Finger Flexor Tendon Anatomy Model (Left Index)

myminifactory

About The Finger Flexor Tendon Anatomy Model (Left Index) is an educational creation by Janson to demonstrate the action of finger flexor tendons gliding through the A2 and A4 pulleys. Credit goes to Siderits "Human Hand Bones" for 3D models of finger bones, which Janson added pulleys and holes for articulation. Requires additional materials and assembly to complete. Printing Instructions Print with rafts and supports. I prefer printing bones vertically to avoid scarring from support material removal along the sides of the bones. Recommend three shells, 10% infill, two millimeter layer height for metacarpal & proximal phalanx and one or one and a half millimeter layer height for middle and distal phalanges (due to smaller size). Be sure to smooth all rough surfaces during post-processing. Assembly Instructions 1. Use one or one and a half millimeter elastic cord to articulate joints. Loop through holes in adjacent bones two to three times. Be careful not to over tighten elastic cords, as joints should move freely. Once proper tension is set, tuck free ends of elastic cords into bone holes and glue (cyanoacrylate) cord ends in place. 2. For the Flexor Digitorum Profundus (FDP) tendon, use a one and a half millimeter non-elastic cord. Tie a knot in one end and thread other end through the hole in the distal phalanx, A4 and A2 pulleys as well as the palmar aponeurosis (PA). 3. For the Flexor Digitorum Superficialis (FDS) tendon, use a point seven five millimeter nano paracord (non-elastic). Fold cord in half and thread ends through each holes in the middle phalanx. Bring the two cords together to make a "V" over the middle phalanx. Glue the remainder of the cord below the "V" together to make a single cord. Once glue is set, thread the FDS cord through the A2 pulley and palmar aponeurosis (PA). If you find a better method for creating a FDS tendon for this model, please message me. Once assembled, pull on the ends of the FDP and FDS cords to actively flex the finger joints.