UL Concept D Flashcards
What are the 3 articulations of the shoulder area?
Sternoclavicular
Scapuloclavicular (acromioclavicular)
Glenohumeral
What are the 3 articulations of the elbow and forearm area?
Humeroulnar
Humeroradial
Radioulnar (proximal)
What are the 2 articulations of the wrist area?
Radiocarpal
Radioulnar (distal)
Attributes of sternoclavicular joint are…
Extremely strong
Remains mobile
Is scapuloclavicular joint weak or strong?
Weak
What reinforces scapuloclavicular joint?
Trapezius muscle fibers
More importantly, the coracoclavicular ligament
Attribute of coracoclavicular ligament is…
It’s the main stabiliser backed with clavicle and scapula.
Function of coracoacromial arch/ligament is…
Prevent superior dislocation of head of humerus.
What articulates for glenohumeral ligament?
Glenoid cavity of scapula and head of humerus.
What is the structure that surrounds the glenoid cavity to create a bit if a deeper socket?
Glenoid labrum
What are the ligaments that attaches the actual shoulder joint called?
Glenohumeral ligaments
Where do glenohumeral ligaments attach from/to?
Margin of glenoid cavity and labrum to anatomical neck of humerus
Shoulder joint loose or strong?
Loose
Why is the shoulder joint weak inferiorly?
No rotator cuff
Laced when arm is adducted
Prone to dislocation
The glenohumeral joint capsule is lined by…
Synovial membrane
The articular surface of glenohumeral joint is…
Hyaline cartilage
What are some muscle actions at the shoulder?
Abduction
Flexors
Extensors
Which muscle initiates abduction? Which muscle is the primary abductor?
Supraspinatus
Deltoid
Is the fibrous elbow capsule weak?
Yes
What strengthens elbow fibrous capsule?
Lateral and medial collateral ligaments.
What are the 2 articulations at the elbow?
Humeroulnar
Humeroradial
What are the articulations of humeroulnar?
Trochlea of ulna
Trochlear notch of humerus
What are the articulations of humeroradial joint?
Capitulum of humerus and head of radius
What is humeroradial joint reinforced by?
Anular ligament
What ligament helps with pronation and supination?
Anular ligament
For the ulnahumeral joint, which flexors cross Anteriorly?
Brachialis
Biceps brachii
Brachiradialis
For the ulnahumeral joint, which extensors cross posteriorly?
Triceps brachii
Brachialis flexes (anteriorly to ulnahumeral joint)…
In all positions
Biceps brachii flexes (anteriorly to ulnahumeral joint)…
Supinated
Brachioradialis flexes (anteriorly to ulnahumeral joint)…
Mid-pronated
What actions are permitted with radiohumeral joint?
Flexion/extension
Pronation/supination
What muscle causes pronation at radiohumeral
Joint?
Pronator teres
What muscle causes supination at radiohumeral
Joint?
Biceps brachii
What are the 3 joints of the forearm?
Proximal
Distal
Interosseous membrane
What action does Proximal joint, Distal joint, and
Interosseous membrane at forearm support?
Pronation and supination
What bones participate in radiocarpal joint?
Scaphoid
Lunate
Triquetreum
& Radius
What bone doesn’t participate in radiocarpal joint?
Ulna
What is ulna and radiocarpal joint excluded by?
Fibrocartilaginous disc
What are the supporting ligaments of radiocarpal joint?
Radial collateral
Ulnar collateral
What does radial collateral do?
Limits adduction
What does ulnar collateral do?
Limits abduction
What action does radiocarpal joint permit?
Flexion/ extension
Adduction
Abduction
What causes flexion of radiocarpal joint?
Flexors (carpi’s, of digits)
Palmaris longus
What causes extension of radiocarpal joint?
Extensors (carpi’s, of digits)
What causes adduction of radiocarpal joint?
Extensor and flexor carpi ulnaris
What causes abduction(to undo adduction) of radiocarpal joint?
Extensor and flexor carpi radialis
