Distal radioulnar art, membrana interossea antebrachii and radiocarpal art.

Question 1

Membrana interossea antebrachii

Answer 1

• MIA is strengthened between the bodies of radius and ulna
• In the proximal part there is a strong fibrous band - chorda obliqua, which runs from tuberositas radii to processus coronoideus ulnae
• Links both antebrachial bones, restricts supination and serves as a plane for adjoining of numerous antebrachial muscles

Question 2

Distal radioulnar artriculation

Answer 2

• Caput ulnae (head) is connected with the incisura ulnaris radii (pit)
• Joint pit completed bz discus artricularis which attaches to the margins of the incisura ulnaris radii and to processus styloideus ulnae
• Joint capsule attached to margins of the joint surfaces
• Cylindrical joint (monoaxial) - enables pronation and supination
• Ulna is fixed during movement
• Movement of the joint is accompanied by concomminant movement in the elbow joint

Question 3

Radiocarpal joint

Answer 3

• Joint pit is the facies artricularis carpalis radii, extended ulnarlly using the discus artricularis from the distal radioulnar joint
• Joint head is formed by: os scaphoideum, os lunatum and os os triquetrum
• These three bones are joined together using ligamentua intercarpalia interossea
• Joint capsule attached to margins of joint surfaces