Skeletal Anatomy: Humerus, Ulna, Radius Flashcards
(30 cards)
What does the round head at the proximal end of the humerus articulate with?
Glenoid cavity of the scapula
What does the anatomical neck mark?
Extent of joint capsule
What does the surgical neck mark?
It corresponds to the metaphysics of the growing bone
What is the deltoid tuberosity?
Large, rough elevation on the lateral surface of the shaft, approximately halfway along its length. The deltoid muscle attaches to it.
What is the lesser tubercle?
Smaller projection that lies on the anterior, medial surface of the epiphysis
What is the greater tubercle?
Rounded projection on the lateral surface of the epiphysis, near the margin of the humeral head. Establishes lateral contour of shoulder.
What is the intertubercular grove?
Lies between the greater and lesser. Both tubercles are important sites for muscle attachment. A large tendon runs along the groove.
What is the radial groove?
Crosses inferior end of deltoid tuberosity
Depression marks path of radial nerve, a large nerve that provides both sensory information from the posterior surface of the limb and motor control over muscles that straighten the elbow.
What does the humerus articulate with at the condyle?
Radius and ulna
What forms the lateral surface of the condyle?
Rounded capitulum
What are the two epicondyles?
Lateral and medial epicondyles
What is the trochlea?
- Spool-shaped medial portion of the condyle
- Extends from olecranon fossa on the posterior surface to the coronoid fossa on the anterior surface
- These depressions accept projections from the ulna as the elbow approaches the limits of its range of motion
What are the bones of the forearm and arm?
Arm: Humerus
Forearm: Radius and Ulna
What is the anatomical position of the ulnar?
The ulnar lies medial to the radius
What is the olecranon?
The olecranon is the superior end of the ulna. It is the point of the elbow.
What is the interosseous membrane?
Fibrous sheet that connects shafts of ulna and radius
What does the ulna notch of the radius mark?
The site of articulation with the head of the ulna
What is the description of the ulnar head?
Slender and rounded
What is the name of the process that is attached to the posterior, lateral surface of the ulnar head?
Styloid process
What is the function of the styloid process?
Site of attachment of a cartilage disc. Cartilage separates ulnar head from bones of the wrist.
What is the name of the process that is at the distal end of the radius?
Styloid process
What is the function of the styloid process of the radius?
Helps stabilize the wrist joint
What does the distal end of the radius articulate with at the styloid process?
Bones of the wrist
What is the joint between the distal end of the radius and the lateral surface of the ulnar head called?
Distal radio-ulnar joint
