Abstract
The presence of nerve fibres in the medulla of the chick thymus has been investigated ultrastructurally. Unmyelinated nerve fibres were found not only in the perivascular space but also among the myoid cells. The nerve fibres were situated in close proximity to the myoid cells. The unmyelinated axons, containing predominantly clear vesicles and some dense-core vesicles, were found in recesses of the plasmalemma of the Schwann cell. Contacts between nerve fibres and fibroblasts were also observed.
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