Ultrathin cross section through an innervated myotendinous cylinder of lateral rectus muscle in patients with paralytic strabismus. (A) The IMC is encapsulated by a loose connective tissue (C). Inside the capsule, muscle fiber (MF) looks atrophic, and Z-disc (arrow) shows disoriented and irregular features. Myelinated nerve fiber (arrowhead). Scale bar, 5 µm. (B) Detailed image of the nerve terminal contacting the muscle fiber (MF). The nerve axon (A) looks normal, but cytoplasmic process of a Schwann cell (S) is flattened (arrow). Scale bar, 5 µm. Innervated myotendinous cylinders alterations in human extraocular muscles in patients with strabismus. Park SE, Sa HS, Oh SY - Korean journal of ophthalmology : KJO (2009). Not Altered. CC.