A stereotactic apparatus for medical procedures, comprising: a securing arm comprising a first end, a second end, a long axis, and a short axis; a connecting arm comprising a first end, a second end, a long axis, and a short axis; a positioning arm comprising a first end, a second end, a long axis, and a short axis; and a guiding arm comprising a first end, a second end, a long axis, and a short axis; wherein the first end of the connecting arm is attached to the second end of the securing arm, the second end of the connecting arm is attached to the first end of the positioning arm, the long axis of the connecting arm is perpendicular to the long axis of each of the securing arm and positioning arm, the first end of the securing arm and the second end of the positioning arm can be positioned to extend in the same direction away from the connecting arm, the positioning arm is attached at its second end to the second end of the guiding arm, such that the positioning arm and guiding arm are perpendicular to one another, and the guiding arm can be positioned such that the axis along which its long axis is situated is perpendicular to but does not intersect with the axes along which the long axis of the securing arm and the long axis of the connecting arm are respectively situated, and wherein the guiding arm further comprises an instrument attaching component configured to slide along the long axis of the guiding arm, wherein the sliding motion is controlled by a dial situated at the first end of the guiding arm wherein the securing arm further comprises one or more clamps on its first end, and wherein the one or more clamps are configured to attach to an arm of a tissue retractor. a securing arm comprising a first end, a second end, a long axis, and a short axis; a connecting arm comprising a first end, a second end, a long axis, and a short axis; a positioning arm comprising a first end, a second end, a long axis, and a short axis; and a guiding arm comprising a first end, a second end, a long axis, and a short axis; wherein the first end of the connecting arm is attached to the second end of the securing arm, the second end of the connecting arm is attached to the first end of the positioning arm, the long axis of the connecting arm is perpendicular to the long axis of each of the securing arm and positioning arm, the first end of the securing arm and the second end of the positioning arm can be positioned to extend in the same direction away from the connecting arm, the positioning arm is attached at its second end to the second end of the guiding arm, such that the positioning arm and guiding arm are perpendicular to one another, and the guiding arm can be positioned such that the axis along which its long axis is situated is perpendicular to but does not intersect with the axes along which the long axis of the securing arm and the long axis of the connecting arm are respectively situated, and wherein the guiding arm further comprises an instrument attaching component configured to slide along the long axis of the guiding arm, wherein the sliding motion is controlled by a dial situated at the first end of the guiding arm wherein the securing arm further comprises one or more clamps on its first end, and wherein the one or more clamps are configured to attach to an arm of a tissue retractor.