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Structural and functional heterogeneity in an insect muscle.

D R Stokes, R K Josephson, R B Price

The Journal of Experimental Zoology

|November 1, 1975

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The dorsal longitudinal muscle (DLM) of singing katydids has distinct bands with specialized structures and innervation. These differences explain how different muscle bands perform varied functions, from rapid singing to slower postural movements.

Area of Science:

Insect physiology
Muscle biology
Neuroethology

Background:

Singing katydids possess neurogenic muscles capable of extremely high contraction frequencies (up to 212 Hz).
The dorsal longitudinal muscle (DLM) in Neoconocephalus robustus is crucial for sound production and exhibits regional specializations.

Purpose of the Study:

To investigate the relationship between the ultrastructural features of different DLM bands and their mechanical-electrical performance.
To understand how muscle fiber structure and innervation patterns contribute to specialized functions in insect sound production.

Main Methods:

Comparative analysis of the ultrastructure of ventral, medial, and dorsal bands of the katydid DLM.
Examination of motoneuron innervation patterns for each DLM band.

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Correlation of structural data with known mechanical and electrical properties of muscle contractions.

Main Results:

Ventral and medial DLM bands feature short sarcomeres, abundant sarcoplasmic reticulum (SR), and high mitochondrial content, consistent with fast, metabolically active but weaker contractions.
The dorsal DLM band has longer sarcomeres, less SR, and larger myofibrils, suggesting a slower but stronger contractile capacity.
Differential innervation by fast and slow motoneurons further distinguishes muscle band function, with the dorsal band showing structural homogeneity despite varied innervation.

Conclusions:

The distinct ultrastructural and innervation characteristics of DLM bands in Neoconocephalus robustus directly correlate with their specialized roles in singing and potentially postural adjustments.
This study elucidates the functional morphology of insect singing muscles, highlighting how structural adaptations enable high-frequency, precise movements.