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Extensor carpi ulnar: originates on the lateral epicondyle of the humerus and inserts on the metacarpal 5 and the accessory carpal bone. It acts to abduct and extend the carpal joint. It is innervated by the radial nerve. Supinator: originates on the lateral epicondyle of the humerus and inserts on the radius. It acts to rotate the forearm ...
English: Skeleton of a dog: A – Cervical or Neck Bones (7 in number). B – Dorsal or Thoracic Bones (13 in number, each bearing a rib). C – Lumbar Bones (7 in number).D – Sacral Bones (3 in number). E – Caudal or Tail Bones (20 to 23 in number). 1 – Cranium, or Skull. 2 – Maxilla. 3 – Mandible, or Lower jaw . 4 – Atlas. 5 – Axis.
In human anatomy, the main role of the carpal bones is to articulate with the radial and ulnar heads to form a highly mobile condyloid joint (i.e. wrist joint), [1] to provide attachments for thenar and hypothenar muscles, and to form part of the rigid carpal tunnel which allows the median nerve and tendons of the anterior forearm muscles to be ...
The triquetral bone (/ t r aɪ ˈ k w ɛ t r əl,-ˈ k w iː-/; also called triquetrum, pyramidal, three-faced, and formerly cuneiform bone) is located in the wrist on the medial side of the proximal row of the carpus between the lunate and pisiform bones. It is on the ulnar side of the hand, but does not directly articulate with the ulna.
The carpus and tarsus of land vertebrates primitively had three rows of carpal or tarsal bones. Often, some of these have become lost or fused in evolution. Accessory bones amidst tarsals. Three proximal bones. Humans hold all three in their hands.
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It is the last carpal bone to ossify. The pisiform bone is a small bone found in the proximal row of the wrist . It is situated where the ulna joins the wrist, within the tendon of the flexor carpi ulnaris muscle. [1]: 199, 205 It only has one side that acts as a joint, articulating with the triquetral bone. It is on a plane anterior to the ...
The carpal bones function as a unit to provide a bony superstructure for the hand. [5]: 708 The scaphoid is also involved in movement of the wrist. [1]: 6 It, along with the lunate bone, articulates with the radius and ulna to form the major bones involved in movement of the wrist. [5]