Human Body Parts That Start With I – 20+ Unique Words That You Never Hear Before

Is your anatomy class lacking in excitement? Would you like to spice it up? Here’s a list of human body parts that start with I! This fun and informative list will help you learn more about the different parts of your body. Remember that this isn’t an exhaustive list, but it will give you a good overview of the different body parts that fall into this category. Let’s get started!

Human Body Parts That Start With I

The first body part is the iris. The iris is the colored part of your eye. It helps to control the amount of light that enters your eye. The second body part is the ileum. The ileum is a section of your small intestine. It helps to digest food and absorb nutrients from food. Let’s look at some more parts of the human body that start with I:

 Discussion about the Parts

• Iliac Artery: The iliac artery is a large blood vessel that runs from the lower abdomen to the pelvis. This vessel transports oxygenated blood from the heart to the lower extremities. The iliac artery is a branch of the abdominal aorta, which branches off from the heart.
• Iliac Vein: The iliac vein is large in the human body that carries blood from the lower extremities back to the heart. It lies in the iliac region of the body, which is the area between the hip and the lower abdomen.
• Incus: Incus is one of the smallest bones in the human body. Its name comes from a Latin word meaning “anvil” because the bone shape looks like an anvil. The Incus is located in the middle ear and helps transmit sound vibrations to the inner ear.
• Inferior Alveolar Nerve: It’s a branch of the mandibular nerve, a branch of the trigeminal nerve. The inferior alveolar nerve travels through the mandibular foramen (a hole in the bone) and innervates (supplies nerves to) the teeth of the lower jaw. It also innervates the mucous lining of the lips and the base of the tongue.
• Inferior Cerebellar Arteries: The inferior cerebellar arteries are a pair of arteries that arise from the vertebral arteries and supply blood to the posterior lobe of the cerebellum. Each inferior cerebellar artery gives off several branches that supply blood to different parts of the brainstem and lower part of the cerebellum. The primary function of the inferior cerebellar artery is to provide blood to these areas so they can properly function.
• Inferior Epigastric Artery: A branch of the abdominal aorta that provides blood to the lower abdomen is called the Inferior Epigastric Artery. It is essential for developing the kidneys, fallopian tubes, and ovaries. The vessel also helps to provide essential nutrients and oxygen to these organs.
• Inferior Oblique Muscle: In the eye, the inferior oblique muscle is a deep mass that originates from the orbital floor and inserts into the eye. It functions to move the eye in a downward and outward direction. It also helps to stabilize the eye during movement.
• Inferior Rectus Muscle: The inferior rectus muscle receives its innervation from the sixth cranial nerve, also known as the abduces nerve. This nerve supplies motor fibers to the inferior and lateral rectus muscles. These muscles are responsible for rotations of the eye in opposite directions.
• Inferior Vena Cava: The Inferior Vena Cava (IVC) is a large vein that carries blood from the lower body to the heart. This large vein lies on the right side of the body, behind the liver. The IVC drains blood from the abdominal and pelvic organs and returns it to the heart.
• Inguinal Canal: This passageway runs through the lower abdominal wall and lies above the inguinal disc. It houses the spermatic cord in men, which contains the arteries, veins, and ductus deferens (where sperm goes from the testes to the penis). In women, the Inguinal Canal houses the round ligament, which helps support the uterus.
• Inguinal Ligament: The inguinal ligament is a band of tough fibrous tissue that extends from the pubic bone to the lower border of the ribcage. It helps to stabilize the hip and groin area.
• Inner Ear: Within the inner ear is not just an organ but a complex system of organs that play a vital role in keeping a person balanced and controlling their movements. Located deep within the skull, it includes the cochlea, which detects sound waves, and the semicircular canals, which sense movement and help keep you upright.
• Innominate Artery (Brachiocephalic Artery): The innominate artery (also known as the brachiocephalic artery) delivers oxygen-rich blood to the head and arms from the heart. It arises from the heart’s left ventricle and splits into two branches, the right subclavian artery, and the left common carotid artery.
• Inter-Atrial Septum: The inter-atrial septum is a thin wall of tissue that separates the right and left atria (upper chambers) of the heart. It helps prevent blood from flowing between the two sides of the heart. The inter-atrial septum consists of the fossa ovalis and the septal leaflet.
• Intercostal Nerves: The intercostal nerves are a set of nerves that run along the ribs. They provide sensation to the skin and muscles between the ribs and help control the chest’s movement.
• Internal Carotid Artery: The internal carotid artery contributes to the supply of blood to the brain. It branches off the aorta and runs through the neck, winding its way up to the brain. It’s responsible for delivering oxygenated blood to the cortex, cerebellum, brainstem, and other critical areas of the brain.
• Interventricular Septum: The interventricular septum is the wall between the heart’s two ventricles. It pumps blood from the heart to other body parts and separates the left and right ventricles. The interventricular septum consists of two parts: The membranous part, a thin layer of tissue, and the muscular part, which is thicker and has more muscle fibers.
• Intervertebral (Posterior) Joints: Intervertebral joints exist between the vertebrae in the spine. They allow for movement and protect the spinal cord. There are two types of intervertebral joints- posterior and anterior. The Posterior Joint is a synovial joint that contains a lubricating fluid called synovium. This fluid helps to reduce friction as the vertebrae move against each other. 
• Intervertebral (Posterior) Joints, Cervical Spine: These joints are located between the vertebrae in your spine and act as shock absorbers. The vertebrae have cushioning material called cartilage, which allows the vertebrae to move smoothly over each other. Without this cushioning, your spine would be much more susceptible to injury.
• Intervertebral Foramen: Intervertebral foramina are spinal nerves that run through small gaps between the vertebrae. These nerves relay signals from the brain to the rest of the body. The foramina get their names according to their location in the spine. For example, the cervical foramen lies in the neck region.
• Intestines: Intestines are long, thin tubes of tissue that begin at the stomach and end at the anus. Most intestines consist of the large intestine, also called the colon. The small intestine is about 20 feet long and coils within the large intestine.
• Ischio-Cavernosus Muscle: The Ischio-Cavernosus muscle is a small, triangular muscle located in the perineal region of the human body. This muscle serves an essential function in sexual intercourse, as it is responsible for elevating and depressing the penis. The pudendal nerve innervates the ischiocavernosus muscle.
• Ischium: The ischium is one of the bones in the human body. You’ll find it in the lower part of the pelvis, and it helps to support the upper body’s weight. The ischium is also involved in various activities such as sitting, walking and running.

Conclusion

That’s a wrap on our look at human body parts that start with I. It’s been an informative journey, and we hope you learned something new. We think it’s interesting how so many different body parts can start with the same letter – it just goes to show how diverse the human body is. This is just a sampling of some of the incredible and exciting body parts we all have. If you liked it, please share. Also, make sure you keep visiting us for more great posts in the future.