GROSS ANATOMY

Detailed explanation-1: -There are five annular pulleys within each finger that are referred to as the A1, A2, A3, A4, and A5 (Fig. 3). The A2 and A4 are considered to be the most struc-turally important in maintaining the integrity of the flexor tendon system due to their direct attachment to the underly-ing bone.

Detailed explanation-2: -There are five pulleys in the fingers, called annular pulleys and they are named A1 through A5 (Figure 1). The A1, A3, and A5 pulleys are smaller and considered minor pulleys (mostly due to size and not importance). The A2 and A4 pulleys are larger and are sometimes called the major pulleys.

Detailed explanation-3: -Flexor pulley system consists of the following: Palmar Aponeurosis Pulley. 5 Annular Pulleys.

Detailed explanation-4: -In the thumb there are two annular pulleys and a single oblique pulley. Together, the A pulleys form a continuous tunnel and, because each A pulley’s attachments on the bone is wider than its roof, its shape prevents the pulley from pinching its neighbours at extremes of flexion.

Detailed explanation-5: -Abstract. The first annular (A1) pulley is an important structure of the hand, providing a biomechanical support to the metacarpophalangeal joint and maintaining joint stability and flexor tendon alignment.