Alimentary Canal – Anatomy

Digestion is the process of breaking down big food particles into smaller, water-soluble particles that may be absorbed more easily by the blood plasma. The entire process from the intake to the digestion of food, as well as the disposal of undigested material, are carried out with the help of various parts of the body.

What is the Alimentary Canal?

The alimentary canal is the channel via which food enters our bodies and exits via the anus after digestion. It’s a tube-like structure that extends from the mouth to the anus. The alimentary canal, often known as the digestive tract, plays an important function in human digestion. The Mouth and Oral Cavity are the major organs of the alimentary canal. There are also the Oesophagus and Stomach, and the intestines that are divided into two sections: small and large.

The alimentary canal and several digestive glands make up the human digestive system. The alimentary canal, which runs from the mouth to the anus, is a muscular tube. The anus, large intestine, small intestine, stomach, oesophagus, throat and mouth form the human digestive system.

Let’s take a closer look at the many components of the human digestive system.

Mouth

The initial portion of our digestive system is the mouth. The mouth is used to consume food.

Oral cavity

The palate, tongue and teeth make up the oral cavity.

• Palate – The roof of the mouth cavity is called the palate
• Tongue – Tongue – A muscular and glandular structure linked to the oral cavity’s base. Lingual papillae are little projections on the top surface of the tongue. Circumvallate, fungiform, and filiform lingual papillae are the three forms
• Teeth- Humans are diphyodont, meaning they have two sets of teeth: milk or deciduous teeth and permanent teeth. The functions of the various types of teeth in humans are listed below
• The crown, neck and root are the three components that make up a tooth’s structure. The crown is the visible part of the tooth, the neck is the area where it is covered by gums, and the root is lodged in the jaw bone’s socket (Thecodont)

Pharynx

It serves as a conduit for food and air. The epiglottis stops food from entering the windpipe.

Oesophagus

It’s a muscular tube that connects the mouth to the stomach and transports tiny boluses of food. The gastro-oesophageal sphincter is a muscle that regulates food flow into the stomach.

Stomach

It’s a muscular sac that sits in the upper left corner of the abdominal cavity. It is divided into four sections: pyloric, body, fundus and cardiac.

1. Cardiac part– The first portion is the cardiac part, which is located near the heart. The gastro-oesophageal sphincter controls the passage of the oesophagus to the stomach
2. Fundus– The fundus is a dome-shaped organ that is normally filled with air
3. Body– This is the primary component of the stomach
4. Pyloric- It opens in the duodenum, the initial segment of the small intestine. The pyloric sphincter controls the entry of the stomach into the small intestine

Small Intestine

It is made up of three sections: the Ileum, Jejunum and Duodenum. It is the longest component of the alimentary canal.

1. Duodenum– The first is the duodenum, which is formed like a C. The hepatopancreatic duct adds pancreatic, bile, and hepatic secretions to the diet
2. Jejunum– The small intestine’s middle section
3. Ileum– The ileum is a coiled tube that connects the small and large intestines

Large Intestine

The tiny intestine is connected to the big intestine through a tube. It is divided into three sections: the Rectum, Colon and Caecum.

1. Caecum– The caecum is a tiny sac-like structure that houses symbiotic bacteria. It is linked to the vermiform appendix (vestigial organ)
2. Colon– The ascending, transverse, sigmoid and descending parts of the colon are separated into four sections
3. Rectum– The third part of the body is the rectum, which opens into the anus