Vasco Nunez de Balboa went on to discover new lands and was appointed governor of different regions in the Americas. One of his biggest achievements was that of crossing over the southern part of the continent by crossing the present day Isthmus of Panama.
Muscles of the eyes. The are six muscles of the eyes responsible for movement of the eye. These muscles function in Agonist and Antagonist pairs enabling us to move our eyeballs in the cardinal directions, up, down, left and right. There are six muscles which are responsible for controlling the movement of the eyeballs.
For each eye, six muscles work together to control eye position and movement. Two extraocular muscles, the medial rectus and lateral rectus, work together to control horizontal eye movements (Figure 8.1, left). Contraction of the medial rectus pulls the eye towards the nose (adduction or medial movement).