science

Inferior rectal artery

Inferior rectal artery is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Inferior rectal artery rather than just read about it. In short: The inferior rectal artery (inferior hemorrhoidal artery) is an artery that supplies blood to the lower third of the anal canal below the pectinate line. Structure The inferior rectal artery arises from the internal pudendal artery as it passes above the ischial tuberosity.

Key takeaways

Inferior rectal artery belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Inferior rectal artery to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Inferior rectal artery from memory before moving on to harder problems.

Reference excerpt

The inferior rectal artery (inferior hemorrhoidal artery) is an artery that supplies blood to the lower third of the anal canal below the pectinate line.

Structure The inferior rectal artery arises from the internal pudendal artery as it passes above the ischial tuberosity. Piercing the wall of the pudendal canal, it divides into two or three branches which cross the ischioanal fossa, and are distributed to the muscles and integument of the anal region, and send offshoots around the lower edge of the gluteus maximus to the skin of the buttock. They anastomose with the corresponding vessels of the opposite side, with the superior and middle rectal arteries, and with the perineal artery. These anastomoses can be seen during angiography performed for hemorrhoidal artery embolization.

Function The inferior rectal artery supplies oxygenated blood to the anal sphincter and the lower third of the anal canal below the pectinate line.

Additional images

See also Superior rectal artery Middle rectal artery Inferior rectal nerve

References This article incorporates text in the public domain from page 619 of the 20th edition of Gray's Anatomy (1918)

External links Anatomy figure: 41:04-05 at Human Anatomy Online, SUNY Downstate Medical Center - "Inferior view of female perineum, branches of the internal pudendal artery." Anatomy figure: 42:03-05 at Human Anatomy Online, SUNY Downstate Medical Center - "Branches of internal pudendal artery in the male perineum." Anatomy image:9077 at the SUNY Downstate Medical Center Anatomy image:9085 at the SUNY Downstate Medical Center perineum at The Anatomy Lesson by Wesley Norman (Georgetown University) (analtriangle3) figures/chapter_32/32-2.HTM: Basic Human Anatomy at Dartmouth Medical School figures/chapter_32/32-3.HTM: Basic Human Anatomy at Dartmouth Medical School

Illustrations

Worked examples

Example 1 — a first encounter with Inferior rectal artery

Start with the simplest possible case. Write down what Inferior rectal artery claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Inferior rectal artery before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Inferior rectal artery ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Inferior rectal artery

In research: Inferior rectal artery appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Inferior rectal artery in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Inferior rectal artery is common in secondary-school and first-year university syllabi. It links to neighbouring topics Arteries of the abdomen, Cardiovascular system stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Inferior rectal artery outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Inferior rectal artery in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Inferior rectal artery means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Inferior rectal artery out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Inferior rectal artery in simple terms?

The inferior rectal artery (inferior hemorrhoidal artery) is an artery that supplies blood to the lower third of the anal canal below the pectinate line. Structure The inferior rectal artery arises from the internal pudendal artery as it passes above the ischial tuberosity.

Why does Inferior rectal artery matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Inferior rectal artery?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Inferior rectal artery.