Flashcards in Joints Of Upper Limb 475-481 Deck (22)
Movement at the pectoral girdle...(3 joints)
Involves the sternoclavicular, acromioclavicular, and glenohumeral joints, usually moving simultaneously.
For every 3 degrees of elevation, approximately 2 degrees occurs at the glenohumeral joint and 1 degree at the scapulothoracic.
The sternoclavicular(sc) joint is a _____ _____ joint, but function as a _______ joint.
Synovial saddle joint but functions as a ballandsocket joint
The articular disk of the sc joint serves as....
A shock absorber of forces transmitted from the upper limbs along the clavicle
The disk is firmly attached by an anterior and posterior ligaments, as well as an inter clavicular ligament
The joint capsule of the sc joint
The fibrous layer of the capsule is attached to the margins of the articular surfaces
A synovial membrane lines internal surfaces of the fibrous layer of the capsule
The interclavicular ligament strengthens ....
The joint capsule of the sc joint superiorly
Anchors the clavicle to the first rib and its costal cartilage, limiting elevation of the pectoral girdle
Acromioclavicular (ac) joint
Is a plane synovial articulation
The AC ligament
Fibrous band expending from the acromion to the clavicle, strengthening the ac joint superiorly
Most of the joint strength comes from the coracoidclavicular ligament
Subdivided into conoid and trapezoid ligaments
In addition to augmenting the ac joint, the coracoclavicular ligament provides the means by which the scapula and free limbs are passively suspended from the clavicle
Apex is Attached to the roof of the coracoid process and the base attachment is to the conoid tubercle on the inferior surface of the clavicle
The nearly horizontal Trapezoid ligament
Is attached to the superior surface of the coracoid process and extends laterally and posteriorly to the trapezoid line on the inferior surface of the clavicle
Please listen to me
Pec lateral teres medial
Coraco-acromial arch overlies the head of the humerus, preventing
its superior displacement from the glenoid cavity
The glenohumeral joint is supplied by
The anterior and posterior circumflex arteries and branches of the suprascapular
What are string fibrous thickenings of the joint capsule?
One of the ulnar collateral ligs
Deeps the trochlea
Distal Ulnar collateral ligament
Attaches to ulnar styloid process and triquetrum
Distal radial collateral ligament
Attaches to radial styloid process and scaphoid
Collateral ligs pass posterior to joint axis for flexion extension
Taut at 70-90 deg of flexion
When mcp joint in extension the ligs are relaxed. If immobilized for long time they will have a hard time flexing and making a fist
Mcp joint blood supply
Deep digital arteries arising from superficial palmar arches