Cubital articulation and radioulnar junctures

Question 1

Elbow joint

Answer 1

• Includes the hukmerus, ulna and radius
• Three independent parts formed: humeroradial artriculation, hemroulnar artriculation and the proximal radioulnar artriculation

Question 2

Humeroradial artriculation

Answer 2

• Links the capitulum humeri with the fovea capitis radii
• Spherical joint with three axis of movement
• Mobility limited by humeroulnar joint

Question 3

Humeroulnar artriculation

Answer 3

• links the capitulum humeri with the incisura trochlearis ulnae
• Trochlear joint - one axis

Question 4

Proximal radioulnar artriculation

Answer 4

• Circumferentia artricularis radii is inserted into the incisura radialis ulnae
• Incisura radialis ulnae is completed by a circular ligament / ligamentum anulare radii
• Wheel-joint - longitudinal axis of movement

Question 5

Joint capsule

Answer 5

• Attaches onto the humerus proximally from fossa radialis, fossa coronoidea and fossa olecrani
• Along the sides the attachment of the capsule is shifted distally so that both epicondyles of the humerus are located extraartricularly
• On ulna attached to the margins of incisura trochlearis
• On radius it descends distallly into the regiomn of collum radii - creating the recessus sacciformis
• Reinforced along the sides by ligamentum collaterale ulnare and ligamentum collaterale radiale running from both humeral epicondyles

Question 6

Movement of elbox joint

Answer 6

• Combining all three independent artriculations results in only 2 axial movements: - flexion/extension (in the humeroradial and humeroulnar artriculations) and supination/pronation (in the radoulnar artriculation)
• Middle position is found when the joint is pronated and lightly flexed

Question 7

Radioulnar junctions

Answer 7

• Artricularis radioulnaris proximalis, artricularis radioulnaris distalis and membrana interossea antebrachii