Motor control of the mandible closer muscle in ants

Jürgen Paul, Wulfila Gronenberg

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Despite their simple design, ant mandible movements cover a wide range of forces, velocities and amplitudes. The mandible is controlled by the mandible closer muscle, which is composed of two functionally distinct subpopulations of muscle fiber types: fast fibers (short sarcomeres) and slow ones (long sarcomeres). The entire muscle is controlled by 10-12 motor neurons, 4-5 of which exclusively supply fast muscle fibers. Slow muscle fibers comprise a posterior and an antero-lateral group, each of which is controlled by 1-2 motor neurons. In addition, 3-4 motor neurons control all muscle fibers together. Simultaneous recordings of muscle activity and mandible movement reveal that fast movements require rapid contractions of fast muscle fibers. Slow and subtle movements result from the activation of slow muscle fibers. Forceful movements are generated by simultaneous co-activation of all muscle fiber types. Retrograde tracing shows that most dendritic arborizations of the different sets of motor neurons share the same neuropil in the subesophageal ganglion. In addition, fast motor neurons and neurons supplying the lateral group of slow closer muscle fibers each invade specific parts of the neuropil that is not shared by the other motor neuron groups. Some bilateral overlap between the dendrites of left and right motor neurons exists, particularly in fast motor neurons. The results explain how a single muscle is able to control the different movement parameters required for the proper function of ant mandibles.

Original languageEnglish (US)
Pages (from-to)255-267
Number of pages13
JournalJournal of Insect Physiology
Volume48
Issue number2
DOIs
StatePublished - 2002

Fingerprint

Ants
motor neurons
Mandible
muscle fibers
Formicidae
Motor Neurons
Muscles
muscles
sarcomeres
Sarcomeres
Neuropil
subesophageal ganglia
dendrites
Neuronal Plasticity
neurons
Muscle Contraction
Dendrites
Ganglia
Neurons

Keywords

  • Force measurement
  • Insect
  • Movement velocity
  • Muscle fiber types
  • Muscle recording
  • Neuroanatomy

ASJC Scopus subject areas

  • Insect Science
  • Physiology

Cite this

Motor control of the mandible closer muscle in ants. / Paul, Jürgen; Gronenberg, Wulfila.

In: Journal of Insect Physiology, Vol. 48, No. 2, 2002, p. 255-267.

Research output: Contribution to journalArticle

@article{b67611dbdedd42098803b0bb07dac479,
title = "Motor control of the mandible closer muscle in ants",
abstract = "Despite their simple design, ant mandible movements cover a wide range of forces, velocities and amplitudes. The mandible is controlled by the mandible closer muscle, which is composed of two functionally distinct subpopulations of muscle fiber types: fast fibers (short sarcomeres) and slow ones (long sarcomeres). The entire muscle is controlled by 10-12 motor neurons, 4-5 of which exclusively supply fast muscle fibers. Slow muscle fibers comprise a posterior and an antero-lateral group, each of which is controlled by 1-2 motor neurons. In addition, 3-4 motor neurons control all muscle fibers together. Simultaneous recordings of muscle activity and mandible movement reveal that fast movements require rapid contractions of fast muscle fibers. Slow and subtle movements result from the activation of slow muscle fibers. Forceful movements are generated by simultaneous co-activation of all muscle fiber types. Retrograde tracing shows that most dendritic arborizations of the different sets of motor neurons share the same neuropil in the subesophageal ganglion. In addition, fast motor neurons and neurons supplying the lateral group of slow closer muscle fibers each invade specific parts of the neuropil that is not shared by the other motor neuron groups. Some bilateral overlap between the dendrites of left and right motor neurons exists, particularly in fast motor neurons. The results explain how a single muscle is able to control the different movement parameters required for the proper function of ant mandibles.",
keywords = "Force measurement, Insect, Movement velocity, Muscle fiber types, Muscle recording, Neuroanatomy",
author = "J{\"u}rgen Paul and Wulfila Gronenberg",
year = "2002",
doi = "10.1016/S0022-1910(01)00171-8",
language = "English (US)",
volume = "48",
pages = "255--267",
journal = "Journal of Insect Physiology",
issn = "0022-1910",
publisher = "Elsevier Limited",
number = "2",

}

TY - JOUR

T1 - Motor control of the mandible closer muscle in ants

AU - Paul, Jürgen

AU - Gronenberg, Wulfila

PY - 2002

Y1 - 2002

N2 - Despite their simple design, ant mandible movements cover a wide range of forces, velocities and amplitudes. The mandible is controlled by the mandible closer muscle, which is composed of two functionally distinct subpopulations of muscle fiber types: fast fibers (short sarcomeres) and slow ones (long sarcomeres). The entire muscle is controlled by 10-12 motor neurons, 4-5 of which exclusively supply fast muscle fibers. Slow muscle fibers comprise a posterior and an antero-lateral group, each of which is controlled by 1-2 motor neurons. In addition, 3-4 motor neurons control all muscle fibers together. Simultaneous recordings of muscle activity and mandible movement reveal that fast movements require rapid contractions of fast muscle fibers. Slow and subtle movements result from the activation of slow muscle fibers. Forceful movements are generated by simultaneous co-activation of all muscle fiber types. Retrograde tracing shows that most dendritic arborizations of the different sets of motor neurons share the same neuropil in the subesophageal ganglion. In addition, fast motor neurons and neurons supplying the lateral group of slow closer muscle fibers each invade specific parts of the neuropil that is not shared by the other motor neuron groups. Some bilateral overlap between the dendrites of left and right motor neurons exists, particularly in fast motor neurons. The results explain how a single muscle is able to control the different movement parameters required for the proper function of ant mandibles.

AB - Despite their simple design, ant mandible movements cover a wide range of forces, velocities and amplitudes. The mandible is controlled by the mandible closer muscle, which is composed of two functionally distinct subpopulations of muscle fiber types: fast fibers (short sarcomeres) and slow ones (long sarcomeres). The entire muscle is controlled by 10-12 motor neurons, 4-5 of which exclusively supply fast muscle fibers. Slow muscle fibers comprise a posterior and an antero-lateral group, each of which is controlled by 1-2 motor neurons. In addition, 3-4 motor neurons control all muscle fibers together. Simultaneous recordings of muscle activity and mandible movement reveal that fast movements require rapid contractions of fast muscle fibers. Slow and subtle movements result from the activation of slow muscle fibers. Forceful movements are generated by simultaneous co-activation of all muscle fiber types. Retrograde tracing shows that most dendritic arborizations of the different sets of motor neurons share the same neuropil in the subesophageal ganglion. In addition, fast motor neurons and neurons supplying the lateral group of slow closer muscle fibers each invade specific parts of the neuropil that is not shared by the other motor neuron groups. Some bilateral overlap between the dendrites of left and right motor neurons exists, particularly in fast motor neurons. The results explain how a single muscle is able to control the different movement parameters required for the proper function of ant mandibles.

KW - Force measurement

KW - Insect

KW - Movement velocity

KW - Muscle fiber types

KW - Muscle recording

KW - Neuroanatomy

UR - http://www.scopus.com/inward/record.url?scp=0036188834&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036188834&partnerID=8YFLogxK

U2 - 10.1016/S0022-1910(01)00171-8

DO - 10.1016/S0022-1910(01)00171-8

M3 - Article

VL - 48

SP - 255

EP - 267

JO - Journal of Insect Physiology

JF - Journal of Insect Physiology

SN - 0022-1910

IS - 2

ER -