Joints are cartilage surfaces that connect bones to each other. This cartilage allows our bones to glide smoothly against one another, allowing us painless movement.

The small, ringer, middle and index fingers all have the same four joints:

Distal Interphalangeal Joint (DIP): The DIP joint is located at the tip of the finger, just before the finger nail starts. Arthritis can develop at this joint, and it is also commonly fractured.

Proximal Interphalangeal Joint (PIP): The PIP joint is the joint just below the DIP joint. It is located below the top two bones of the finger and allows the finger to bend and extend. This joint can become stiff easily after injury.

Metacarpophalangeal Joint (MCP): The MP joint is where the hand bone meets the finger bone, referred to as the “knuckle.” These joints are very important, allowing us to bend/flex and spread our fingers.

Carpometacarpal Joint (CMC Joint): The CMC joint is located at the bottom of the hand bone. This joint varies in each finger. For example, in the index finger, it has little motion. In the small finger, it has a lot of motion. Injuries and problems with this joint are uncommon.

The thumb joints are a little different than the other finger joints

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Arteries are multi-layered tubes that take blood from the heart to other places in the body. There are six arteries that travel into the hand.

Deep Palmar Arch
Named for its shape of an arch, the deep palmar arch is small but important. This vessel sends off small branches to supply blood to the thumb and index finger.

Superficial Palmar Arch
Also named for its shape of an arch, this vessel communicates with the deep palmar arch and also gives off important branches that supply blood to the fingers. These are called the common digital arteries.

Common Digital Arteries
The common digital arteries are small vessels that come from the palmar arches and supply blood to the fingers. They are called “common” because when they split to become the proper digital arteries, most of these vessels provide blood to two different fingers.

Digital Arteries to the Thumb
The thumb receives its blood supply from the digital arteries.

Proper Digital Arteries to the Fingers
The proper digital arteries stem from the common digital arteries, right where they split between the fingers. The split feeds blood to two different fingers. Each finger has two proper digital arteries that run on either side. If one of these vessels is injured, the others can usually maintain the blood supply to the entire finger.

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There are five major bones in the shoulder.

There are five major bones in the shoulder. The shoulder bones can easily be affected by falls or accidents, in addition to arthritis. Here is an overview of the shoulder bones. Types:

          Scapula

          Clavicle

          

          Coracoid Process

          Glenoid Cavity

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The “irregular bones” refers to bones that perform various body.

The “irregular bones” refers to bones that perform various bodily functions, including protecting nerve tissue and providing support for the pharynx and trachea. They belong to the group of vertebrae and hip bones (coaxial bone) and are categorised as neither long, short, nor flat...

come in various funky shapes and sixes,and they don't fit any of the other bone categories.

these bones also consist of a layer of spongy bone, covered by a thin layer compact bone.

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Short bones in the human body.

Short bones in the human body are often cube-like, their length, width, and height are all about the same.


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what is long bone and Long bone types.

Long bone the key characteristic is longer than they are wide. These bones are going to have a shaft made primarily of compact bone,and two bulky end,which often contain spongy bone.


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What are the 7 types of bones The bones of the human skeleton are classified by their shape long.

The bones of the human skeleton are classified by their shape: long bones, short bones, flat bones, sutural bones, sesamoid bones, and irregular bones There are typically around 270 bones in human infants, which fuse to become 206 to 213 bones in the human adult. The reason for the variability in the number of bones is because some humans may have a varying number of ribs, vertebrae, and digits.


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