How are the proximal row of carpals arranged from lateral to medial?

The correct arrangement of the proximal row of carpals from lateral to medial is indeed Scaphoid, Lunate, Triquetrum, and Pisiform. This order is critical for understanding both the anatomy and function of the wrist.

The scaphoid is the most lateral carpal bone in the proximal row and is shaped like a boat. It articulates with the radius, making it a common site for fractures. Next, the lunate is positioned medially to the scaphoid and is known for its crescent shape, functioning as a key connection between the forearm and the hand. Following the lunate, the triquetrum is found, which is a wedge-shaped bone that also participates in wrist movements and stability. Finally, the pisiform sits on top of the triquetrum, making it the most medial bone in the proximal row. It is notable for being a sesamoid bone that serves as a tendon attachment for the flexor carpi ulnaris.

Knowing this arrangement is essential for clinical practices such as interpreting radiographs and performing wrist assessments, as it directly impacts how injuries and conditions of the wrist are approached in orthopedics.