Forearm Bones: Radius and Ulna Flashcards Preview

Anatomy Exam 3 > Forearm Bones: Radius and Ulna > Flashcards

Flashcards in Forearm Bones: Radius and Ulna Deck (19)
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Two forearm bones

Location: parallel to each other when the limb is in the anatomical position, with the palm facing forward (Supinated)
Radius is located on the lateral side
Ulna on the medial side.


Hand pronated (forearm bones)

The distal radius crosses the ulna


Joint of the forearm bones

Distal humerus forms a hinge joint with the proximal unlla and radius, while the radius articulates with the ulna both proximally and distally to permit rotation of the hand.


Radius and carpal bones

Articulates with the proximal row of the carpal bones, while the shorter ulna does not participate in direct union with the hnad.


Lateral Epicondyle

Located proximal to the capitulum


Medial Epicondyle

Is found proximal to the trochlea



Function: articulates with a half moon-shaped hollow of the ulna known as the semiulnar (trochlear) notch


Olecranon Process

Location: Expanded proximal end of the ulna, extends into the olecranon foss of the humerus


Coronoid Process of the ulna

Location: Distal to the semilunar notch
Function: Projection of bone where the powerful brachialis muscle attaches


Head of the Radius

Function: Articulates with the capitulum of the humerus


Radial Notch of the Ulna

Function: Permit both flexion/extension of the elbow and rotation of the hand in pronation/ supination as the forearm bones cross


Neck of the radius

Location: Distal to the head, radius narrows


Radial Tuberosity

Location: Below the neck
Function: the attachment of the biceps brachii tendon


Styloid Processes

Location: Disal ends of the radius and ulna found on either side of the wrist
Function: Pen like extensions of bone


Styloid Process of the ulna

Function: attaches the ulnar collateral ligament of the wrist


Styloid Process of the Radius

Function: attaches to the brachioradialis muscle and the radial collateral ligament of the wrist


Head of the Ulna

Location: Expanded distal end of the ulna,
Function: Covered with hyaline cartilage to form the distal radio-ulnar joint


Proximal Row of Carpal Bones

Location: Radius directly joins here
Function: Permit movements of the hand


Interosseous Border

Location: Shafts of the radius and ulna face each others, sharp edge of bone
Function: Attaches to the interosseous membrane, suspended btwn these two bones
Same arrangement exists in the paired bones of the leg, tibia and fibula facing one another in order to attach the intervening interosseous membrane