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Bones of the upper limb
Fascia, vessels and nerves of the upper limb
Anatomy of the brachial plexus
Anatomy of the sternoclavicular and acromioclavicular joints
Anatomy of the glenohumeral joint
Anatomy clinical correlates: Clavicle and shoulder
Anatomy of the axilla
Anatomy clinical correlates: Axilla
Anatomy of the pectoral and scapular regions
Anatomy of the arm
Anatomy of the elbow joint
Anatomy of the radioulnar joints
Anatomy clinical correlates: Median, ulnar and radial nerves
Muscles of the forearm
Vessels and nerves of the forearm
Anatomy clinical correlates: Arm, elbow and forearm
Joints of the wrist and hand
Muscles of the hand
Anatomy clinical correlates: Wrist and hand
Joints are structures in which bones meet to either permit movement, or provide stability.
There are plenty of them in our upper limbs.
We’ve got the:sternoclavicular; the acromioclavicular; and the glenohumeral joints in the pectoral girdle; the elbow; the proximal and distal radioulnar joints in the forearm; the wrist joint; and the joints of the hand, which include the carpometacarpal, the intermetacarpal, the metacarpophalangeal, and interphalangeal joints.
So let’s get acquainted with the first two of these joints!
It is a saddle synovial type of joint, named so because the manubrial articulating surface is concave and the clavicular articulating surface is convex, so they fit together the same way that a cowboy sits on his horse’s saddle.
The joint has an articular disc that is firmly attached to the anterior and posterior fibrous joint capsule by the anterior and posterior sternoclavicular ligaments, as well as the interclavicular ligament.
Like any other synovial joint, the articular surfaces of the sternoclavicular joint are covered by the fibrous joint’s capsule which has 4 ligamentous thickenings, simply called ligaments, lined internally by a thin layer of synovial membrane.
The ligaments of the fibrous capsule are the anterior and the posterior sternoclavicular ligaments, which reinforce the joint capsule anteriorly and posteriorly; the interclavicular ligament which strengthens the sternoclavicular joint superiorly; and finally, there is the costoclavicular ligament, which anchors the inferior surface of the medial end of the clavicle to the 1st rib and its costal cartilage, providing stability to the sternoclavicular joint by limiting the elevation of the pectoral girdle.
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