Publication: Fine structure of the recptors at the myotendinous junction of human extraocular muscles
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Date
1988
Authors
Sodi, A. ; Corsi, M. ; Faussone-Pellegrini, M.S ; Salvi, G.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
The myotendinous junction of the human
extraocular muscles was studied by electron microscopy.
Some peculiar receptorial structures have been found in
the majority of the samples examined. These structures
are very small and consist of 1) the terminal portion of
one muscle fibre, 2) the tendon into which it inserts and
y), within the tendon, a rich nerve arborization, whose
branches are always very close to the rnuscle component.
Only one discontinuous layer, made up of tlat cells.
which lack a basa1 lamina and often show pinocytotic
vesicles, encapsules every musculo-tendinous complex.
The tendinous component consists of amorphous ground
substance of different electron density. of collagen and
elastic fibres and is divided in compartments by ramified
cells, which make an inner capsular-like covering to the
nerve fibres. Three types of afferent nerve endings can
be identified. One type is usually more frequent than the
others, possesses a large number of neurotubules and
neurofilaments and few mitochondria and is always
surrounded by a Schwann cell which forms finger-like
processes penetrating into the axoplasm. The second
type is only partially enveloped by the Schwann cell. The
axoplasm is devoid of neurotubules and contains few
neurofilarnents, several mitochondria and groups of
small clear vesicles placed in the areas uncovered by the
glial sheath. The third one is completely surrounded by the Schwann cell, but is devoid of neurotubules and
neurofilaments and full of mitochondria. These
rnorphological features correspond well with the
probable role of these receptorial structures, which is to
ensure very exact and precise ocular movements.
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