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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 stabilising bone, with the radius pivoting to produce movement. Proximally, the ulna articulates with the humerus at the elbow joint. Distally, the ulna articulates with the radius, forming the distal radio ...
The distal end is sometimes referred to as the head of your ulna. Your healthcare provider may use all these parts and labels as they describe where you’re having pain or issues. If you ever break your ulna (an ulnar fracture), your provider might use some of these terms to describe where your bone was damaged.
2. Shaft. The shaft or body is the long middle part of the ulna bone. Moving down toward the distal side, the shaft tapers gradually [8] and has three prominent surfaces and three borders ― the anterior, posterior, interosseous borders and the anterior, posterior, medial surfaces [3].
The radius and ulna are long bones that make up the forearm, extending from the elbow to the wrist. In the anatomical position, the radius is found in the lateral forearm, while the ulna is found in the medial forearm. The radius is shorter than the ulna and has a small proximal end that articulates with the humerus, and a broad distal end that ...
A distal ulna fracture, or isolated ulnar shaft fracture, is a type of fracture that occurs along the length of the ulna bone, which is one of the two bones in the forearm. A distal ulna fracture may occur at different sections of the ulna bone, such as near the wrist at the farthest (distal) end of the bone, the middle of the ulna bone, or ...
The main function of the ulna, along with the radius, is to assist with rotation. This rotation allows for the maximal function of the wrist and hand due to the increased range of motion. The sole motion of the elbow joint is flexion and extension, otherwise known as bending and straightening the arm. Due to this limitation, the forearm allows ...
The ulna is one of the two forearm long bones that, in conjunction with the radius, make up the antebrachium. The bone spans from the elbow to the wrist on the medial side of the forearm when in anatomical position. In comparison to the radius, the ulna is described to be larger and longer. It serves as the origin and/or insertion site for more than a dozen muscles and is involved in motions ...
Anatomy Explorer. The ulna is the longer, larger and more medial of the lower arm bones. Many muscles in the arm and forearm attach to the ulna to perform movements of the arm, hand and wrist. Movement of the ulna is essential to such everyday functions as throwing a ball and driving a car. The ulna extends through the forearm from the elbow to ...
The distal epiphysis (distal end or extremity) of the ulna is the part of the bone that is the closest to the wrist. When compared to the proximal end, the distal extremity is smaller in diameter. The distal end of the ulna terminates in two protrusions - a rounded head and a smaller projection known as the styloid process.
Surfaces of ulnar shaft (lateral view) by Anatomy.app . Distal end of ulna. The distal end or epiphysis of the ulna is a part of the ulna located closer to the wrist. It is smaller in diameter than the proximal end. The distal end of the ulna terminates with a rounded head and a distal projection known as the ulnar styloid process.
1/3. Synonyms: none. The elbow joint is a synovial joint that connects the arm and the forearm, providing 150 ْ of extension-flexion movement. It consists of three joints; the humeroulnar joint, the humeroradial joint, and the proximal radioulnar joint, all within one articular capsule!
The ulna is one of two bones that make up the forearm, the other being the radius. It forms the elbow joint with the humerus and also articulates with the radius both proximally and distally. It is located in the medial forearm when the arm is in the anatomical position. It is the larger of the two forearm bones. [1]
The ulna is a long bone in the forearm that runs parallel to the radius, forming the medial (inner) border of the forearm. It is one of the two bones in the forearm, along with the radius, and plays a critical role in the movement and stability of the elbow, wrist and hand. In this article, we will explore the anatomy of the ulna, including its ...
The ulna (plural: ulnae) is one of the two long bones of the forearm, located medially in the supinated anatomic position. It has a larger proximal end and tapers to a smaller distal end (opposite to the radius). Gross anatomy Osteology Promin...
Bony anatomy. 4. Principle of columns. The distal forearm may be thought of in terms of three columns. The ulna forms one column. The radius may be thought of as an intermediate and a radial column. Distally at the wrist joint, the radial column articulates with the scaphoid and the intermediate column articulates with the lunate.
Head: articulates with the radius at the distal radio-ulnar joint via the ulnar notch. The head is covered by the triangular articular disc which forms part of the triangular fibrocartilage complex. Styloid process: extends distally, provides attachment for the ulnar collateral ligament. The ulna is a long bone located medially in the forearm.
The upper limb is divided into three regions. These consist of the arm, located between the shoulder and elbow joints; the forearm, which is between the elbow and wrist joints; and the hand, which is located distal to the wrist. There are 30 bones in each upper limb. The humerus is the single bone of the arm, and the ulna (medially) and the ...
Distal Ulna. The distal ulna is the articular extension of the ulnar shaft into the carpus and the DRUJ. It is composed of the ulnar head (faces the undersurface of the triangular fibrocartilage complex [TFCC]), seat (articulates with the sigmoid notch), styloid, and fovea. The arc of curvature of the ulnar seat is 111 degrees.
The radius pivots around the ulna to produce movement at the proximal and distal radio-ulnar joints. The radius articulates in four places: Elbow joint – Partly formed by an articulation between the head of the radius, and the capitulum of the humerus. Proximal radioulnar joint – An articulation between the radial head, and the radial notch ...
The term “wrist” is used to describe the joint where the hand is connected to the forearm. The actual anatomy of the wrist is not as simple. There are eight smaller bones that connect the five main hand bones (metacarpals) to the two forearm bones (radius and ulna) (Figure 1). Ulnar wrist pain (pain on the pinkie side of the wrist) is very ...