Accessory extraocular muscle.

Accessory extraocular muscle.

Although on cover test the child maintained fixation easily with either eye, he preferred to view with the right eye. A marked left convergent strabismus was present, the deviation being greater on accommodation; the cover test also showed alternating hypertropia. When fixing with the right eye the horizontal deviation was approximately 35A with left hypertropia and when fixing with the left ey...

Retracting globe: enophthalmos and retraction due to an accessory extraocular muscle.

Extraocular muscle forces in normal human subjects.

Actively developed horizontal muscle forces and tissue stiffnesses were measured in 29 normal orthophoric volunteer subjects (18 to 33 years old) by means of noninvasive length-tension forceps. Mean active fixation force developed at 50 deg extreme gaze was 26% greater for the medial rectus (74.8 gm) than for the lateral rectus (59.1 gm). The variation of maximum active force among individuals ...

Synergistic convergence in congenital extraocular muscle misinnervation.

S ynergistic divergence is a well-established clinical condition in which abduction arises on attempted adduction, leading to simultaneous abduction of both eyes on lateral gaze. Synergistic divergence can occur as an extreme form of Duane syndrome, where most if not all oculomotor nerve branch fibers originally directed to the medial rectus muscle innervate the lateral rectus muscle. Synergist...

Functional Anatomy of the Extraocular Muscle Pulleys

2. Which statement concerning the rectus extraocular muscle pulleys is correct? a. The rectus pulleys are composed of rings of cartilage. b. The rectus pulleys are rigidly attached to the walls of the orbit. c. Each rectus pulley receives an insertion from the global layer fibers of its rectus extraocular muscle. d. The global layer fibers of the extraocular muscles do not insert on the pulleys...