The major portion of this work was done in the Department of Anatomy and the Division of Otolaryngology, University of California, San Francisco Medical Center.
Studies on the innervation of the stapedius muscle of the cat†
Article first published online: 3 FEB 2005
Copyright © 1964 Wiley-Liss, Inc.
The Anatomical Record
Volume 149, Issue 1, pages 157–171, May 1964
How to Cite
Blevins, C. E. (1964), Studies on the innervation of the stapedius muscle of the cat. Anat. Rec., 149: 157–171. doi: 10.1002/ar.1091490114
Supported by the John C. and Edward Coleman Memorial Fund, Department of Otolaryngology, University of California, San Francisco Medical Center and State of Washington Initiative 171 Funds for Research in Biology and Medicine.
- Issue published online: 3 FEB 2005
- Article first published online: 3 FEB 2005
A study of nerve-muscle relations and fine innervation patterns is reported for the stapedius muscle of the cat. Gross relations of the muscle to its associated nerves and other middle ear structures are shown by illustrations. Histologic features of innervation are studied with the Bodian silver method. the thiocholine technique, and iron hematoxylin and osmic acid stains.
The muscle is richly supplied by 3 to 4 facial nerve branches in which no axons are found above 8 μ and the majority are unimodally grouped at 2–4 μ. The auricular nerve of the vagus does not penetrate the muscle. Three to four distinct zone is of fasciculi are found whose muscle fibers are 14–20 μ in diameter. Each zone is supplied by primary nerves whose branches do not exhibit terminal overlap or multiple innervation of muscle fibers. Short terminal axons lead to motor and plates from all intramuscular nerve branches. Nerve branches and motor end plates are confined to the basal third of the muscle. Sensory endings are not detected within the muscle or its tendon. It is estimated that each motor neuron supplies no more than five muscle fibers but more probably three or less.