Forearm, Wrist and Hand Flashcards
Where is the Head of the Ulna?
Shaft of the Ulna swells to form the Head of the Ulna.
Is the superficial knob visible along the posterior/medial side of the wrist.
Where is the Shaft of the Ulna?
Extends from the olecranon process to the head of the Ulna.
Has a superficial palpable edge that runs along the forearm’s posterior/medial aspect.
Where is the Ulnar Styloid Process?
Located on the posterior/medial side of the wrist.
Toothlike projection pointing distally off the head of the Ulna.
Where is the Head of the Radius Located?
Distal to the humerus’ lateral epicondyle.
Forms the radius’ proximal end and has a circular, bell shape.
Where is the Shaft of the Radius?
Located on the lateral side (thumb side) of the forearm.
Its distal portion is superficial and can be directly accessed.
Where is the Styloid Process of the Radius?
Located on the lateral side of the radius.
Wider, more substantial mound of bone.
Where is the Lister’s Tubercle?
Located on the dorsal surface of the radial styloid process.
Oblong shape, Lister’s tubercle (dorsal tubercle) acts as a hook for the extensor pollicis longus tendon.
Benchmark for finding two of the carpals (lunate/capitate)
NAMED IN HONOR OF JOSEPH LISTER (father of modern antiseptic surgery)
What are the 8 Carpal Bones?
Triquetrum, Lunate, Scaphoid, Pisiform, Hamate, Capitate, Trapezoid, and Trapezium.
Located at the wrist, distal to the flexor crease, under the heel of the hand.
Closely wedged together between the distal radius and ulna and the metacarpals.
Form two rows, each composed of four bones.
Where is the Pisiform?
Protruding along the ulnar/palmar surface of the wrist.
Just distal to the flexor crease.
Where is the Triquetrum?
Located on the dorsal surface of the pisiform, just distal to the styloid process of the the ulna.
Pyramid-shaped.
Where is the Hamate?
Located distal to the pisiform.
Has a small protuberance or “hook” that is palpable on the hand’s palmar surface.
Flat surface of the hamate’s body is accessible on hte hand’s dorsal surface where the bases of the fourth and fifth metacarpals merge.
Where is the Scaphoid (Navicular)?
Located on the radial side of the hand, distal to the styloid process of the radius.
Accessible from the dosral, palmar and radial sides of the wrist
Peanut shaped.
Where is the Trapezium?
Located distal to the scaphoid.
Articulates with the base of the first metacarpal.
Most accessible on its radial or dorsal side.
Can be isolated either distally from the scaphoid or proximally from the first metacarpal.
Where are the Scaphoid and Trapezium Tubercles?
Both tubercles are located on the palmar surface of the wrist, near the flexor crease.
Difficult to distinguish individually.
Where is the Lunate?
Located distal and medial to Lister’s Tubercle.
Relatively inaccessible when the wrist is in a neutral position.
Flexing the wrist will slide the lunate to the dorsal surface.
