Forearm (Ulna and Radius) Flashcards
Is the ulna located laterally or medially in the body?
Medial
The Coronoid process articulates with what part of the humerus?
Trochlea of the humerus
The Ulnar tuberosity is the attachment pint for which muscle?
Brachialis
What is the “elbow” that can be palpated?
olecranon process
What is the stabilizing bone of the forearm?
Ulna
Which side of the distal end of the ulna is the styloid process located?
Medial
Which bone reaches the wrist ONLY?
Radius
Does the radius have anything to do with the elbow joint?
No.
Describe the shape of the Ulna.
Larger towards the humerus, tapers downward to the wrist but does not touch the wrist joint.
What separates the 2 process of the ulna?
trochlear notch
What are the 2 processes of the proximal end of the ulna?
olecranon process and coronoid process
What is bursitis? How is it caused?
inflammation of the bursal sac, direct trauma or repetitive friction
What 2 structure lie between the elbow and the skin?
olecranon bursa and triceps tendon
Describe the shape of the radius.
Skinny proximally and enlarged distally.
The Ulnohumeral joint (elbow) is what type of joint?
Synovial Hinge (uniaxial)
How and why is there a carrying angle? How big is the carrying angle?
The trochlea is larger/thicker medially therefore the distal arm migrates laterally to accommodate the width of the hips. Usually the carrying angle is 15 degrees.
Is the radiohumeral joint part of the elbow?
no
Where does the radius articulate with the humerus?
Capitulum of the humerus
The medial collateral ligament of the elbow extends from where to where?
Medial epicondyle of the humerus to the top of the ulna
Which collateral ligament restricts a valgus stress?
Medial Lateral Collateral ligament (MCL)
A valgus force comes from which direction?
from lateral side pushing medially
Which collateral ligament extends from the lateral epicondyle to the annular ligament?
Lateral Collateral Ligament (LCL)
A Varus stress is restricted by which collateral ligament?
Lateral. (LCL)
A Varus force runs from which direction?
From the medial side and pushes laterally
What type of joint is the proximal radioulnar joint?
pivot joint
What is the annular ligament composed of?
ring of hyaline cartilage
What does the annular ligament do?
Holds the radial head into the radial notch and allows free rotation of the radius along its longitudinal axis
What is the intermediate radioulnar joint?
Interosseus Membrane
In which direction does the Interossues membrane run?
Inferiorly and medially
Structurally what type of joint is the intermediate radioulnar joint?
Fibrous (for stability)
What articulation forms the distal radioulnar joint?
Ulnar notch of the radius and the distal end of the ulna.
Which radioulnar joint allows for the radius to cross over the ulna in pronation/supination?
Distal radioulnar joint
What are the 3 radioulnar joint?
- Proximal
- Intermediate /Interosseus
- Distal
What is the structural classification of the intermediate radioulnar joint?
a) synovial
b) cartilaginous
c) fibrous
d) diarthroses
e) Synarthrosis
c) fibrous
In full elbow extension, what bony landmark makes contact with the radial fossa of the humerus?
a) olecranon process
b) trochlea
c) Capitulum
d) trochlear notch
e) radial head
e) radial head
