RESUMO
Trochleas obtained from fresh surgical specimens, autopsy material, and cadavers were studied by means of dissection, light microscopy, and electron microscopy (scanning and transmission). A bursa-like structure that has not previously been described lines the inner surface of the cartilagenous trochlea. A fibrillar, vascular sheath surrounds the intratrochlear superior oblique tendon. This portion of the superior oblique tendon consists of discrete fibers with few, interfibrillar connections. Each superior oblique tendon fiber is thought to move through the trochlea by means of a sliding action with the central fibers undergoing the maximum excursion.
Assuntos
Cartilagem/anatomia & histologia , Músculos Oculomotores/anatomia & histologia , Órbita/anatomia & histologia , Cartilagem/fisiologia , Cartilagem/ultraestrutura , Humanos , Microscopia Eletrônica , Microscopia Eletrônica de Varredura , Músculos Oculomotores/fisiologia , Músculos Oculomotores/ultraestruturaRESUMO
A review of the records of 65 patients who had surgery for congenital blepharoptosis of the upper eyelid during a three-year period revealed the preoperative presence of anisometropia, strabismus, or amblyopia in 19 patients. Postoperatively, ten of the 65 patients developed or increased their astigmatism in the operated eye. In four of these patients amblyopia attributed to this postoperative astigmatism developed. The results of our study suggest that blepharoptosis surgery done in the first few years of life may contribute to the development of astigmatism and amblyopia in some patients.
