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Radius and Ulna Bones Anatomy – Posterior Markings

Radius Bone Markings:

  1. image descriptionRadial Head (caput radii) is a proximal, disc-shaped prominence. Its concave superior surface articulates with the capitulum of the humerus and its cylindrical lateral surface articulates with the radial notch of the ulna.
Radius and Ulna Bones - Posterior View
Radial head - Radius and Ulna Bones - Posterior View
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  1. image descriptionRadial Neck (collum radii) is the region of bone between the head and tuberosity.
Radius and Ulna Bones - Posterior View
Radial neck - Radius and Ulna Bones - Posterior View
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  1. image descriptionRadial Shaft or body (corpus radii) is the elongated region of bone that extends distal to the neck.
Radius and Ulna Bones - Posterior View
Radial shaft - Radius and Ulna Bones - Posterior View
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  1. image descriptionInterosseous border of the radius (margo interosseus radii) is the medial edge (margin) of the bone where the interosseous membrane attaches.  This thin connective tissue membrane divides the forearm into anterior and posterior compartments. It also is an attachment site for several forearm muscles and transfers tension from the radius to the ulna.
Radius and Ulna Bones - Posterior View
Interosseous border of radius - Radius and Ulna Bones - Posterior View
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  1. image descriptionStyloid process of the radius (processus styloideus radii) is a thick, pointed, lateral projection from the distal end of bone. It forms the lateral portion of the wrist joint and serves as an attachment site for the brachioradialis muscle and radial (lateral) collateral ligament
Radius and Ulna Bones - Posterior View
Styloid process of radius - Radius and Ulna Bones - Posterior View
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  1. image descriptionUlnar notch (incisura ulnaris) is a mediodistal concavity that allows the radius to pivot around the head of the ulna during pronation and supination of the forearm, wrist, and hand.
Ulnar notch - Radius and Ulna Bones - Posterior View
Ulnar notch - Radius and Ulna Bones - Posterior View - Labeled
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Ulna Bone Markings:

  1. image descriptionOlecranon or olecranon process (olecranon ulnae) is a large, fan-shaped superior projection from the proximal end of the ulna. Its curved anterior surface forms the superior portion of the trochlear notch, and its rounded posterior surface forms the bump of the elbow. It also is an attachment site for the triceps brachii, anconeus, and flexor carpi ulnaris muslces.
Radius and Ulna Bones - Posterior View
Olecranon - Radius and Ulna Bones - Posterior View
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  1. image descriptionUlnar shaft (corpus ulnae) is the body of the bone that extends distal to the olecranon.
Radius and Ulna Bones - Posterior View
Ulnar shaft - Radius and Ulna Bones - Posterior View
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  1. image descriptionInterosseous border of the ulna (margo interosseus ulnae) is the portion of the lateral margin of the bone where the interosseous membrane attaches.
Radius and Ulna Bones - Posterior View
Interosseous border of ulna - Radius and Ulna Bones - Posterior View
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  1. image descriptionUlnar head (caput ulnae) is a small rounded eminence at the distal end of the ulna. Its inferior surface articulates with the articular disc cartilage of the wrist, and its lateral surface articulates with the ulnar notch of the radius during pronation and supination of forearm, wrist, and hand.
Radius and Ulna Bones - Posterior View
Ulnar head - Radius and Ulna Bones - Posterior View
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  1. image descriptionStyloid process of the ulna (processeus styloideus ulnae) is a small projection that descends from the posterior portion of the ulnar head. It is an attachment point for the ulnar collateral ligament, which connects the ulna to the triquetral and pisiform carpal bones at the wrist.
Radius and Ulna Bones - Posterior View
Styloid process of ulna - Radius and Ulna Bones - Posterior View
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Test yourself:

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Part[2]: [image descriptionShow/image descriptionHide]

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