The ulna is a long bone in the forearm. It lies medially and parallel to the radius, the second of the forearm bones. The ulna acts as the stablising bone, with the radius pivoting to produce movement. Proximally, the ulna articulates with the humerus at the elbow joint.
http://teachmeanatomy.info/upper-limb/bones/ulna/
It is wrench shaped, and articulates with the trochlea of the humerus. Radial Notch – Located on the lateral surface of the trochlear notch, this area articulates with the head of the radius. Tuberosity of Ulna – An roughening immediately distal of the coronoid process. It is where the brachialis muscle attaches.
http://teachmeanatomy.info/upper-limb/bones/ulna/
Arteries of arm. At the inferior border of the teres major, i.e., the distal limit of the posterior axillary fold, the axillary becomes the brachial artery (figs. 7-3 and 9-4). The brachial artery lies superficially on the medial side of the arm, at first medial to the humerus and then anterior to the bone.
http://www.dartmouth.edu/%7Ehumananatomy/part_2/chapter_9.html
Distal Portion of the Ulna. The distal end of the ulna is much smaller in diameter that the proximal end. It is mostly unremarkable, terminating in a rounded head, with distal projection – the ulnar styloid process. The head articulates with the ulnar notch of the radius to form the distal radio-ulnar joint.
http://teachmeanatomy.info/upper-limb/bones/ulna/
6-16, 9-5, and 9-6). The capitulum of the humerus articulates with the upper aspect of the head of the radius (humeroradial joint), and the trochlea of the humerus articulates with the trochlear notch of the ulna (humero-ulnar joint).
http://www.dartmouth.edu/%7Ehumananatomy/part_2/chapter_9.html
Proximal Portion of the Ulna. The proximal end of the ulna articulates with the trochlea of the humerus. To enable movement at the elbow joint, the ulna has a specialised structure, with bony prominences for muscle attachment.
http://teachmeanatomy.info/upper-limb/bones/ulna/
Muscles of arm (table 9-1). The muscles of the anterior arm are the biceps, coracobrachialis, and brachialis. They are supplied by the musculocutaneous nerve. The triceps is the muscle of the posterior arm, and it is supplied by the radial nerve.
http://www.dartmouth.edu/%7Ehumananatomy/part_2/chapter_9.html
Fig 1.0- Overview of the anatomical position of the humerus. The humerus is the bone that forms the upper arm, and joins it to the shoulder and forearm. The proximal region articulates with the scapula and clavicle, forming part of the shoulder joint. Distally, the humerus articulates with the forearm bones (radius and ulna), to form the elbow joint.
http://teachmeanatomy.info/upper-limb/bones/the-humerus/
Figure 9-1 Horizontal section through the middle of the arm. In A, the nerves and vessels are identified. B, shows the flexor muscles (supplied by the musculocutaneous nerve) anterior and the extensors (supplied by the radial nerve) posterior. B.B., biceps brachii; Br., brachialis.
http://www.dartmouth.edu/%7Ehumananatomy/part_2/chapter_9.html
Fig 1.3 – Anterior surface of the distal portion of the humerus. The trochlea articulates with the ulna, and the capitulum with the radius. The lateral and medial borders of the humerus form medial and lateral supraepicondylar ridges.
http://teachmeanatomy.info/upper-limb/bones/the-humerus/
which portion of the forearm directly articulates with the trochlea of the humerus
The ulna is a portion of the forearm that directly articulates with the trochlea of the humerus. The ulna is the portion of the forearm that directly articulates with the trochlea of the humerus. 