Ulna Flashcards
Where is the ulna located in the body?
Forearm
What does the ulna sit between?
arm and carpals
In what direction does it articulate with the ulna notch of radius?
Distally
What else does it articulate with distally?
Articular disc (which separates it from carpals)
What does the distal articulations of the ulna provide?
Greater rotation of hand and radius around the ulna
What is the main non-metric trait?
Shape of the trochlear notch
What else does the ulna articulate with?
Humerus at thr olecranon
radius at radial notch and head
What side is the olecranon process found?
Posterior
What is on the internal surface of the olecranon process?
Trochlear notch
What two landmarks near the proximal end of the ulna have smooth articular surfaces?
Coronoid process
Radial notch
What crest comes off of the radial notch?
Supinator crest
What lines make the ulna a triangular cross section?
Posterior oblique line
What landmark/bony features sits below the coronoid process?
Tuberosity
What side is the interosseous crest found?
Lateral
Where is the head of the ulna?
Distal end
What bony feature is found at the bottom of the head?
Styloid process
What is the origin and insertion of triceps brachii?
Origin: radial sulcus of humerus and ifnrglenoid tubercle of scapula
Inserts: olecranon process
What movements does triceps brachii produce?
forearm extension and addcution
What is the origin and insertion of brachialis?
Origin:m inferior anterior diaphysis of humerus
Inserts: coronoid process and tuberosity of ulna
What movements does brachialis produce?
forearm flexion
What is the origin and insertion of pronator teres?
Origin: medial border of coronoid process of ulna (also medial epicondyle of humerus)
Inserts: lateral diaphysis of radius
What movements does pronator teres produce?
Forearm pronation and flexion
What is the origin and insertion of supinator?
Origin: supinator crest (also lateral epicondule of humerus)
Inserts: lateral proximal diaphysis of radius
What movements does supinator produce?
Forearm supination
What is the origin and insertion of pronator quadratus?
Origin: line on distal anterior and medial diaphysis of ulna
Inserts: distal anterior diaphysis of radius
What movements does pronator quadratus produce?
forearm and hand pronation
What is the origin and insertion of extensor carpi ulnaris?
Origin: notch on posterior distal end of ulna (lateral to styloid process and also from lateral epicondyle of humerus)
Inserts: 5th metacarpal
What movements does extensor carpi ulnaris produce?
hand extension
