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Welcome to Learn Bones

LearnBones.com provides a resource on both the bones of the human skeleton and the Muscular System. Learn about the bones, memorize their names, and see their positions in the human body. To get started, click on one of categories above. If you want more information about this site, check out the About or Contact Us pages.

Test Your Knowledge

How Many Bones in the Human Body?

An adult has a total of 206 bones in their skeleton

How many Bones in a Child's Body?

A newborn baby has 270 bones in the skeletal system. Most of their skeleton is made up of cartilage which forms bone as it hardens over time. The bones in a child's skeleton fuse together as they grow, reducing the number, up until about 25 years old.

What is The Strongest Bone in the Human Body?

The femur or thigh bone is the strongest bone in the body. It is situated between the pelvis and the knee. It is also the longest bone in the body and is fully one quarter of your bodies' height.

What is the Weakest Bone in The Body?

The weakest bones in your body are the tiny bones inside your ear that enable you to hear. On the other hand; the most commonly fractured bone is the clavicle.

What is the Hardest Bone in the Body?

The hardest bone in the body is the petrous portion of the temporal bone. The temporal bones are found at the sides and base of the skull and the petrous portion is specifically the part at the base of the skull that contains the organs for hearing.

Where are the Smallest bones in Your Body Located?

The smallest bone in the body is called the stapes. It is a stirrup shaped bone found inside the ear drum that transmits vibrations enabling us to hear.

How many Bones are in the Leg?

A human leg contains 30 bones. There are 26 bones that make up the foot, and the four major bones of the leg, which are the thigh bone (femur), the shin bone (tibia), the calf bone (fibula) and the knee cap (patella)

Latest News

Rotator Cuff Tears | Sprained Shoulder

by Vicki Joseph on August 2nd, 2014

Rotator cuff tears are the leading cause of shoulder pain in patients and are quite common in athletes and elderly patients, with over two million rotator cuff injuries treated every year. A rotator cuff tear refers to a condition where the rotator cuff tendon is damaged or ruptured. It can be quite painful and limit the movement of the arm, depending on the severity of the tear. Anatomy of the Shoulder Joint The shoulder has three main bones- upper arm bone (humerus), shoulder blade (scapula), and collarbone (clavicle). Similar to the hip, the shoulder is a ball-and-socket joint, where the head of the humerus rests in a socket in the shoulder blade. The rotator cuff assembly plays an important role in keeping the humerus securely placed in the shoulder joint. The rotator cuff assembly is a group of the below four shoulder muscles that are located surrounding the shoulder joint:  Supraspinatus Infraspinatus Subscapularis  Teres minor This group of muscles works collectively to support and stabilize the shoulder joint. These muscles also help in the lifting and rotating movements of the arm. The rotator cuff muscles have four tendons that combine to form the rotator cuff tendon. This tendon is much [...]

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Basal Joint Arthritis | Pain at the Base of The Thumb

by Vicki Joseph on July 19th, 2014

Basal joint arthritis, which is also called thumb arthritis, occurs at the base of the thumb. Arthritis is the condition of deterioration of joints due to injury or wear and tear. Basal joint arthritis is the most common type of arthritis to affect the hand, and it can be a very painful and limiting condition. The pain is usually at the base of the thumb near the wrist, and the thumb begins to lose its ability to pinch or grip, and also loses its strength and range of motion. Thumb arthritis is most commonly in the form of osteoarthritis, which is due to age-related wear and tear on the joints. However, basal joint arthritis appears to affect people earlier in life than other forms of degenerative arthritis. This is typically a progressive condition which worsens with time. Anatomy of Basal Joint Arthritis The basal joint, also known as the thumb carpometacarpal (CMC) joint, is located at the base of the thumb, and connects the thumb to the wrist. This joint is responsible for the pivoting, pinching and swiveling movements of the thumb.  At the ends of the bones in the joint, there is thick, smooth articular cartilage that protects the [...]

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Knee Ligaments – The Ligaments of The Knee

by Vicki Joseph on July 5th, 2014

Knee ligaments are the tough, flexible strips of tissues that connect the bones in the knee joint. They play an important role in stabilizing the knee, and allowing the knee joint its full range of movement.. Anatomy of the Knee The knee joint is the largest and one of the most complex and hard-working joints in the human body. There are four bones that constitute the knee joint: the femur (thigh bone), tibia (main shin bone), fibula (outer shin bone), and the patella (knee cap). The femur and tibia are the main bones involved in the knee’s movement, and the patella sits in front of the knee joint to offer protection to the joint. At the ends of the bones, there is thick articular cartilage that helps to reduce the friction between the bones in the joint as they move. As the knee joint suffers from constant impact during running and walking, there is also a natural shock- absorber called the meniscus, which is a thick, rubbery cartilage located in between the thigh bone and the shin bone. To help the bones in the knee joint to work properly in a coordinated fashion, there are four ligaments that hold the [...]

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Fluid On The Knee – Water on The Knee

by Vicki Joseph on June 28th, 2014

Fluid in the Knee Fluid in the knee (also known as ‘water on the knee’ or ‘knee effusion’) is a condition resulting from excess fluid accumulation in or around the knee joint. The knee joint contains a small amount of fluid under normal conditions, within the joint itself and in surrounding tissues. When the fluid build-up is more than normal due to various conditions including disease and trauma, it leads to ‘water on the knee’.  The Anatomy of the Knee Joint The knee joint is surrounded by a protective capsule lined by the synovial membrane, which forms a ‘joint space’. Normally, this capsule has a small amount of fluid called synovial fluid, which acts as a lubricant and reduces friction between the bones as they move. In response to inflammation of the tissues or any trauma, the protective capsule releases more synovial fluid, which can lead to accumulation of this fluid. Another source of fluid in the knee joint is a large bursa located within the knee joint. Several conditions can lead to inflammation of this bursa (bursitis), and cause it to become distended with synovial fluid or blood, which again leads to ‘fluid in the knee’. What are the [...]

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Knee Tendonitis

by Vicki Joseph on June 21st, 2014

Knee Tendonitis Knee tendonitis (also called tendinitis) is the inflamed and irritated condition of tendons in the knee, due to overuse or repetitive actions. As a result, this condition is mostly observed in athletes such as runners, jumpers, and basketball/ volleyball players. Tendonitis or tendinitis is not to be confused with tendinosis, which is a chronic condition where, instead of the tendon becoming inflamed, it becomes gradually thicker and develops microscopic tears progressively. Both conditions have similar symptoms, however they are treated differently. Anatomical description A tendon is the flexible, fibrous band of tissue that connects muscles to bones. Tendons have a surrounding vascular tissue lining, to provide blood supply and nutrition to the tendon. Tendons are very important in every movement because they transmit the pull of each muscle to the bone. The knee joint has a complex network of tendons and ligaments. The patellar tendon connects the patella (kneecap) to the shin bone. The patellar tendon, kneecap quadriceps tendon and the popliteus tendon, are all part of the extensor mechanism of the knee, which allow the knee to extend, straighten out, and provide strength for a kicking motion. Types of Knee Tendonitis                                                            There are three main types of [...]

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