Question

Which parts of the humerus articulate with radius at the elbow and with ulna at the elbow?

Answer 1

The human brachium is defined by the humerus, which is the biggest bone in the upper extremity. It articulates with the glenoid proximally via the glenohumeral joint and with the radius and ulna distally via the elbow joint.

Complete answer:
The radial fossa is a small dip on the humerus above the capitulum's front half. When the forearm is flexed, it receives the anterior border of the radius head.
The capitulum of the humerus is a smooth, rounded prominence on the lateral section of the humerus' distal articular surface in human anatomy. It is restricted to the front and lower parts of the bone, and articulates with the cup shaped depression on the head of the radius.
The humeral trochlea is the medial region of the elbow joint's articular surface that articulates with the trochlear notch on the ulna in the forearm in the human arm.
The coronoid fossa is a tiny indentation above the front section of the trochlea that accepts the coronoid process of the ulna during forearm flexion. The radial fossa of the humerus is just next to it.
The olecranon fossa is a deep triangular depression superior to the trochlea on the posterior side of the humerus. During forearm extension, it provides space for the ulna's olecranon.
Radius articulates with the capitulum and radial fossa of the humerus.
The ulna articulates with the trochlea, coronoid fossa, and olecranon fossa of the humerus.

Note:
The humerus, ulna, and radius are the three bones that make up the elbow. The ends
of the bones have cartilage coverings. Cartilage is a rubbery substance that allows joints to glide over one another and absorb trauma. Ligaments that compose the joint capsule hold the bones together.