Shoulder

The human shoulder is made up of three bones: the clavicle (collarbone), the scapula (shoulder blade), and the humerus (upper arm bone) as well as associated muscles, ligaments and tendons. The articulations between the bones of the shoulder make up the shoulder joints. The major joint of the shoulder is the glenohumeral joint, which "shoulder joint" generally refers to. In human anatomy, the shoulder joint comprises the part of the body where the humerus attaches to the scapula, the head sitting in the glenoid fossa. The shoulder is the group of structures in the region of the joint.

There are two kinds of cartilage in the joint. The first type is the white cartilage on the ends of the bones (called articular cartilage) which allows the bones to glide and move on each other. When this type of cartilage starts to wear out (a process called arthritis), the joint becomes painful and stiff. The labrum is a second kind of cartilage in the shoulder which is distinctly different from the articular cartilage. This cartilage is more fibrous or rigid than the cartilage on the ends of the ball and socket. Also, this cartilage is also found only around the socket where it is attached.

The shoulder must be mobile enough for the wide range actions of the arms and hands, but also stable enough to allow for actions such as lifting, pushing and pulling. The compromise between mobility and stability results in a large number of shoulder problems not faced by other joints such as the hip.

Read more about ShoulderEvolutionary Variation, Additional Images

Other articles related to "shoulder":

Beverly Kenney - Death and Legacy
... collections of unreleased Beverly Kenney material Snuggled on Your Shoulder (2006), Lonely and Blue (2007), and What Is There To Say? (2009) ... This first in the series, Snuggled on Your Shoulder, was reissued by Cellar Door Records in 2010 it features the SSJ Records release in its entirety plus bonus tracks ... One track from Snuggled On Your Shoulder, "Tea For Two", was released on the Vintage music compilation, This is Vintage Now (2011) ...
Canadian Silver Dollar - Varieties - No Shoulder Fold Obverse
... are commonly identified as the No Shoulder Fold and the Shoulder Fold ... The centre portion of the effigy was to feature two lines on the shoulder ... very well, it was commonly termed the No Shoulder Strap by many collectors ...
Shoulder Pads
... Shoulder pads are a piece of protective equipment used in many contact sports such as American football, Canadian football, lacrosse and hockey ... Most modern shoulder pads consist of a shock absorbing foam material with a hard plastic outer covering ... Shoulder pads are fitted to an adult football player by measuring across the player's back from shoulder blade to shoulder blade with a soft cloth tape measure and then adding 1/2 inch ...
Shoulder Mark
... A shoulder mark, also called a shoulder board, shoulder loop, shoulder slide, rank slide, shoulder strep, epaulette sleeve, or an epaulette, is a flat cloth sleeve worn on the ... Sources disagree as to whether a shoulder board and an epaulette are the same thing ...
Shoulder - Additional Images
... The left shoulder and acromioclavicular joints, and the proper ligaments of the scapula Instrumented shoulder endoprosthesis, with a 9-channel telemetry transmitter to measure six load ...

Famous quotes containing the word shoulder:

    America I’m putting my queer shoulder to the wheel.
    Allen Ginsberg (b. 1926)

    The white American man makes the white American woman maybe not superfluous but just a little kind of decoration. Not really important to turning around the wheels of the state. Well the black American woman has never been able to feel that way. No black American man at any time in our history in the United States has been able to feel that he didn’t need that black woman right against him, shoulder to shoulder—in that cotton field, on the auction block, in the ghetto, wherever.
    Maya Angelou (b. 1928)

    He saw her from the bottom of the stairs
    Before she saw him. She was starting down,
    Looking back over her shoulder at some fear.
    Robert Frost (1874–1963)