Ulna Flashcards
Ulna lies on which side of forearm?
Medial
What causes olecrannon fracture?
Fall on flexed elbow
Bony fragment displaced by pull of the tricep muscle which is inserted on the olecrannon process
Ulna articulates with humerus at?
Trochlea
What structure forms the point of the elbow?
The olecrannon process of ulna
Which muscle inserts into the olecrannon process?
Triceps brachii muscle
Where is coronoid process in ulna?
Inferior to olecrannon process and contributes the formation of trochlear notch
Ulnar tuberosity serves as an insertion site for which muscle?
Brachialis
Which muscles insert in radial and ulnar tuberosities?
1.Radial tuberosity- biceps brachii
2.Ulnar tuberosity- brachialis
Head of ulna is on which end?
Distal
Name the proximal bony landmarks of ulna?
- Olecrannon
- Coronoid process
- Trochlear notch
- Radial notch
- Ulnar Tuberosity
What two structures form parts of trochlear notch?
1.Olecrannon (proximal)
2.Coronoid process (distal)
On which surface of trochlear notch is radial notch?
On lateral surface
On the anterior surface of ulna, which muscle originates?
Pronator quadratus attaches distally
What is the most likely site of fracture for ulna?
Shaft
What happens in ulnar fracture?
Proximal ulna is pulled posteriorly
