are the muscles responsible for movement in the desired direction
The direction of pull of the muscles forms a 23° angle relative to the visual axis in the primary position, giving rise to secondary and tertiary functions. The secondary action of vertical rectus muscles is torsion. The superior rectus is an incyclotorter, and the inferior rectus is an excyclotorter. Types of Muscles. • Prime mover – responsible for movement. in muscle group. • Antagonist - oppose or reverse a. movement. – When a prime mover is active its antagonist is. relaxed. • ex: biceps and triceps. The muscles are attached to the sclera of the eye at one end and are anchored to the bony orbit of the eye at their opposite ends. Contraction of the muscles produce movement of the eyes within the orbit. The cranial lower motor neurons innervate these muscles and thereby control their contractions. Figure 8.1. Muscle Movements, Types. and Names. Chapter 6. Objectives. 1. Define origin, insertion, prime mover, antagonist, synergist and fixator as they. relate to muscles. 2. Identify the different types of body. movements. 3. List some of the criteria for naming. Each muscle action is listed in the Table of Contents. You can read about each movement as you travel down the page or you may go directly to a movement for a description by clicking on the blue title. An asterisk (*) indicates that a movie can be played at that location. Click on the blue heading to see the movie. Pronation is the movement of crossing the radius over the ulna. This movement results in the dorsal surface of the hand turning forward, or prone. Supination is the opposite action, wherein the radius is uncrossed and the palmar surface of the hand is returned to the anatomical position, or supine (forward). The actions of these two muscles are antagonistic: one muscle must relax while the other contracts to execute horizontal eye movements. Four other extraocular muscles working together control vertical eye movements and eye rotation around the mid-orbital axis (Figure 8.1, right). Contraction of the. The primary muscle that moves an eye in a given direction is known as the agonist. A muscle in the same eye that moves the eye in the same direction as the agonist is known as the synergist, while a muscle in the same eye that moves the eye in the opposite direction of the agonist is the antagonist. Inversion is the action of turning the sole of the foot inward, towards the opposite foot. Eversion is the movement of turning the sole of the foot outward, away from the midline. Movements of the Hand In the hand and foot, a specific application is utilized for the general terms abduction and adduction . The maximum weight you can perform one rep of a lift with is called a one rep max if that's what you mean. APEX(: MUSCLE STRENGTH.
Yes, the primary muscle that moves an eye in a given direction is known as the agonist.