अल्ना

अल्ना (एल्बो बोन) छगू लङ्ग बोन ख। थ्व प्रिज्म्याटिक आकारया जुइ व फोरआर्मया मेडियल सिथय् दै। थ्व क्वें रेडियसया प्यारालल दयाच्वनि। 

आर्टिकुलेसन
अल्नाया आर्टिकुलेसन थ्व कथं दु:
 ह्युमरस, प्रोक्जिमल्ली एल्बो जोर्नीइ हिञ्ज जोर्नीया स्वापूलि।
 रेडियस, एल्बोनापं पाइभोट जोर्नीया स्वापूलि, थुकिलिं याना रेडियसं अल्नायात प्रोनेसनय् क्रस ओभर याये छिनि। 
 डिस्टल रेडियस नाप अल्नर नोचय् स्वापू।
 रेडियस नाप रेडियस व अल्नाया हाकलिं हे इन्टरओस्सियस मेम्ब्रेनं सिन्डिस्मोसिस जोर्नीया कथं स्वापू दयाच्वनि।

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 ulnar tuberosity to which muscles can attach.

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

  Structure 
The long, narrow medullary cavity is enclosed in a strong wall of compact tissue which is thickest along the interosseous border and dorsal surface. 

At the extremities the compact layer thins. 

The compact layer is continued onto the back of the olecranon as a plate of close spongy bone with lamellæ parallel. 

From the inner surface of this plate and the compact layer below it trabeculæ arch forward toward the olecranon and coronoid and cross other trabeculæ, passing backward over the medullary cavity from the upper part of the shaft below the coronoid. 

Below the coronoid process there is a small area of compact bone from which trabeculæ curve upward to end obliquely to the surface of the semilunar notch which is coated with a thin layer of compact bone. 

The trabeculæ at the lower end have a more longitudinal direction.

Muscle attachments

 Muscle  Direction  Attachment    Triceps brachii muscle     Insertion    Olecranon process (via common tendon)
   Anconeus muscle     Insertion    Olecranon process (lateral aspect)
   Brachialis muscle     Insertion    Coronoid process of the ulna
   Pronator teres muscle     Origin    Coronoid process (also shares origin with medial epicondyle of the humerus)
   Flexor carpi ulnaris muscle     Origin    Olecranon process and posterior surface of ulna (also shares origin with medial epicondyle of the humerus)
   Flexor digitorum superficialis muscle     Origin    Coronoid process (also shares origin with medial epicondyle of the humerus and shaft of the radius)
   Flexor digitorum profundus muscle     Origin    Coronoid process, anteromedial surface of ulna (also shares origin with the interosseous membrane)
   Pronator quadratus muscle     Origin    Distal portion of anterior ulnar shaft
   Extensor carpi ulnaris muscle     Origin    Posterior border of ulna (also shares origin with lateral epicondyle of the humerus)   
   Supinator muscle     Origin    Proximal ulna (also shares origin with lateral epicondyle of the humerus)   
   Abductor pollicis longus muscle     Origin    Posterior surface of ulna (also shares origin with the posterior surface of the radius bone)   
   Extensor pollicis longus muscle     Origin    Dorsal shaft of ulna (also shares origin with the dorsal shaft of the radius and the interosseous membrane)   
   Extensor pollicis brevis muscle     Origin    Dorsal shaft of ulna (also shares origin with the dorsal shaft of the radius and the interosseous membrane)   
   Extensor indicis muscle     Origin    Posterior surface of distal ulna (also shares origin with the interosseous membrane)   

स्वयादिसँ
क्वें
Bone terminology
Terms for anatomical location
Ossification of ulna

Additional images

 External links 
 Ulnar fractures

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पुचः:लङ्ग बोन
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