Radio-Ulnar Joint Anatomy and Functions

Dr. Hassan explains the radio-ulnar joints, focusing on the superior, middle, and inferior joints. The superior and inferior joints are pivot synovial joints, while the middle joint is a syndesmosis type. The superior joint involves the head of the radius and the radial notch of the ulna, with key ligaments like the annular and quadrate ligaments. The inferior joint features the head of the ulna and the ulnar notch of the radius, with a triangular articular disc. Blood and nerve supplies are discussed, along with the movements of supination and pronation.

Which bones form the radio-ulnar joints?

• Radius and ulna

• Humerus and ulna

• Ulna and femur

• Radius and humerus

What type of joint is the superior radio-ulnar joint?

• Hinge joint

• Ball and socket joint

• Pivot joint

• Saddle joint

Which ligament is most important in the superior radio-ulnar joint?

• Cruciate ligament

• Annular ligament

• Quadrate ligament

• Collateral ligament

What movements are allowed by the superior radio-ulnar joint?

• Flexion and extension

• Inversion and eversion

• Abduction and adduction

• Supination and pronation

Which joint type allows for rotatory movements like supination and pronation?

• Pivot joint

• Ball and socket joint

• Hinge joint

• Saddle joint

What is the shape of the articular disc in the inferior radio-ulnar joint?

• Square

• Triangular

• Circular

• Oval

Which nerve supplies the inferior radio-ulnar joint?

• Ulnar nerve

• Anterior and posterior interosseous nerves

• Median nerve

• Musculocutaneous nerve

What type of joint is the inferior radio-ulnar joint?

• Ball and socket joint

• Pivot joint

• Hinge joint

• Saddle joint

What type of joint is the middle radio-ulnar joint?

• Synchondrosis

• Symphysis

• Syndesmosis

• Synovial

What structure forms the middle radio-ulnar joint?

• Articular cartilage

• Interosseous membrane

• Fibrocartilage

• Ligamentum flavum