Bones have plenty of shapes and sizes and are vital to add structure to the body and protection to the critical structures. The bones have a crystalline building and construction embedded v mineral and also live cells that maintain and repair the skeleton.

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Bones have plenty of shapes and also sizes and also are essential to include structure come the body and protection to the an important structures. The bones have actually a crystalline building and construction embedded v mineral and live cells the maintain and repair the skeleton.

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Shoulder Bones

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Scapula

The scapula, or “shoulder blade,” is an about triangular shame bone. It, essentially, floats turn off of the back of the chest, as it is linked to the body mainly by muscle. In fact, there are 17 muscles that connect to the scapula. The scapula has a joint the wraps approximately from the ago to the prior of the shoulder dubbed the acromion. The acromion is the part of the scapula the attaches to the collar bone and also is the only true share attaching the arm to the body. Lot of the activity of the shoulder is actually motion between the scapula and also the chest. Because of this, the main shoulder joint (called the glenohumeral joint), the scapula, and the surrounding muscle and ligament are jointly referred to together the shoulder girdle. The shoulder girdle combines to provide you shoulder motion. Injuries come the scapula room usually from an awkward fall or automobile accident.

Clavicle

The clavicle, or “collar bone,” is a lengthy slightly bent bone that connects the arm to the chest. In most people, the clavicle is basic to feel and also even see under the skin. The clavicle attaches to number of muscles connecting it to the arm, the chest and the neck. There space two ends with joints on the clavicle, and these can come to be arthritic in some people. Clavicle fractures frequently happen ~ a autumn or other far-ranging trauma.

Acromion

The acromion is a relatively flat estimate of the scapula the curves about from the earlier to the prior of the shoulder. Lot of the strong deltoid muscle roughly the shoulder attaches come the acromion. This bone also gives the shoulder much of its nearly squared-off shape. In some people there is one extra piece of bone that, throughout development, did not fuse to the rest of the acromion. This is dubbed an os acromiale. Occasionally the os acromiale can cause discomfort. However, most typically it walk not reason a a problem. Lie under the acromion, there is a great of bursa tissue and also some that the rotator cuff. Some human being have a curve or hook to the underside the the acromion near the rotator cuff tendons. Operated doctor sometimes indicate removal that the curve or hook at the moment of surgery.

Coracoid Process

The coracoid process is a forecast off the the scapula the points right out to the prior of the body. This piece of the scapula bone is important since it has actually muscles and ligaments fastened that assist hold the clavicle, the shoulder joint, and also humerus. There space ligaments native the coracoid that assist keep the clavicle in place; these have the right to be take it in part AC (acromioclavicular) joint dislocations. Among the top of the biceps attaches to the coracoid. The coracoid typically does not cause pain or have actually injuries yet can occasionally be a cause for shoulder discomfort.

Glenoid cavity

The glenoid is the socket part of the ball and socket joint of the shoulder (glenohumeral joint) and is component of the scapula. It is relatively flat which permits the share to it is in the many mobile joint in the body. The glenoid cavity includes the glenoid’s bone and cartilage surface, and it combines v soft tissues favor the glenoid labrum, lot of shoulder ligaments and also the share capsule (the lining that the joint) to do the share stable. When the joint is normally stable, several motion, injury or abnormality in any of the structures of the glenoid cavity have the right to lead to joint instability. Occasionally, the shoulder have the right to lose activity from problems such together arthritis or adhesive capsulitis (frozen shoulder).

Arm Bones

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Humerus

The humerus is the lengthy bone in between the shoulder and also the elbow. It has the sphere of the ball and also socket of the shoulder (glenohumeral) joint. At the various other end, it has its section of the elbow joint. The humerus serves as an attachments of numerous muscles and also ligaments in the arm. Some of the enclosed muscles run all the means into the hand. The humerus commonly becomes a difficulty only as soon as it division (fractures). There are many species of humerus fractures and as a result, the therapies for these fractures are rather variable.

