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Ulna - Proximal and distal aspects

Ulna - Proximal and distal aspects: Encyclopedia II - Ulna - Proximal and distal aspects

The ulna is broader proximally, and narrower distally. Proximally, the ulna has a bony process, the olecranon process, a hook-like structure that fits into the olecranon fossa of the humerus. This prevents hyperextension and forms a hinge joint with the trochlea of the humerus. There is also a radial notch for the head of the radius, and the ulna tuberosity to which muscles can attach. Distally (near the hand), there is a styloid process. See also:

Ulna, Ulna - Articulations, Ulna - Proximal and distal aspects, Ulna - The upper extremity, Ulna - The olecranon, Ulna - The coronoid process, Ulna - The semilunar notch, Ulna - The radial notch, Ulna - The body or shaft, Ulna - Borders, Ulna - Surfaces, Ulna - The lower extremity, Ulna - Structure, Ulna - Ossification

Ulna, Ulna - Articulations, Ulna - Borders, Ulna - Ossification, Ulna - Proximal and distal aspects, Ulna - Structure, Ulna - Surfaces, Ulna - The body or shaft, Ulna - The coronoid process, Ulna - The lower extremity, Ulna - The olecranon, Ulna - The radial notch, Ulna - The semilunar notch, Ulna - The upper extremity, Bone terminology, Terms for anatomical location

Ulna: Encyclopedia II - Ulna - Proximal and distal aspects

Ulna - Proximal and distal aspects

The ulna is broader proximally, and narrower distally.

Proximally, the ulna has a bony process, the olecranon process, a hook-like structure that fits into the olecranon fossa of the humerus. This prevents hyperextension and forms a hinge joint with the trochlea of the humerus. There is also a radial notch for the head of the radius, and the ulna tuberosity to which muscles can attach.

Distally (near the hand), there is a styloid process.

Overview of body and two extremities

It is divisible into a body and two extremities. Its upper extremity, of great thickness and strength, forms a large part of the elbow-joint; the bone diminishes in size from above downward, its lower extremity being very small, and excluded from the wrist-joint by the interposition of an articular disk.

Other related archives

Bone terminology, Gray's Anatomy, SHOULDER, SKULL, Skeletal system, THORAX, Terms for anatomical location, Upper limb anatomy, abductor pollicis longus, arm, atlas, axis, brachialis, calcaneus, capitate, carpus, cervical, clavicle, coccyx, cuboid, cuneiform, distal, elbow, epiphysis, ethmoid, extensor carpi ulnaris, femur, fibula, flexor carpi ulnaris, flexor digitorum profundus, forearm, frontal, hamate, humerus, hyoid, incus, inferior nasal conchae, intermediate, joint, lacrimal, leg, lumbar, lunate bone, malleus, mandible, maxilla, metacarpals, metatarsals, nasal, navicular, occipital, ossa coxae, ossicles, palatine, parietal, patella, pisiform, prismatic, process, pronator quadratus, pronator teres, proximal, public domain, radius, rib, sacrum, scaphoid, scapula, sphenoid, stapes, sternum, supinator, talus, tarsus, temporal, thoracic, tibia, trapezium, trapezoid, triceps brachii, triquetral, vertebrae, vomer, zygomatic

Adapted from the Wikipedia article "Proximal and distal aspects", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki

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