Anchors for securing a rod to a vertebral member

An anchor to secure a rod to a vertebral member comprising:

• a fastener including a distal end adapted to be connected to the vertebral member and a proximal end;
• and
• a receiver operatively connected to the proximal end of the fastener and including a channel extending through the receiver such that the receiver extends around the channel, the channel including a longitudinal axis, the receiver further including a convex section that extends into the channel towards the longitudinal axis, the receiver and convex section being formed in a unitary one-piece construction.

An anchor to secure a rod to a vertebral member comprising:

• a fastener including a distal end adapted to be connected to the vertebral member and a proximal end;
• and
• a receiver operatively connected to the proximal end of the fastener, the receiver including a channel sized to receive the rod with the channel including a longitudinal axis, the channel comprises a medial first section of reduced size that tapers both inwardly and outwardly relative to the longitudinal axis and respective end sections of relatively larger size, the receiver formed in a unitary one-piece construction.