Radius

The radius is one of the two forearm bones and is top top the thumb side that the forearm close to the hand, however is constantly on the exterior of the elbow. The place of the radius transforms depending on just how the hand is turned due to the fact that the radius twists about the various other forearm bone, the ulna. In ~ the elbow, the radius is component of the odd shaped joint between the humerus and also the 2 forearm bones. The joint between the radius and humerus by itself is prefer a ball and also socket joint, with the radius creating the socket. The radius has countless muscular attachments to move the elbow, forearm, wrist and fingers. The end of the radius leader to the wrist joint. The radius and also ulna space joined by cartilage joints in ~ the elbow and also at the wrist. Castle are likewise joined by many ligaments. There are many ways that civilization injure the radius and also the forearm. Breaking this bone is common because when we fall, the hands and arms are typically used to break the fall.

Ulna

The ulna is one of the two forearm bones and also is on the small finger side of the forearm. Unlike the radius, this bone does no twist, so when the hand alters position, the ulna is constantly in the same position on the inside component of the forearm. Favor the radius, the ulna has joints in ~ the elbow and also wrist. The joint between the ulna and humerus is a hinge type of joint. At the wrist, the ulna has actually a smaller sized surface in call with the wrist bones and typically bears less of the pressure from the hand and wrist. The ulna is join to the radius transparent the forearm v cartilage joints in ~ the elbow and wrist and multiple ligaments connecting to the radius through the totality length of the forearm. Like the radius, break the ulna bone is a usual reason for troubles with the ulna.

Wrist Bones

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Scaphoid

The scaphoid is a bone in the wrist. That is part of the very first row of wrist bones, however it helps to link the 2 rows that wrist skeleton together. Its name derives native the Greek word for boat because it’s thought that the scaphoid each other a boat. Many of the scaphoid is covered with cartilage i beg your pardon contacts five other skeleton in the wrist and forearm. The component of the scaphoid without cartilage is attached to ligaments and also has blood vessels the come native the radial artery. Bones require blood flow to heal. A broken or fractured scaphoid can have an obstacle healing, or might never heal, since of a disruption that blood flow through the scaphoid. An undamaged scaphoid is important and necessary for appropriate wrist function because of how it interacts through the other wrist bones.

Lunate

The lunate is a bone in the center of the wrist in the an initial row that wrist bones. Like most of the wrist bones, it is practically entirely extended in cartilage. This bone has actually a crescent shape when seen native the side and also its large cartilage surface allows for far-ranging wrist motion. It is unusual to break the lunate, yet the lunate deserve to be involved with dislocations of the wrist and can rub versus the ulna if the ulna is also long contrasted to the radius bone.

Triquetrum

The triquetrum is a bone top top the small finger side of the wrist in the first row the wrist bones. This bone adds stability to the wrist, gives the wrist a bigger surface come bear weight transmitted native the hand, and also makes a share with various other carpal bones including the pisiform.

Trapezoid

This is a about trapezoidal-shaped bone in the second row that wrist bones and primarily stop the index finger metacarpal bone in place. This bone is uncommonly injured.

Trapezium

The trapezium is a saddle-shaped bone in the 2nd row the wrist bones, and also it is the main ar where the thumb metacarpal connects come the wrist. This bone has an odd shape that permits the thumb to move in lot of directions, yet it stabilizes ignorance as well. There room two main troubles seen through this wrist bone. Breaking (fracturing) the bone is common, yet the most common problem is arthritis in between the trapezium and also the bones the sits alongside in the wrist and thumb.

Capitate

The capitate is a large bone in the center of the 2nd row that wrist bones. It creates joints with multiple bones in the wrist and hand. That sits mainly under the middle finger metacarpal bone. This bone makes an essential contribution come wrist motion.

Hamate

The hamate is a large, unusually shaped, bone that has actually an almost triangular shape as soon as seen native the top and is located in the second row that wrist bones. As with the other wrist bones. That serves as attachment points for multiple ligaments and works v multiple various other bones. It is among the attachments points because that the ligament associated in carpal tunnel syndrome. That holds increase the ring and tiny finger metacarpal bones. The hamate have the right to be hurt in more than one way. Frequently, the hamate have the right to break when human being use the hand for punching. Also, the hook of the hamate have the right to fracture throughout a fall or if win directly, such as as soon as a baseball player ferris wheel a bat or golfer swings a golf club.

