UE: Radius and Ulna Flashcards
What does the head of the radius articulate with?
The capitulum of the humerus.
What is the radius?
The radius is a lateral forearm bone, thumb side.
_______of the radius allows for pronation and supination of the forearm.
Pivoting of the radius allows for pronation and supination of the forearm.
Are the radius and the ulna firmly attached? Why is this important?
The radius and the ulna are not firmly attached. This is important because it allows for pivoting- pronation and supination.
Muscles responsible for pronation and supination must insert on the radius.
T/F
True
What type of joint is the styloid process?
hinge joint
What is the styloid process?
Wrist joitn formed between the carpals and the distal radius.
Are the ulna and radius firmly attached?
Yes
What is the ulna?
The ulna is a medial forarm bone, pinky side.
What is the trochlear notch of the ulna?
Trochlear of radius and trochlear notch of ulna connect together to form a hinge
Allows for rotation
Know the structures
What is the olceranon process of the ulna?
It fits into the the olecranon fossa when the elbow is flexed.
What type of movement does the trochlear notch (where the radius and ulna connect)?
hinge joint
allows for rotation
What type of joint does the olecranon process of the ulna have with the humerus?
hinge type joint
What type of action does the coronoid process of the ulna allow for?
Flexion and extension
cannot pivot because locked on place
prevents overextension of elbow
Radius and ulna are held together by ___________.
Radius and ulna are held together by ligaments.
Helps divide forearm into anterior and posterior muscle compartments.
The radius and ulna are totally disconnected.
False-
an interosseous membrane (sheet-like) that hold radius and ulna together.
How the radius and ulna positioned relative to each other in supination?
Radius and ulna are paralled to each other in supianation.
The radius cannot move and is locked in place.
T/F
Fale
The radius is NOT located into place.
It can pivot around the humerus.
It can pivot across the ulna.
