Forearm Bones: Radius and Ulna

Question 1

Two forearm bones

Answer 1

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.

Question 2

Hand pronated (forearm bones)

Answer 2

The distal radius crosses the ulna

Question 3

Joint of the forearm bones

Answer 3

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.

Question 4

Radius and carpal bones

Answer 4

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

Question 5

Lateral Epicondyle

Answer 5

Located proximal to the capitulum

Question 6

Medial Epicondyle

Answer 6

Is found proximal to the trochlea

Question 7

Trochlea

Answer 7

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

Question 8

Olecranon Process

Answer 8

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

Question 9

Coronoid Process of the ulna

Answer 9

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

Question 10

Head of the Radius

Answer 10

Location:
Function: Articulates with the capitulum of the humerus

Question 11

Radial Notch of the Ulna

Answer 11

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

Question 12

Neck of the radius

Answer 12

Location: Distal to the head, radius narrows

Question 13

Radial Tuberosity

Answer 13

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

Question 14

Styloid Processes

Answer 14

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

Question 15

Styloid Process of the ulna

Answer 15

Function: attaches the ulnar collateral ligament of the wrist

Question 16

Styloid Process of the Radius

Answer 16

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

Question 17

Head of the Ulna

Answer 17

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

Question 18

Proximal Row of Carpal Bones

Answer 18

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

Question 19

Interosseous Border

Answer 19

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