Pisiform

The pisiform is a small sesamoid bone (a bone in ~ a tendon) that sits in the wrist and is in the flexor carpi ulnaris tendon. Like various other sesamoid bones, it alters the direction of pull of the tendon to which the is attached. Occasionally, the pisiform deserve to break or have the right to have arthritis in the joint it makes with the triquetrum.

Hand and Finger Bones

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Finger Metacarpals

The metacarpals that the fingers consist of the bone framework of many of the hand. They room all similar in shape and also have joints in the wrist top top one end, and also the finger in ~ the various other end. The index and middle finger metacarpals have very small motion, while the metacarpals that the ring and little finger move much more.

Proximal phalanges

The proximal phalanx that the fingers is the proximal, or an initial bone, in the fingers as soon as counting native the hand to the tip of the finger. There room three phalanges in each finger. The proximal phalanx is the biggest of the 3 bones in each finger. The proximal phalanx has joints v the metacarpal and with the middle phalanx.

Middle phalanges

The center phalanx the the finger is the center or 2nd of the 3 bones in every finger when counting from the hand come the reminder of the finger. The center phalanx has actually joints with the proximal phalanx and also with the distal phalanx that the finger.

Distal phalanges

The distal phalanx of the finger is the distal or 3rd of the 3 bones in every finger once counting native the hand come the tip of the finger. The distal phalanx has a joint just with the center phalanx. Top top the tip of the phalanx is a bulbous tuft the bone the helps offer the finger the rounded appearance. The distal phalanx is likewise important for sustaining the fingernail.

Thumb metacarpal

The thumb metacarpal is comparable in shape to the metacarpals the the fingers, yet it is thicker. The thumb metacarpal has actually significantly more motion than the various other metacarpals. It provides a joint v the trapezium that allows much that the thumb motion. This joint allows the thumb to relocate in a method that enables pinching. This is largely because of the unusual shape of the basic of the metacarpal and the trapezium. The head of the metacarpal has actually a huge joint surface alongside the thumb proximal phalanx.

Thumb sesamoids

The ignorance sesamoids room two small round bones at around the level the the thumb metacarpophalangeal joint these bones, similar to all sesamoid bones, lie in ~ tendons. The flexor pollicis brevis tendon and the adductor pollicis affix to the thumb sesamoids. Sesamoid bones help adjust the heat of pull for their tendons which can assist increase the pressure of tendon pull throughout the joint.

Thumb proximal phalanx

The thumb proximal phalanx is a short and stout bone in between the metacarpal and distal phalanx. There is no middle phalanx in the thumb.

Thumb distal phalanx

The thumb distal phalanx is a short bone with a rounded tuft at the finish that renders a joint with the proximal phalanx. The bulbous tuft at the end of the bone offers the thumb its rounded end. This bone supports the ignorance nail.

Elbow Bones

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Coronoid process

The coronoid process is a little projection of bone turn off of the ulna bone the sits in the front of the elbow and also on the within of the elbow on and very near the coronoid procedure are attachment sites because that muscles and also ligaments that the elbow joint. The coronoid process is vital for including stability to the elbow.

Radial head

The radial head is a somewhat rounded cup that joins with the humerus and also ulna to consist of a part of the elbow joint. The radial head has actually cartilage surfaces for both the humerus and the ulna to enable bending and extending of the elbow and also twisting the the forearm. It additionally can include a far-ranging amount of security to the elbow joint.

Radial tuberosity

The radial tuberosity is a small, smooth projection on the surface ar of the radius bone near the elbow. It is the attachment website for the biceps tendon in the forearm. Because of the position of the tuberosity ~ above the radius, the biceps tendon twists the hand palm up the forearm.

Lateral epicondyle

The lateral epicondyle is a bone forecast off the the exterior of the humerus bone. It is vital primarily because of the soft tissue attachments come ligament and also tendon.

Medial epicondyle

The medial epicondyle is a bone projection of the within of the humerus bone. The is important primarily because of the soft tissue attachments come ligament and also tendon. The ulnar collateral ligament and also the typical flexor tendon affix here. The ulnar nerve runs automatically behind the medial epicondyle.

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Olecranon

The olecranon is a huge projection the bone top top the back of the elbow. That is a component of the ulna bone and also makes the allude of the elbow.