FOREARM RADIUS AND ULNA
The distal end of the radius is _________ than the ulna and terminates with radial styloid process.
Larger
Where does the elbow joint capsule attatch proximally?
Above the trochlear fossa posteriorly and the trochlear notch anteriorly
Valgus
Angled inwards
Varus
Angled outwards
This ligament encircles the radial head like a collar.
Annular ligament
Why is the carrying angle greater in females?
Because of the wider pelvic girdle.
During elbow flexion the head of the radius GLIDES on the _________.
Capitulum
The radial head articulates with what bony landmark of the distal humerus?
Capitulum
Radial head articulates with the inferior __________ of the distal humerus during elbow __________.
Capitulum, extension
The bony landmark inferior to the trochear notch is _________.
Coronoid process
The elbow joint capsule attaches distally below the ___________ of the ulna.
Coronoid process
The radius Articulates __________ with the carpals bones of the wrist.
Directly
What aspect of the radius crosses over the ulna?
Distal
The ____________ joint allows for crossing over of the radius on the ulna during pronation.
Distal radioulnar joint
The olecranon process of the ulna is locked in the olecranon fossa of the distal humerus during elbow_________.
Elbow extension
The Ulna articulates directly with the carpals of the wrist joint.
False, the ulna does NOT articulate with the carpals of the wrist joint.
The annual ligament allows ______ of the radius along its longitudinal axis.
Free rotation
The carrying angle in females is __________ than males.
Greater
Significance of carrying angle?
Helps clear the hips when walking and important when carrying objects.
What is bursitis? and how can it be caused?
Inflammation of the bursa and it is caused by direct trauma or repetitive friction.
What joint lies between the shafts of the radius and ulna?
Intermediate radioulnar joint
What fibers run between the shafts of the raisins and the ulna?
Interroseus membrane
what structure prevents friction between the olecranon process of the ulna and the skin?
Olecranon bursa
What is the bony landmark of the ulna that is shaped like a wrench?
Olecranon process
How does a pivot joint work?
Pivot joints allow for the joint to rotate along an axis
When does the radius cross over the ulna?
Pronation
The following must be in place for pronation and supination to occur.
Pronation/supination mechanism
The ____________________ disc between the ulna and radius.
Triangular fibrocartilage
The ________ portion of the radius and the ulna always stays side by side.
Proximal
what joint helps the radius spin on Capitulum of the humerus?
Proximal radio ulnar joint
What ligament of the elbow prevents varus stress?
Radial collateral ligament
Explain the pronation/supination mechanism.
Radial head is locked in the annular ligament. Ulna is fixed in the olecranon fossa and radius spins proximally on the Capitulum and crosses over the ulna distally
What is the thickening on the anterior aspect of the radius?
Radial tuberosity
What bone is found lateral to the ulna?
Radius
What is the structural clalssification of the joint?
Synovial and it is a hinge joint (flexion extension
What occurs during full flexion of the elbow?
The coronoid process of the ulna sits in the coronoid fossa of the humerus.
The Trochlea is________ medially.
Thicker
The inner portion of the "wrench" is called the _________.
Trochear notch
What bone creates the carrying angle?
Trochlea
_______is thicker medially.
Trochlea
During elbow extension the Trochlea of the distal humerus still slides on the _______ of the ulna.
Trochlear notch
During elbow flexion the trochear notch fits into the ___________ of the humerus.
Trochlear surface
Between the radius and the ulna, which bone is more important to the elbow joint?
Ulna
What ligament of the elbow prevents Valgus stress?
Ulnar collateral ligament
The distal head of the ulna is small and ends as the ________ process.
Ulnar styloid process
The correct name for the elbow joint is__________
Ulnohumeral joint.
