Distal medial process of the humerus joins the ulna. Free Flashcards about Ch. 7 skeleton 2022-10-24

Free Flashcards about Ch. 7 skeleton

The proximal end of each metacarpal bone articulates with one of the distal carpal bones. The proximal portion of the humerus can be divided into three parts. Are the humerus bones inferior lateral and distal? Bones of the Wrist and Hand. Watch this video to learn about a Colles fracture, a break of the distal radius, usually caused by falling onto an outstretched hand. The roughened ridge of bone above the lateral epicondyle is the lateral supracondylar ridge. Metacarpal Bones The palm of the hand contains five elongated metacarpal bones.

Distal Humerus

The other bones that make up the lower part of the elbow joint are the ulna and the radius. Disorders of the Appendicular System: Fractures of the Upper Limb Bones Due to our constant use of the hands and the rest of our upper limbs, an injury to any of these areas will cause a significant loss of functional ability. Instead, the forearm deviates laterally by 5—15 degrees from the line of the arm. The hamate bone is characterized by a prominent bony extension on its anterior side called the hook of the hamate bone. The anterior movement of these bones, particularly the fifth metacarpal bone, increases the strength of contact for the medial hand during gripping actions.

Is the ulna proximal or distal to the humerus?

These injuries are especially common in elderly people whose bones are weakened due to osteoporosis. Deep pain at the lateral wrist may yield an initial diagnosis of a wrist sprain, but a radiograph taken several weeks after the injury, after tissue swelling has subsided, will reveal the fracture. It runs parallel to the radius, which is the lateral bone of the forearm Figure 2. Humerus and Elbow Joint The humerus is the single bone of the upper arm region. What is distal to the phalanges? Carpal Bones The wrist and base of the hand are formed by a series of eight small carpal bones see Figure 3.

Bones of the Upper Limb

At its proximal end is the head of the humerus. Each of these articulations is a carpometacarpal joint see Figure 4. The humerus is the bone of the upper arm. The prominent bony projection on the medial side is the medial epicondyle of the humerus. This is the large, round, smooth region that faces medially. Is the Trochlea proximal or distal? Which is smaller the proximal or the distal end of the ulna? A Colles fracture of the distal radius is the most common forearm fracture.

Determine the term being described or defined by the following statement: Distal medial process of the humerus; joins the ulna.

Explanation: Phalanges, the digits of the hand, are the most distal bones of the upper limb. Is the ulna anterior or posterior? During tight gripping—compare b to a —the fourth and, particularly, the fifth metatarsal bones are pulled anteriorly. It allows the forearm and hand to swing freely or to carry an object without hitting the hip. Specifically, it is located in our upper arm. The surgical neck is located at the base of the expanded, proximal end of the humerus, where it joins the narrow shaft of the humerus.

The distal medial process of the humerus to which the ulna joins is the a

This produces compression of the nerve, resulting in carpal tunnel syndrome, which is characterized by pain or numbness, and muscle weakness in those areas of the hand supplied by this nerve. The ulna acts as the stabilising bone, with the radius pivoting to produce movement. It is mostly unremarkable, terminating in a rounded head, with distal projection — the ulnar styloid process. The ulna also articulates with the radius in a syndesmosis joint via its interosseous membrane. This ridge forms the interosseous border of the radius, which, like the similar border of the ulna, is the line of attachment for the interosseous membrane that unites the two forearm bones. All of these areas are attachment points for muscles that act on the forearm, wrist, and hand. The humerus is the single bone of the upper arm, and the ulna medially and the radius laterally are the paired bones of the forearm.

Humerus Figure 3 — The distal end of the humerus has a unique set of bony features that articulate with the radius and ulna. The most commonly fractured carpal bone is the scaphoid, often resulting from a fall onto the hand. In this article, we shall look at the bony landmarks and osteology of the ulna. The surgical neck is a common site of arm fractures. The much smaller lateral epicondyle of the humerus is found on the lateral side of the distal humerus. A distal humerus fracture is a break in the lower end of the upper arm bone humerus , one of the three bones that come together to form the elbow joint. This area is the site of articulation between the proximal radius and the ulna, forming the proximal radioulnar joint.

The second and third metacarpal bones are firmly anchored in place and are immobile. . The flexor retinaculum is attached laterally to the trapezium and scaphoid bones, and medially to the hamate and pisiform bones. Many fractures result from a hard fall onto an outstretched hand. The small depression on the surface of the head articulates with the capitulum of the humerus as part of the elbow joint, whereas the smooth, outer margin of the head articulates with the radial notch of the ulna at the proximal radioulnar joint. Where does a distal humerus fracture occur in the arm? This provides attachment for ligaments that support the lateral side of the wrist joint. How does the ulna act as a stabilising bone? A strong ligament called the flexor retinaculum spans the top of this U-shaped area to maintain this grouping of the carpal bones.