Wrist

Pisiform Bone

Pisiform Bone The structure indicated is the pisiform bone of the hand. There are three groups of bones in the hand: Carpal bones (8 in total) Metacarpal bones Phalanges The carpal bones are separated into two rows: Proximal row Distal row The pisiform bone is one of four bones in the proximal row of carpals (scaphoid, lunate, triquetral, pisiform). The pisiform bone is a tiny sesamoid bone located in the tendon of the flexor carpi ulnaris muscle. It articulates with the palmar surface of the triquetral bone. Learn more about the anatomy of the bones of the hand in this …

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Pisiform bone

Triquetral Bone

Triquetral Bone The structure indicated is the triquetral bone of the hand. There are three groups of bones in the hand: Carpal bones (8 in total) Metacarpal bones Phalanges The carpal bones are separated into two rows: Proximal row Distal row The triquetral bone is one of four bones in the proximal row of carpals (scaphoid, lunate, triquetral, pisiform). The triquetral bone is located medially in the hand and articulates with the pisiform bone, the hamate and lunate bones. On the medial aspect of the volar surface of the triquetral bone is a facet for articulation with the small pisiform …

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triquetral bone

Trapezoid Bone

Trapezoid Bone The structure indicated is the trapezoid bone of the hand. There are three groups of bones in the hand: Carpal bones (8 in total) Metacarpal bones Phalanges The carpal bones are separated into two rows: Proximal row Distal row The trapezoid bone is located in the distal row of carpal bones. There are four bones in the distal row: Trapezium Trapezoid Capitate Hamate It’s easy to confuse the location of the trapezoid with the adjacent and similarly named trapezium bone. A way to remember where the trapezium is located is that trapezi-UM rhymes with thUMB, and therefore articulates …

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trapezoid bone

Scaphoid Bone

Scaphoid Bone The structure indicated is the scaphoid bone. There are three groups of bones in the hand: Carpal bones (8 in total) Metacarpal bones Phalanges The carpal bones are separated into two rows: Proximal row Distal row The scaphoid bone is one of four bones in the proximal row of carpals (scaphoid, lunate, triquetrum, pisiform). The lunate bone is located centrally in the wrist between the scaphoid and triquetral bones. It gets its name from its crescent shape (lunar = relating to the moon). It has the following articulations: Proximal: Radius Distal: trapezoid and trapezium Medial: capitate and lunate …

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Scaphoid Bone

Lunate Bone

Lunate The structure indicated is the lunate bone of the hand. There are three groups of bones in the hand: Carpal bones (8 in total) Metacarpal bones Phalanges The carpal bones are separated into two rows: Proximal row Distal row The lunate bone is one of four bones in the proximal row of carpals (scaphoid, lunate, triquetrum, pisiform). The lunate bone is located centrally in the wrist between the scaphoid and triquetral bones. It gets its name from its crescent shape (lunar = relating to the moon). It has the following articulations: Proximal: Radius Distal: capitate and hamate Lateral: scaphoid …

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Lunate bone

Trapezium Bone

Trapezium Bone The structure indicated is the trapezium bone of the hand. There are three groups of bones in the hand: Carpal bones (8 in total) Metacarpal bones Phalanges The carpal bones are separated into two rows: Proximal row Distal row The trapezium bone is located in the distal row of carpal bones. There are four bones in the distal row: Trapezium Trapezoid Capitate Hamate The trapezium bone articulates with the 1st metacarpal of the thumb. It’s easy to confuse the location of the trapezium with the adjacent and similarly named trapezoid bone. A way to remember where the trapezium …

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Trapezium

Styloid Process of Ulna

Styloid Process of Ulna The structure indicated is the styloid process of the ulna. The styloid process of the ulna is a bony process that extends from the distal end of the ulna bone. Attaching to the styloid process of the ulna is the ulnar collateral ligament of the wrist. Learn more about the anatomy of the radius and ulna in this tutorial

Styloid process of ulna

Hamate Bone

Hamate Bone The structure indicated is the hamate bone of the hand. There are three groups of bones in the hand: Carpal bones (8 in total) Metacarpal bones Phalanges The carpal bones are separated into two rows: Proximal row Distal row The hamate bone is one of four bones in the distal row of carpals (hamate, capitate, trapezium, trapezoid). It is named after its small hook-like process (“hamulus” comes from the Latin meaning hook). Several structures attach to the hook of the hamate bone. The hamate bone has the following articulations: Radial: capitate Ulnar: pisiform Proximal: lunate Distal: metacarpals of …

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hand - hamate

Carpal Tunnel

Carpal Tunnel Represented in this diagram is the carpal tunnel. The carpal tunnel is formed by an arch of carpal bones and the flexor retinaculum, found on the anterior aspect of the wrist. The flexor retinaculum attaches on the radial side to the scaphoid tubercle and the trapezium bone; on the ulnar side it attaches to the hook of the hamate and the pisiform. Its attachment over the arch of carpal bones converts the space into a tunnel which allows for the passage of several tendons and the median nerve. The carpal tunnel contains nine long flexor tendons and the …

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Carpal Tunnel

Capitate Bone

Capitate Bone The structure highlighted is the capitate bone of the hand. There are three groups of bones in the hand: Carpal bones (8 in total) Metacarpal bones Phalanges The carpal bones are separated into two rows: Proximal row Distal row The capitate bone is located in the distal row of carpal bones. It is the largest of the carpal bones and is located centrally in the wrist. The capitate bone has a “head” which articulates with the scaphoid and lunate bones of the proximal row. Laterally, on the radial side is the trapezoid bone, on medially, on the ulnar side …

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Capitate Bone