October 1962
Volume 1, Issue 5
Articles  |   October 1962
Fine Structure of the Human Ciliary Muscle
Author Affiliations
    Department of Ophthalmology, College of Physicians and Surgeons, Columbia University, New York, N. Y.; Fellow, Fight for Sight Research Fellowship, financed by the Bob Hope Fight for Sight Fund of the National Council to Combat Blindness, Inc., New York City.
Investigative Ophthalmology & Visual Science October 1962, Vol.1, 587-608. doi:
  • Views
  • PDF
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      TOYOKO ISHIKAWA; Fine Structure of the Human Ciliary Muscle. Invest. Ophthalmol. Vis. Sci. 1962;1(5):587-608.

      Download citation file:

      © ARVO (1962-2015); The Authors (2016-present)

  • Supplements
This content is PDF only. Please click on the PDF icon to access.

The ciliary muscle in human eyes consists of bundles of muscle cells surrounded by flattened connective tissue cells. Each bundle generally contains unmyelinated nerve fibers accompanied by Schwann cells and a few connective tissue components. Some of the nerve fibers contain many vesicles characteristic of nerve endings. The nerve fibers are, in a few cases, in very close apposition to the muscle cell membrane, but in most instances they are separated by basement membrane material. Single muscle cells are, in general, cylindricaland entirely wrapped in a basement membrane except at small areas of contact with other muscle cells where it is absent. The central region of these cells contains a slender nucleus, centrosomes, Golgi apparatus, endoplasmic reticulum, and abundant mitochondria. Many myofilaments oriented parallel to the length of the cell axis are found in the cytoplasm. Elongated patches of dense material are observed between the myofilaments, particularly in contact with cell membranes. Numerous pinocytic vesicles occur along the muscle cell membrane. In the spaces between the bundles, collagen, very thin collagen-like (reticular) and elastic fibers, myelinated and unmyelinated nerve fibers, and capillaries are seen. The capillary walls are thicker than those of the ciliary processes, and lack pores.


This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.