Sigmoid Anatomy

It connects the descending colon with the rectum. In this article we will discuss the anatomy of the sigmoid colon including its blood supply.

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The sigmoid colon is part of the hindgut.

Sigmoid anatomy. The long length of the mesentery permits this part of the colon to be particularly mobile. The sigmoid sinus is actually a pair of two sinuses right and left that enable veins to spread from the middle of the head downwards. Like the descending colon.

After the distal descending colon has curved medially it enters the pelvis where it gains a mesentery and is then called the sigmoid colon. The iliac colon stretches from the crest of the ilium or upper border of the hipbone to the inner border of the psoas muscle which lies in the left iliac fossa. This dual structure is considered an extension of the.

It forms a loop that averages about 3540 cm 1378 1575 in in length. It acts as a site for water absorption from the faeces as a site for flatus to be stored before being expelled and as a site of peristalsis. Sigmoid sinus within the head are small cavities or spaces referred to as sinuses and they primarily serve as drainage for venous blood.

Sigmoid colon gross anatomy. It is the last part of the colon before the rectum. The sigmoid colon or pelvic colon is the part of the large intestine that is closest to the rectum and anus.

The sigmoid colon is attached to the posterior pelvic wall by a mesentery the sigmoid mesocolon. Some are found within the cranial bones and others in soft tissues of the head. The long length of the mesentery permits this part of the colon to be particularly mobile.

The sigmoid colon is commonly divided into iliac and pelvic parts. Lymphatics travel with vessels to the inferior mesenteric group. The sigmoid colon is the terminal portion of the large intestine before reaching the rectum.

The sigmoid colon derives its name from a greek letter sigma. The loop is typically shaped like a greek letter sigma ς or latin letter s thus sigma oid.

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