Within each osseo-aponeurotic canal the tendons of the Flexor digitorum superficialis (Flexores digitorum sublimis although accurate is no longer a common description) and profundus are connected to each other, and to the phalanges, by slender, tendinous bands, called vincula tendina. There are two sets of these:

• (a) the vincula brevia, which are two in number in each finger, and consist of triangular bands of fibers, one connecting the tendon of the Flexor digitorum superficialis to the front of the first interphalangeal joint
  Interphalangeal joint
  Interphalangeal joint may refer to:*Interphalangeal articulations of hand*Interphalangeal articulations of foot...
  
   and head of the first phalanx
  Phalanx bones
  In anatomy, phalanx bones are those that form the fingers and toes. In primates such as humans and monkeys, the thumb and big toe have two phalanges, while the other fingers and toes consist of three. Phalanges are classified as long bones.The phalanges do not have individual names...
  
  , and the other the tendon of the Flexor digitorum profundus to the front of the second interphalangeal joint and head of the second phalanx;

• (b) the vincula longa, which connect the under surfaces of the tendons of the Flexor digitorum profundus to those of the subjacent Flexor digitorum superficialis after the tendons of the former have passed through the latter.