The shape of the joint between the capitulum and radius allows the forearm and hand to rotate and bend at the elbow while the ulna forms a tight hinge with the trochlea.
On the posterior side of the humerus, a small cavity known as the olecranon fossa allows the tip of the ulna, known as the olecranon, to lock into the humerus and prevent the extension of the elbow beyond degrees.
The humerus is classified structurally as a long bone because it is considerably longer than it is wide. Like all long bones, the humerus is hollow in the middle of its shaft and is reinforced at the ends by small columns of spongy bone known as trabeculae. Red bone marrow, the tissue that produces new blood cells, is found in the ends of the humerus and supported by the trabeculae.
The hollow medullary cavity in the middle of the shaft of the humerus is filled with fatty yellow bone marrow for energy storage. Compact bone forms the largest and strongest structure in the humerus, surrounding the trabeculae in the ends and the medullary cavity in the shaft.
At any time, you can update your settings through the "EU Privacy" link at the bottom of any page. These choices will be signaled globally to our partners and will not affect browsing data. We and our partners process data to: Actively scan device characteristics for identification. I Accept Show Purposes. Table of Contents View All.
Table of Contents. Associated Conditions. Was this page helpful? Thanks for your feedback! Sign Up. What are your concerns? Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles.
Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Related Articles. The Anatomy of the Ulna. The Anatomy of the Radius. Arm Muscle Anatomy and Function. Understanding the Function of Human Joints. Anatomy and Common Injuries of the Feet or Ankles.
Collarbone Popping? Scapula: Anatomy, Function, and Treatment. The Anatomy of the Deltoid Muscle. A humerus fracture is a break in the large bone of your upper arm. There are several types of humerus fractures, depending on the location of the….
But pain in one part of the body can sometimes originate elsewhere. A pain in your left arm could…. When something goes wrong with your shoulder, it hampers your ability to move freely and can cause a great deal of pain and discomfort.
In many cases…. Shoulder mobility stretches and exercises can help improve shoulder flexibility, reduce tension, increase range of motion, and prevent injury.
Bone pain is an extreme tenderness or aching in one or more bones. A recessed maxilla can cause cosmetic issues like flat cheekbones and a prominent jaw, and lead to dental problems, speech issues, and obstructed….
If you do tear a meniscus, you might be tempted to "walk it off. A lateral pelvic tilt is when one hip is higher than the other. Learn about five exercises that can help with this condition. Health Conditions Discover Plan Connect. Type 2 Diabetes. Different types of bones have differing shapes related to their particular function. There are flat bones in the skull occipital, parietal, frontal, nasal, lacrimal, and vomer , the thoracic cage sternum and ribs , and the pelvis ilium, ischium, and pubis.
The function of flat bones is to protect internal organs such as the brain, heart, and pelvic organs. Flat bones are somewhat flattened, and can provide protection, like a shield; flat bones can also provide large areas of attachment for muscles. The long bones , longer than they are wide, include the femur the longest bone in the body as well as relatively small bones in the fingers. Long bones function to support the weight of the body and facilitate movement. Long bones are mostly located in the appendicular skeleton and include bones in the lower limbs the tibia, fibula, femur, metatarsals, and phalanges and bones in the upper limbs the humerus, radius, ulna, metacarpals, and phalanges.
Short bones are about as long as they are wide. Located in the wrist and ankle joints, short bones provide stability and some movement. The carpals in the wrist scaphoid, lunate, triquetral, hamate, pisiform, capitate, trapezoid, and trapezium and the tarsals in the ankles calcaneus, talus, navicular, cuboid, lateral cuneiform, intermediate cuneiform, and medial cuneiform are examples of short bones.
Irregular bones vary in shape and structure and therefore do not fit into any other category flat, short, long, or sesamoid.
0コメント