00:00 / 00:00
Anatomy of the arm
Anatomy of the axilla
Anatomy of the brachial plexus
Anatomy of the elbow joint
Anatomy of the glenohumeral joint
Anatomy of the pectoral and scapular regions
Anatomy of the radioulnar joints
Anatomy of the sternoclavicular and acromioclavicular joints
Bones of the upper limb
Fascia, vessels and nerves of the upper limb
Joints of the wrist and hand
Muscles of the forearm
Muscles of the hand
Vessels and nerves of the forearm
Vessels and nerves of the hand
Anatomy clinical correlates: Arm, elbow and forearm
Anatomy clinical correlates: Axilla
Anatomy clinical correlates: Clavicle and shoulder
Anatomy clinical correlates: Median, ulnar and radial nerves
Anatomy clinical correlates: Wrist and hand
The radioulnar joints are two joints between the two bones of the forearm: the ulna, on the medial side, and the radius, on the lateral side.
There’s one superior, or proximal radioulnar joint, and one inferior, or distal radioulnar joint, and together they allow for the movements of pronation and supination.
This is gonna be short and sweet, so let’s dive right in!
The proximal radioulnar joint is a pivot type of synovial joint, which consists of the head of the radius articulating with the radial notch of the ulna.
The radial head is tightly bound into the radial notch of the ulna by the anular ligament that secures it in place.
The two articulating surfaces are covered by a synovial membrane, over which lies the joint capsule.
The joint capsule of the proximal radioulnar joint is an extension of the elbow’s joint capsule.
Next up, in the distal forearm, the radius and the ulna form another pivot type of synovial joint called the distal radioulnar joint, which is also covered by a fibrous joint capsule lined internally with a synovial membrane.
For this joint, the rounded head of the ulna articulates with the ulnar notch of the distal radius.
The articulating surfaces are mainly bound together by a fibrocartilaginous structure called the articular disc, which is triangular in shape, so it’s also known as the triangular ligament.
The articular disc attaches to the edge of the ulnar notch of the radius, and the base of the styloid process of the ulna.
Latest on COVID-19
Nurse Practitioner (NP)
Physician Assistant (PA)
Create custom content
Raise the Line Podcast
Copyright © 2024 Elsevier, its licensors, and contributors. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Cookies are used by this site.
Terms and Conditions
USMLE® is a joint program of the Federation of State Medical Boards (FSMB) and the National Board of Medical Examiners (NBME). COMLEX-USA® is a registered trademark of The National Board of Osteopathic Medical Examiners, Inc. NCLEX-RN® is a registered trademark of the National Council of State Boards of Nursing, Inc. Test names and other trademarks are the property of the respective trademark holders. None of the trademark holders are endorsed by nor affiliated with Osmosis or this website.