BONES OF THE FOREARM- ULNA
BONES OF THE FOREARM
- The forearm contain two bones :
- Radius
- Ulna.
- In contrast to humerus which grows at its proximal end, growing ends of radius-ulna are their distal ends.
ULNA
- It is the medial bone of forearm.
- Proximal end consists of coronoid & olecranon processes & a trochlear notch.
- Radial notch is present on lateral aspect of coronoid process & articulates with the head of the radius.
- Trochlear notch articulates with trochlea of humerus to form medial part of elbow joint.
- Distal end consists of head & styloid process.
- Head articulates with ulnar notch on distal part of radius.
MUSCLE ATTACHMENT TO ULNA
ORIGINS of:
- flexor digitorum profundus
- pronator teres,
- flexor pollicis longus (small ulnar head)
- flexor digitorum superficialis (small ulnar head)
- supinator
- abductor pollicis longus
- extensor pollicis longus
- extensor indicis
- pronator quadratus
INSERTIONS of:
- triceps
- anconeus
- brachialis
Exam Important
- Olecranon process of ulna helps in formation of Trochlear notch.
- Ossification center of upper end of ulna is united by 16 years.
- The treatment of choice of fracture of radius and ulna in a an adult is Only plates.
- Both ulnar fracture and head of radius is displaced anteriorly
- Superior radioulnar joint is Pivot joint.
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