Anal Canal
Anal Canal - Related Videos
01:26
Psychosexual Stages of Personality: Anal
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2025
Sigmund Freud's theory of psychosexual development describes the anal stage as occurring between 18 months and three years of age. During this period, children derive pleasure from controlling and releasing their bowel movements. However, they quickly learn that societal expectations impose restrictions on when and where this can happen. This stage marks a critical point where children begin to develop a sense of control and mastery over their bodily functions, as well as their broader...
06:26
Capturing Flow-weighted Water and Suspended Particulates from Agricultural Canals During Drainage Events
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Cited by 2 •
2017
Nutrients present in particulate form can contribute significantly to the overall loads in agricultural drainage waters. This study describes a novel method to capture flow-weighted water and suspended particulates from farm canal drainage over the entire duration of the drainage event.
08:38
Testing of all Six Semicircular Canals with Video Head Impulse Test Systems
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Cited by 26 •
2019
This protocol describes how to correctly perform the video head impulse test with two separate test systems commonly used worldwide. Both the 2D and 3D video head impulse test methods are described.
03:52
Posterior Semicircular Canal Approach for Inner Ear Gene Delivery in Neonatal Mouse
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Cited by 37 •
2018
In this study, we describe the posterior semicircular canal approach as a reliable method for inner ear gene delivery in neonatal mice. We show that gene delivery through the posterior semicircular canal is able to perfuse the entire inner ear.
10:30
The C. elegans Excretory Canal as a Model for Intracellular Lumen Morphogenesis and In Vivo Polarized Membrane Biogenesis in a Single Cell: labeling by GFP-fusions, RNAi Interaction Screen and Imaging
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Cited by 6 •
2017
The C. elegans excretory canal is a unique single-cell model for the visual in vivo analysis of de novo polarized membrane biogenesis. This protocol describes a combination of standard genetic/RNAi and imaging approaches, adaptable for the identification and characterization of molecules directing unicellular tubulogenesis, and apical membrane and lumen biogenesis.
FAQs
The two sphincters provide complementary forms of control. The internal anal sphincter uses smooth muscle and operates involuntarily, while the external anal sphincter uses skeletal muscle and can be controlled voluntarily. Considering both components explains how anal canal function combines automatic regulation with deliberate control during continence and fecal passage.
Sensory changes near the dentate line contribute to how the body regulates continence and defecation. This region therefore provides an important biological context for understanding how information from the anal canal is integrated with sphincter activity. Studying these sensory differences helps connect local anatomy with the transition between retaining and passing fecal material.
Continence and defecation depend on coordination rather than on either sphincter acting alone. Involuntary smooth-muscle activity contributes to ongoing regulation, whereas voluntary skeletal-muscle control allows deliberate participation in fecal passage. Biology studies this interaction to explain how the anal canal maintains control while still permitting the gastrointestinal tract to empty.
Muscle type predicts the kind of control available in each sphincter. Smooth muscle is associated with involuntary activity, whereas skeletal muscle supports voluntary control. This distinction helps researchers and students interpret anal canal function at both the tissue and organ levels, linking microscopic muscle properties with continence and defecation.
A useful analysis considers the relationship between the rectum, the anal canal, and the external opening, then evaluates both sphincters and sensory changes near the dentate line. Examining these features together provides a functional view of gastrointestinal anatomy rather than treating the canal as an isolated structure.
Anal canal biology provides a framework for examining fecal incontinence by focusing on the systems that support continence. Relevant considerations include involuntary internal sphincter activity, voluntary external sphincter control, and sensory changes near the dentate line. These components help relate altered gastrointestinal control to the clinical problem of losing normal continence.
The anal canal is an important anatomical reference for studying hemorrhoids and other anorectal diseases because it connects disease-related questions with the structures responsible for continence and defecation. Understanding its muscular control, sensory organization, and position at the end of the gastrointestinal tract helps place these conditions within broader biological and medical contexts.