Which muscle is responsible for the abduction of the index finger?

The 1st dorsal interossei muscle is specifically responsible for the abduction of the index finger. This muscle is located in the hand and is part of the group of interossei muscles, which are divided into dorsal and palmar muscles. The dorsal interossei muscles facilitate the movement of the fingers away from the midline of the hand, and in the case of the index finger, the 1st dorsal interossei is critical for its abduction.

The role of the 1st dorsal interossei is particularly important in fine motor tasks and gripping actions, making it essential for activities that require dexterity. Understanding this muscle's function helps to clarify how finger movements are coordinated through the intrinsic muscles of the hand, highlighting its significance in hand anatomy and function. This foundational knowledge supports the understanding of hand mechanics necessary for assessing functionality in clinical settings.