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Bones of the Upper Limb: Ulna

Bones of the Upper Limb: Ulna

The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side of the...

Bones of the Upper Limb: Humerus

Bones of the Upper Limb: Humerus

The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...

Changes in the Appendicular Skeleton with Age

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...

Bones of the Upper Limb: Radius

Bones of the Upper Limb: Radius

The radius is longer of the two bones that make up the human antebrachium or forearm. At the proximal end, the radius articulates with the capitulum of the humerus and the radial notch of the ulna to form the elbow joint. At the distal end, the radius articulates with the ulna via the ulnar notch, forming the distal radioulnar joint. Distally, the radius also attaches to the carpal wrist bones (scaphoid and lunate) to form the radiocarpal joint.
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Classification of Bones

Classification of Bones

The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
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Bones of the Lower Limb: Tibia and Fibula

Bones of the Lower Limb: Tibia and Fibula

The tibia is the main weight-bearing bone of the lower leg. It is larger than the fibula with which it is paired. The tibia is also the second longest bone in the body and is located right below the skin. The proximal end of the tibia forms the medial and the lateral condyle, which articulates with the condyles of the femur to form the knee joint. Between the articulating surfaces is the irregular elevated area known as the intercondylar eminence that serves as the inferior attachment point for...

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Related Experiment Video

Updated: Jul 4, 2026

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Published on: December 3, 2016

The ulnius: a one-bone forearm in children.

Hamlet A Peterson¹

¹Mayo Clinic, Rochester, MN 55905, USA. peterson.hamlet@mayo.edu

Journal of Pediatric Orthopedics. Part B

|May 31, 2008

Summary

Surgical one-bone forearm reconstruction is effective for various pediatric conditions when the ulna and radius are available. Proper rotational alignment is crucial for optimal function following fusion.

Area of Science:

Orthopedic surgery
Pediatric orthopedics
Limb reconstruction

Background:

One-bone forearm (OBF) surgery is a reconstructive procedure for limb deformities.
It aims to create a functional single bone segment from the forearm.
Successful OBF requires adequate proximal ulna and distal radius bone stock.

Observation:

This report reviews existing pediatric literature on OBF.
Four pediatric cases with diverse underlying abnormalities are presented.
The rotational positioning of the fused forearm is a key consideration.

Findings:

OBF is indicated for multiple pediatric forearm conditions.
The technique's success is contingent on the availability of the proximal ulna and distal radius.

Related Experiment Videos

Last Updated: Jul 4, 2026

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Published on: December 3, 2016

Rotational alignment significantly impacts functional outcomes.

Implications:

OBF surgery offers a viable solution for specific pediatric forearm anomalies.
Careful preoperative planning regarding bone availability and rotational alignment is essential.
Further research into optimal rotational positioning may enhance functional results in pediatric OBF.