WordNet

of or characteristic of low rank or importance
one of lesser rank or station or quality
having an orbit between the sun and the Earths orbit; "Mercury and Venus are inferior planets"
lower than a given reference point; "inferior alveolar artery"
of low or inferior quality
of or relating to or located in a mesentery

PrepTutorEJDIC

(階級・親分・質・程度などが)『下の』,『劣る』, / (位置が)低い,下方の / 目下の者;劣った人

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/07/18 15:34:43」(JST)

wiki en

In human anatomy, the inferior mesenteric artery, often abbreviated as IMA, supplies the large intestine from the left colic (or splenic) flexure to the upper part of the rectum, which includes the descending colon, the sigmoid colon, and part of the rectum. Proximally, its territory of distribution overlaps (forms a watershed) with the middle colic artery, and therefore the superior mesenteric artery. The SMA and IMA anastomose via the marginal artery of the colon (artery of Drummond) and via Riolan's arcade (a connection between the left colic artery and the medial colic artery). The territory of distribution of the IMA is more or less equivalent to the embryonic hindgut.

Branching[edit]

The IMA branches off the anterior surface of the abdominal aorta below the renal artery branch points, and approximately midway between these and the aortic bifurcation (into the common iliac arteries), L3 vertebral level.

The IMA has the following branches:

Branch	notes
left colic artery	supplies descending colon
sigmoid branches	the most superior being described as 'the superior sigmoid artery'
superior rectal artery	effectively the terminal branch of the IMA (the continuation of the IMA after all other branches)

All these arterial branches further divide into arcades which then supply the colon at regular intervals.

Associated veins[edit]

The IMA is accompanied along its course by a similarly named vein, the inferior mesenteric vein, which drains into the splenic vein.

The IMV therefore drains to the portal vein and does not fully mirror the course of the IMA.

Surgery and pathology[edit]

The IMA and/or its branches must be resected for a left hemicolectomy.

A horseshoe kidney, a common (1 in 500) anomaly of the kidneys, will be positioned below the IMA.

Additional images[edit]

The abdominal aorta and its branches.
The inferior mesenteric artery and its branches.
Abdominal portion of the sympathetic trunk, with the celiac plexus and hypogastric plexus.
Duodenojejunal fossa.
Posterior abdominal wall, after removal of the peritoneum, showing kidneys, suprarenal capsules, and great vessels.
Front of abdomen, showing surface markings for arteries and inguinal canal.
Inferior mesenteric artery
Lumbar and sacral plexus. Deep dissection.Anterior view.
Lumbar and sacral plexus. Deep dissection.Anterior view.
Lumbar and sacral plexus. Deep dissection.Anterior view.

External links[edit]

SUNY Figs 39:02-05 - "Branches of the inferior mesenteric artery."
SUNY Labs 40:11-0103 - "Posterior Abdominal Wall: Branches of the Abdominal Aorta"
SUNY Anatomy Image 7924
SUNY Anatomy Image 7997
SUNY Anatomy Image 8407
SUNY Anatomy Image 8659
Atlas of anatomy at UMich abdo_wall70 - "Posterior Abdominal Wall, Dissection, Anterior View"
sup&infmesentericart at The Anatomy Lesson by Wesley Norman (Georgetown University)

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

1. 下大静脈フィルター留置とその合併症 placement of inferior vena cava filters and their complications
2. 妊娠における深部静脈血栓症および肺塞栓症：治療 deep vein thrombosis and pulmonary embolism in pregnancy treatment
3. 副甲状腺の外科解剖学 surgical anatomy of the parathyroid glands
4. 大腿静脈カテーテルの留置 placement of femoral venous catheters
5. 静脈血栓症の原因の概要 overview of the causes of venous thrombosis

English Journal

Anterior retroperitoneal rami: Until now unnamed direct branches of the abdominal aorta.

Turyna R1, Kachlik D, Feyreisl J, Stingl J, Baca V.
Clinical anatomy (New York, N.Y.).Clin Anat.2014 Sep;27(6):894-9. doi: 10.1002/ca.22371. Epub 2014 Mar 13.
The aim of the study was to gain a thorough knowledge of the topography and distribution of until now officially unnamed minute direct branches from abdominal aorta, stemming from its ventral and lateral aspects, supplying surrounding tissue, and to comprise it to the existing studies. The study was
PMID 24634276

Positional relationships of abdominal aorta landmarks for angiography: observations from the intravascular space.

Takahashi T1, Takeuchi K, Ito T, Hayashi S, Qu N, Itoh M.
Surgical and radiologic anatomy : SRA.Surg Radiol Anat.2014 Sep;36(7):681-8. doi: 10.1007/s00276-013-1249-3. Epub 2013 Dec 27.
PURPOSE: To clarify the positional relationships of abdominal aorta (Ao) landmarks by way of observations from the intravascular space to facilitate angiography.METHODS: A total of 95 donated Japanese cadavers were observed. We excluded 32 cadavers with anatomical variation at the celiac trunk (CT)
PMID 24370577

A prospective trial evaluating the clinical performance of a novel surgical energy device in laparoscopic colon surgery.

Milsom JW1, Trencheva K, Sonoda T, Nandakumar G, Shukla PJ, Lee S.
Surgical endoscopy.Surg Endosc.2014 Aug 27. [Epub ahead of print]
INTRODUCTION: The aim of this prospective human trial was to evaluate the clinical performance of a novel THUNDERBEAT (TB) energy device in laparoscopic colon surgery. This study reports the first human trial in USA with this combined energy device in colon surgery.METHODS AND PROCEDURES: This is a
PMID 25159634

「下腸間膜動脈」

Artery: Inferior mesenteric artery
	Sigmoid colon and rectum, showing distribution of branches of inferior mesenteric artery and their anastomoses. (Inferior mesenteric artery labeled at center.)
	Abdominal part of digestive tube and its attachment to the primitive or common mesentery. Human embryo of six weeks. (Inferior mesenteric artery labeled at bottom right.)
Latin	arteria mesenterica inferior
Gray's	subject #154 609
Source	abdominal aorta
Branches	left colic artery, sigmoid branches, superior rectal artery
Vein	inferior mesenteric vein
Precursor	vitelline arteries
MeSH	Mesenteric+Artery,+Inferior

　　[★]

英: inferior mesenteric artery (Z), IMA
ラ: arteria mesenterica inferior
関: 上腸間膜動脈

L3

起始

腹大動脈

走行

分布

枝

腹腔動脈	foregut	前腸に由来する臓器(食道下部、胃、十二指腸、肝臓、胆嚢、膵臓)、脾臓 stomach to proximal duodenum; liver, gallbladder, pancreas
上腸間膜動脈	midgut	distal duodenum to proximal 2/3 of transverse colon
下腸間膜動脈	hindgut	distal 1/3 of transverse colon to upper portion of rectum