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Muscle spindles in the rhesus monkey platysma.

Christian Albrecht May1, Kerstin Mätz-Rensing2, Daniel Aschoff2

  • 1Department of Anatomy, Medical Faculty Carl Gustav Carus, TU Dresden, Dresden, Germany.

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|December 11, 2021
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Summary

The rhesus monkey platysma has two parts with similar muscle fiber morphology. Muscle spindles, found near the cheek pouch, may sense pouch fullness, not mimicry.

Keywords:
cheek pouchmuscle spindleplatysmarhesus monkeystriated muscle

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Area of Science:

  • Anatomy
  • Neuroscience
  • Primate Musculature

Background:

  • The platysma muscle in rhesus monkeys comprises two distinct parts: platysma myoides and platysma cervicale.
  • The platysma cervicale's unique anatomical position interfaces with the cheek pouch.

Purpose of the Study:

  • To investigate the muscle fiber morphology of the rhesus monkey platysma.
  • To determine the distribution and composition of muscle spindles within the platysma.
  • To elucidate the potential sensory function of these muscle spindles.

Main Methods:

  • Histological examination of platysma muscle fibers.
  • Microscopic analysis of muscle spindle distribution and morphology.
  • Comparative analysis between platysma myoides and platysma cervicale.

Main Results:

  • Muscle fiber morphology was consistent across both platysma myoides and platysma cervicale.
  • Muscle spindles were exclusively identified in the platysma cervicale regions associated with the cheek pouch.
  • These muscle spindles contained solely nuclear chain fibers.

Conclusions:

  • The rhesus monkey platysma exhibits uniform muscle fiber characteristics.
  • The localized presence of muscle spindles in the cheek pouch-associated regions suggests a specialized sensory role.
  • It is hypothesized that these spindles detect cheek pouch distension rather than proprioceptive mimicry.