of incontinence . Loss of continence can result from dysfunction of the anal sphincters, abnormal rectal compliance …
English Journal
- Anal sphincter dysfunction in patients treated with primary radiotherapy for anal cancer: a study with the functional lumen imaging probe.
- Haas S1,2, Faaborg P2,3, Liao D4, Laurberg S1,2, Gregersen H5, Lundby L1,2, Christensen P1,2, Krogh K2,6.
- Acta oncologica (Stockholm, Sweden).Acta Oncol.2018 Apr;57(4):465-472. doi: 10.1080/0284186X.2018.1438658. Epub 2018 Feb 15.
- PMID 29447025
- Laparoscopic-Assisted Modified Intersphincter Resection for Ultralow Rectal Cancer.
- Zhou H1, Ruan C2, Wang Z1, Hu Z3.
- Annals of surgical oncology.Ann Surg Oncol.2018 Apr;25(4):947-948. doi: 10.1245/s10434-017-6280-x. Epub 2018 Jan 16.
- PMID 29340993
- HPV genotypes detected by linear array and next-generation sequencing in anal samples from HIV positive men who have sex with men in Mexico.
- González-Hernández LA1, Flores-Miramontes MG2, Aguilar-Lemarroy A2, Quintanilla-Peña KS1, Martin-Amaya-Barajas FL2, Ramos-Solano M1, Enciso Gómez LF3, Andrade-Villanueva JF4, Jave-Suárez LF5.
- Archives of virology.Arch Virol.2018 Apr;163(4):925-935. doi: 10.1007/s00705-017-3697-2. Epub 2018 Jan 3.
- PMID 29299683
Related Links
- 1 Definition Der Musculus sphincter ani internus ist ein ringförmig um den Anus angeordneter, glatter Muskel, der den unwillkürlichen Abgang von Stuhl verhindert. 2 Anatomie Der Musculus sphincter ani internus entsteht ...
- 1 Definition Der Musculus sphincter ani externus ist ein ringförmig um den Anus angeordneter, quergestreifter Muskel, der den Anus verschließt. Seine Fasern verlaufen schlingenförmig. 2 Einteilung Man unterscheidet 3 Teile des ...
★リンクテーブル★
[★]
- 英
- internal anal sphincter (M,K), internal sphincter muscle of anus
- ラ
- musculus sphincter ani internus
- 関
- 肛門括約筋、肛門
[★]
乳児自己免疫性好中球減少症 autoimmune neutropenia of infancy
[★]
括約筋
- 関
- sphincter muscle、sphincteral
[★]
[★]
- 関
- anal、anus