Body Parts That Start With I

The human body is very complex and it consists of many organs and tissues.

Each part of our body has its function and its role for the organism.

We cannot live without some parts of the body, while others are secondary and the organism can function well without them.

This article will be dedicated to the parts of the human body.

More precisely, today we will talk about the body parts and organs that begin with the letter I.

There aren’t many body parts that start with this letter, but we will tell you what they are and we will explain you their functions.

As we have already mentioned, each part of the body has a certain function and it contributes to the functioning of the whole organism.

When it comes to a certain part of the body, we will tell you first something about its anatomical features, and then we will tell you something about the practical use of that body part.

Of course, we will also mention if there are some interesting facts related to a certain part of the body.

Now we can start listing the parts of the body that start with the letter I.

Most Common Body Parts That Start With I

Index finger

As we all know, there are 5 fingers on the hand.

The first body part that starts with I and that we are going to mention is the index finger. This finger is also called the forefinger.

It represents the second finger in the row if we count the fingers starting from the thumb.

Therefore, the index finger is the finger that is right next to the thumb or we can say that this finger is located between the middle finger and the thumb.

The index finger is not the longest finger on the human hand, but it is certainly the most sensitive.

This finger consists of 3 phalanges, but there are no muscles in the index finger.

The muscles in the hand are controlling the function of the index finger. The function of the index finger is quite important.

When we put the index finger in an upright position, it can indicate the number one.

We use the index finger when we want to point to something or to someone we see.

In addition, we can use the index finger when we want to indicate the direction in which to go.

Therefore, the index finger is the finger with which we always point to something, whether it is an object, a person, a direction of movement or something else.

Because of that this finger is usually called the pointing finger.

Also, the index finger is mainly used when we press the keyboard or the phone screen.

Besides, there are many other functions of the index finger. For example, we can raise our index finger if we threaten someone, and it is often used by parents who scold their children for something.

When a parent tells a child “you’re going to get spanked for that, don’t do that again”, for example, then the parent will use an index finger up and rub it back and forth.

Also, it often happens that by hitting the index finger on the table or some other surface, we show that we are nervous about something or that we are indecisive about what decision we should make.

Also, we all know that a fingerprint is generally taken from the index finger.

In addition, it is believed that based on the structure of the index finger itself and on the basis of someone’s fingerprint, it is possible to determine what type of person someone is.

As you can see, the index finger is used in many ways and has many functions.

Therefore, this finger is one of the most important parts not only of the hand, but also of the entire human body.

Inner thigh

The next body part starting with I is the inner thigh. There are five muscles in the inner thigh that enable us to move our legs towards the midline of the body.

The inner thigh of the leg is quite problematic, first of all for women, because fat deposits mostly accumulate on inner thighs.

If this happens to you, then certain exercises for this part of the body are definitely recommended, as well as an adequate diet.


The intestines are one of the most important internal organs.

The intestines have also been known as bowels and they form a part of the gastrointestinal tract which is in charge of digesting food and all other digestive processes.

The intestines are in the form of long tubes and extend from the stomach to the anus.

Nutrients and water are absorbed in the intestines and that is one of the reasons why the intestines are very important.

The most important intestines are the large intestine and the small intestine.

Now we will tell you a little more about each of them.

First of all, we have to say that the large intestine is the final part of the digestive tract and it continues into the small intestine.

The large intestine is also called the large bowel or the colon.

The large intestine has a very important function, and consists of the cecum, the colon, the rectum and the anal canal.

When the food is partially digested, it goes through the cecum and it comes to the colon. What happens in the colon?

Nutrients, water and electrolytes in the colon have to be absorbed by the body and after that remains only a waste that is solid and that is known as a stool.

The stool goes further along the colon and it comes to the rectum where it is stored. Of course, through the anus or the anal canal the stool leaves our body.

The next intestine that we are going to explain is the small intestine.

It is also a part of the gastrointestinal tract and it plays a very important role in digestion.

First of all, you should know that the small intestine extends from the stomach to the large intestine.

It is in the small intestine that most of the food is absorbed, that is, minerals and nutrients are absorbed. The largest part of digestion is done in the small intestine.

There is something like tiny hairs on the surface of the small intestine, which increases the size of the small intestine.

There are 3 parts of the small intestine, which are the so-called ileum, then the jejunum, and finally the duodenum, which you’ve probably heard of.

There are many intestinal diseases and therefore the health of the gastrointestinal tract should be controlled in time.

Intestines are very sensitive internal organs, and now we will list some of the most common conditions that can occur.

First of all, inflammation of the small intestine can occur, which is known as the stomach flu. It can be treated successfully with adequate medicines.

Cancer rarely occurs in the small intestine, but the colon cancer is a very common disease today.

If it is detected in time, colon cancer can be successfully cured, but if it is not detected in time, this disease can lead to death in a very short period of time.

A typical disease of the small intestine is a celiac disease that occurs when the small intestine is unable to absorb nutrients properly.

The main symptoms of celiac disease are loss of appetite, weight loss and abdominal pain.

A very common disease is inflammation of the large intestine, which is called colitis.

Hemorrhoids represent swollen blood vessels in the anis area and at the bottom of the colon. The main symptom is bleeding in the stool.

Another inflammatory condition is the Crohn’s disease that usually causes diarrhea and abdominal pain.

Of course, a very common condition related to intestines is constipation, too. It occurs when there are difficulties in the movement of bowels.

Other intestine conditions are salmonellosis, diarrhea, ulcerative colitis, colon polyps, colon cancer, rectal cancer, irritable bowel syndrome, etc.


We will also mention incisors as the part of the body that starts with I.

The incisors are the teeth that are located at the front of the mouth.

Those teeth are used for cutting food. In babies, two incisors on the lower jaw usually grow first and after them the upper incisors grow as well.

Incisors are milk teeth that fall out around the age of six in children.

Humans have 8 incisors in total, which means that they have 4 incisors in each jaw.

Other Body Parts Starting With I

Inner ear

Inner eye

Inner arm

Inner lobe



Ilium bone

Iliac crest

Iliac spine

Iliac vein

Iliac artery

Intercostal muscles

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