Dissection 24 (Joints of upper limb) 2
Terms
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- What is the joint of the elbow?
- Humeroulnar
- What bony portions of the ulna in involved in humeroulnar joint?
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olecranon-more proximal and posterior portion fits into the olecranon fossa of humerus
coronoid process-distal to the olecranon forms distal border of the trochlear notch of the ulna
Trochlea of the humerus-articulates on the trochlear notch of the ulna - What type of joint is the humeroulnar joint? (structure and movement)
- synovial uniaxial
- What type of joint is the Proximal radioulnar joint?
- synovial uniaxial
- What type of joint is the humoradial joint?
- synovial
- What movements occur within the proximal radioulnar joint?
- Pronation and supination
- What are the bony articulations of the proximal RU joint?
- Head of radius and radial notch of ulna
- What are the bony articulations of the humeroradial joint?
- concavity of the radial head and the Capitulum of the humerus
- What does the annular ligament surround?
- The radial head, it hold the radial head to the ulna
- What does the radial collateral ligament attach?
- Epicondyle of the humerus to the anular ligament of the radius
- What movements does the radial collateral ligament prevent?
- Adduction and hyperextension (along with the ulnar collateral)
- Describe the ulnar collateral ligament?
- It attaches in a triangular fashion the medial epicondyle, the olecranon, and the coronoid process.
- What portions of the elbow capsule are particularly weak?
- Anterior and posterior portions
- What is often fractured in a dislocated elbow?
- Coronoid
- What type of joint is the middle radioulnar joint?
- syndemosis
- What forms the middle radioulnar joint?
- Interosseous membrane
- In what direction do the fibers of the interosseous membrane run?
- obliquely upward from ulna to radius
- What bone bears most of the weight at the wrist (radius or ulna)?
- Radius
- Which bone (radius or ulna) bears most of the weight of a fall in the elbow?
- Ulna
- What bony articulations are involved in the distal radioulnar joint?
- Distal end of the ulna and the ulnar notch of the radius
- What type of joint is the distal RU joint?
- Synovial
- Going fron proximal to distal how does the type of joint change in the radioulnar joints?
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Proximal radioulnar is synovial
Middle is syndesmosis
Distal is synovial