Enlarged Rectum Training Model

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Model Number: NH-64328

Brand: Niche Healthcare


It shows the structure of rectum and anus section. Enlarged 10 times around.

SKU: VS5581499 Category: Tag:


Categories         Anatomical Model

Subject               Medical Science

Material              Eco-friendly PVC

Application       School/Hospital/Laboratory


The anus is the terminal part of the digestive system and plays a crucial role in the elimination of waste from the body. Here are the key functions and components of the anus in the digestive system:


Elimination of Faeces:

The primary function of the anus is to control the expulsion of faeces, which are waste products of digestion, from the body. This process is known as defecation.

Control of Bowel Movements:

The anus has a complex mechanism to regulate when and how faeces are expelled. This involves both voluntary and involuntary muscles.


Internal Anal Sphincter:

This is a ring of smooth muscle that is not under voluntary control. It remains contracted to keep the anus closed and prevent involuntary leakage of faeces. It relaxes in response to pressure from stool in the rectum.

External Anal Sphincter:

This is a ring of skeletal muscle that is under voluntary control. It allows for the conscious decision to open or close the anus during defecation. It provides an additional layer of control to prevent accidental defecation.

Anal Canal:

The anal canal is the final section of the rectum and is about 2-4 centimetres long. It is lined with mucous membrane and has specialized structures to aid in the control of stool passage.

Process of Defecation

Filling of the Rectum:

As digested food moves through the colon, water is absorbed, and the waste material is formed into stool. When the rectum fills with stool, stretch receptors in the rectal walls signal the need to defecate.

Relaxation of the Internal Anal Sphincter:

The internal anal sphincter relaxes automatically in response to the distension of the rectum.

Contraction of the External Anal Sphincter:

The external anal sphincter remains contracted until a person decides to defecate. This voluntary control allows the person to choose an appropriate time and place for defecation.


When a person decides to defecate, the external anal sphincter relaxes, and the muscles of the rectum contract to expel the faeces through the anal canal and out of the body.


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