Anatomy · MU Sofia

Bones and Muscles · 23. Elbow joint. Junctions of forearm bones.

Covers the elbow joint as a synovial hinge: its humeroulnar and humeroradial articulations, the fibrous and synovial capsule with its fat pads, and the radial collateral, ulnar collateral and annular ligaments, followed by the movements. It then describes the junctions of the forearm bones, namely the distal radio-ulnar joint with its triangular articular disc, its innervation and blood supply, the proximal radio-ulnar joint with its annular and quadrate ligaments, and the middle radio-ulnar fibrous joint with its interosseous membrane and oblique cord.

Inside: 7 sections · 6 labelled pictures · 12 flashcards · 3 min

Topic 23 of 264 in the MU Sofia syllabus for Anatomy (Dental Medicine, Year 2). The free AceMed note covers it in 7 sections, about 361 words (3 min of reading), with 12 flashcards.

In this note

  1. ELBOW JOINT
  2. Structure :
  3. Movements :
  4. JUNCTIONS OF THE FOREARM BONES
  5. Distal radio-ulnar joint : ↙ synovial piovet.
  6. Proximal radio-ulnar joint:
  7. Middle radio-ulnar joint :

ELBOW JOINT

  • The elbow joint is a synovial hinge joint, connecting the arm to the forearm.
  • Consists of 3 bones : Humerus, the ulna & the radius.

Structure :

Articular Surfaces:

  • Humeroulnar joint - between the trochlea of the humerus & the trochlear notch of the ulna.
  • Humeroradial joint : Between the capitulum of the humerus and the head of the radius.

Capsule :

  • The fibrous membrane :
  • Above, it is attached to the humerus above the level of coronoid, radial, & olecranon fossae.
  • Below, It is attached to the margins of coronoid & olecranon processes of ulna & annular ligament around the head of radius.
  • The synovial membrane :

Is separated from the fibrous membrane by pads of fat in regions overlying the coronoid fossa, the olecranon fossa & the radial fossa.

→ These fat pads to accommodate (احتواء) the related bony processes during extension & flexion of elbow.

Ligaments:

  1. 1. Radial collateral ligament (lateral side)
  2. 2. Ulnar collateral ligament (Medial side)
  3. 3. Annular ligament (surrounds the radial head)

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