GROSS ANATOMY

GROSS ANATOMY

PECTORAL REGION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What two bones does the ulna articulate with?
A
Humerus & Scapula
B
Humerus & Radius
C
Radius & Carpals
D
Carpals & Metacarpals
Explanation: 

Detailed explanation-1: -The radius articulates proximally at the elbow with the capitulum of the humerus and the radial notch of the ulna. It articulates at its distal end with the ulna at the ulnar notch and with the articular surfaces of the scaphoid and lunate carpal bones.

Detailed explanation-2: -Proximally the ulna articulates with the humerus and the radius. Distally it contacts the carpus or wrist. The trochlear notch is the deep semicircular surface for articulation with the trochlea of the humerus. The olecranon is the squared process extending proximal to the trochlear notch.

Detailed explanation-3: -Ulnar (medial) collateral ligament – connects the ulna to the humerus on the inside of the elbow.

Detailed explanation-4: -The ulna does not directly articulate with any of the carpal bones. The distal carpal bones articulate with each other and along with the carpals that articulate with the radius contribute to the movement of the hand at the wrist. The distal carpal bones also articulate with the metacarpal bones of the hand.

Detailed explanation-5: -On the medial side of the distal radius is the ulnar notch of the radius. This shallow depression articulates with the head of the ulna, which together form the distal radioulnar joint.

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