Research any topic before you write.

Find related topics. | Discover entities. | See connections. | Build a topical map.

Internal anal sphincter: Structure, Function & Physiology

The internal anal sphincter, IAS, or sphincter ani internus is a ring of smooth muscle that surrounds about 2.5–4.0 cm of the anal canal. It is about 5 mm thick, and is formed by an aggregation of the smooth (involuntary) circular muscle fibers of the rectum. [citation needed]

Language: English [EN]
Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.
100%
More settings
100% 100% 100% 100% 100%

Internal anal sphincter topic overview

The analysis highlights Structure, Function and Physiology as prominent areas in the source structure around Internal anal sphincter.

Related topics
22
Source areas
5
Connected nodes
27
Extracted relationships
14
Concept neighborhoods
14
Bridge connections
27

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

Overview · 7 topics
Function · 5 topics
Structure · 5 topics
Physiology · 3 topics
Clinical significance · 2 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Actions
Keeps the anal canal and orifice closed, aids in the expulsion of the feces
FMA
15710
Latin
musculus sphincter ani internus
Nerve
Pelvic splanchnic nerves (S4), thoracicolumbar outflow of the spinal cord
TA2
3018
TA98
A05.7.05.011

Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

Structure

Function

Physiology

Clinical significance

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

How Internal anal sphincter connects Entity context

The extracted context around Internal anal sphincter shows recurring relationship patterns in the source. For example, Internal anal sphincter → At, It, Its, The Another extracted example is Internal anal sphincter → L1-L2, S2-S4, The. Use these groups to spot repeated connection types before inspecting the individual relationships.

Internal anal sphincter

Top relations

related to Structure · 4
Internal anal sphincter → At, It, Its, The
related to Innervation · 3
Internal anal sphincter → L1-L2, S2-S4, The
Actions · 1
Internal anal sphincter → Keeps the anal canal and orifice closed, aids in the expulsion of the feces
FMA · 1
Internal anal sphincter → 15710
Latin · 1
Internal anal sphincter → musculus sphincter ani internus
Nerve · 1
Internal anal sphincter → Pelvic splanchnic nerves (S4), thoracicolumbar outflow of the spinal cord
TA2 · 1
Internal anal sphincter → 3018
TA98 · 1
Internal anal sphincter → A05.7.05.011
is a · 1
Internal anal sphincter → specialised thickened terminal portion of the inner circular layer of smooth muscle of the large intestine

Important terminology

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

anal sphincter external rectum canal muscle ani contraction internal rectal continence ias stimulation smooth also involuntary sympathetic parasympathetic feces relaxation

Internal anal sphincter relationships Subject–Predicate–Object triples

TTTA extracted 14 structured relationships around Internal anal sphincter. Examples in this analysis include Internal anal sphincter → Actions → Keeps the anal canal and orifice closed, aids in the expulsion of the feces and Internal anal sphincter → FMA → 15710. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
Internal anal sphincterActionsKeeps the anal canal and orifice closed, aids in the expulsion of the feces1.00infobox
Internal anal sphincterFMA157101.00infobox
Internal anal sphincterLatinmusculus sphincter ani internus1.00infobox
Internal anal sphincterNervePelvic splanchnic nerves (S4), thoracicolumbar outflow of the spinal cord1.00infobox
Internal anal sphincterTA230181.00infobox
Internal anal sphincterTA98A05.7.05.0111.00infobox
Internal anal sphincteris aspecialised thickened terminal portion of the inner circular layer of smooth muscle of the large intestine0.90text
Internal anal sphincterrelated to InnervationThe0.60section
Internal anal sphincterrelated to InnervationL1-L20.60section
Internal anal sphincterrelated to InnervationS2-S40.60section
Internal anal sphincterrelated to StructureThe0.60section
Internal anal sphincterrelated to StructureIt0.60section

Related concept clusters Concept neighborhoods

The concept neighborhoods around Internal anal sphincter bring nearby vocabulary together. In this analysis, examples include Smooth, Ani and Muscle. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • Internal anal sphincter
    • Smooth
    • Ani
    • Muscle
    • Aids
    • Expulsion
    • Feces
    • Internus
    • Sphincter
    • Circular
    • Internal
    • Nerve
    • Rectum
  • internal anal sphincter
    • Smooth
    • Sphincter
    • Canal
    • External
    • Ani
    • Muscle
    • Aids
    • Expulsion
    • Feces
    • Internus
    • Circular
    • Internal
  • anal canal
    • Sphincter
    • Canal
    • External
    • Internal
    • Internus
    • Ani
    • Muscle
    • Smooth
    • Rectum
    • Continence
    • Ias
    • Distal
  • anal orifice
    • Sphincter
    • Canal
    • External
    • Internal
    • Ani
    • Muscle
    • Rectum
    • Distal
    • Innervation
    • Nerve
    • Smooth
    • Continence
  • external anal sphincter
    • Sphincter
    • Canal
    • External
    • Innervation
    • Continence
    • Internal
    • Rectum
    • Maintain
    • Ani
    • Distal
    • Levator
    • Muscle
  • smooth muscle
    • Aids
    • Expulsion
    • Feces
    • Circular
    • Muscle
    • Smooth
    • Nerve
    • Rectum
    • Bladder
    • Citation
    • Deferens
    • Involuntary
  • feces
    • Smooth
    • Internal
    • Muscle
    • Bladder
    • Deferens
    • Internus
    • Involuntary
    • Needed
    • Rectum
    • Seminal
    • Urinary
    • Vas
  • involuntary
    • Aids
    • Citation
    • Expulsion
    • Feces
    • Needed
    • Circular
    • Smooth
    • Muscle
    • Rectum
    • Sphincter

Connections between topic areas Semantic bridges

For Internal anal sphincter, one of the stronger structural bridges in this analysis connects Internal anal sphincter with Overview. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
Internal anal sphincterOverview · splits 20 ⟂ 8
Internal anal sphincterStructure · splits 22 ⟂ 6
Internal anal sphincterFunction · splits 22 ⟂ 6
Internal anal sphincterPhysiology · splits 24 ⟂ 4
Internal anal sphincterClinical significance · splits 25 ⟂ 3

Map overview Semantic statistics

Internal anal sphincter

Nodes28
Edges27
Triples14
Avg. degree1.93
Density0.071429
Components1

Source & methodology

TTTA analyzes the structure around Internal anal sphincter to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as Structure, Function & Physiology, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — Internal anal sphincter · EN edition · Analysis: TopicsToTalkAbout

For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.