Athena Vale
Insects have muscles, and they use them in fascinating ways. For example, bees use their wing muscles to shake flowers and cover themselves in pollen, which they then use to feed their young. Beetles, meanwhile, use their muscles to wrestle one another for the chance to court a female. Insects' muscles are structurally similar to vertebrate muscles, but insects like bees, flies, and some beetles have specialised myogenic muscles that allow one nerve pulse to initiate multiple contractions, increasing the contraction speed. Insects' muscles are attached to their hard skin, or exoskeleton, rather than to bones.
| Characteristics | Values |
|---|---|
| Insect muscles | Similar to vertebrate muscles |
| Wing muscles | Allow insects to fly and shake flowers |
| Muscle contractions | One nerve pulse can cause multiple contractions, increasing contraction speed |
| Muscle strength | Proportionally stronger than vertebrate muscles |
| Muscle structure | Muscles attach to hard skin instead of bones |
| Leg muscles | Used for walking, jumping, and steering |
| Flight muscles | Two sets of major flight muscles in the thorax: DLM and DVM |
| Muscle temperature | Must be maintained above a certain temperature to enable flight |
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What You'll Learn
Insect muscles are similar to vertebrate muscles
Insects have a complex nervous system that incorporates a variety of internal and external sensory information. The basic component of this system is the neuron or nerve cell, which is also the basic component of the vertebrate nervous system. In both insects and vertebrates, the neuron is made up of a dendrite with two projections that receive stimuli and an axon, which transmits information to another neuron or organ, like a muscle. Neurotransmitters such as acetylcholine and dopamine are released at the synapses in both insects and vertebrates.
The muscles of insects and vertebrates also share similarities in their actin genes. Actin genes are specifically expressed in the muscles of insects such as Bombyx and Drosophila. Insect muscle actins form a family of related proteins characterized by about 10 muscle-specific amino acids. Insect muscle actins have diverged from cytoplasmic actins and form a monophyletic group of closely related proteins that includes insect and vertebrate cytoplasmic actins.
Insects' flight muscles are another example of similarities between insect and vertebrate muscles. To fly, insects need to overcome gravity and drag. Most insects fly by beating their wings, which are powered by either direct or indirect flight muscles. Direct flight muscles are attached to the wings, while indirect flight muscles are attached to a highly flexible box-like thorax. In both cases, the muscles contract to generate an upward or downward stroke, allowing the insect to fly.
The structure and function of insect flight muscles have evolved to pursue maximal efficiency. For example, asynchronous IFMs have the ability to stretch and activate, allowing insects to beat their wings even when calcium levels do not fluctuate. This system of "distributed information processing" relieves the central nervous system and allows insects to modulate their wing-beat frequency.
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Insect flight muscles
Direct Flight Muscles
Direct flight muscles are attached to the base of the wing inside the pivotal point. The upward stroke is generated by the contraction of these muscles. Outside the pivotal point, the downward stroke is generated through the contraction of muscles that extend from the sternum to the wing. Dragonflies, damselflies, and mayflies have direct flight musculature.
Indirect Flight Muscles
Indirect flight muscles are attached to the tergum and sternum. Contraction of these muscles pulls down the tergum and base of the wing, which levers the outer or main part of the wing in an upward stroke. A second set of muscles, running from the back to the front of the thorax, powers the downbeat, deforming the box-like thorax and lifting the tergum. This type of musculature is found in butterflies and most other insects.
Wingbeat Frequency
The frequency of wingbeats is determined by the mechanical resonant frequency of the thorax and the wings. Insects can modulate this frequency by varying the frequency of nerve impulses. Insects with asynchronous muscles can beat their wings much faster than those with synchronous muscles. This is because asynchronous muscles can contract more than once per nerve impulse, while synchronous muscles contract only once per nerve impulse.
Temperature Regulation
Most flying insects must maintain their flight muscles above a certain temperature to generate enough power for flight. Larger insects can increase the temperature of their flight muscles by shivering or vibrating their wing muscles. Moths and bumblebees, insulated by scales and hair, can raise their flight muscle temperature 20–30 °C above the environmental temperature.
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Insect leg muscles
Insects have a complex nervous system that incorporates a variety of internal physiological information, as well as external sensory information. This system controls their sensory, motor, and physiological processes. The nervous system activates muscles in modular, synergistic groups, which simplifies the regulation of limbs with multiple degrees of freedom.
The leg muscles of insects are controlled by this complex nervous system, which activates muscles in synergist groups. Campaniform sensilla, a type of mechanoreceptor, play an important role in this process. These sensilla are sense organs that detect strains in the exoskeleton and encode forces as cuticular strains. When stimulated, they activate specific leg muscles, such as the retractor unguis, which generates substrate grip, and the tibial flexor, which produces an inward pull.
In insects, the task-specific reinforcement of muscle synergies is essential for rapid establishment of substrate adhesion, providing a stable point for force generation. This is particularly important for insects to maintain stability and control during movement. The activation of leg muscles at different leg joints as synergists allows insects to coordinate their movements effectively.
Additionally, insects use their leg muscles for various functions, such as walking, running, jumping, and wrestling. The specific functions of each leg can vary, with the hind legs providing power, the middle legs used for steering, and the front legs used to sense the environment and navigate obstacles.
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Insect wing muscles
Insects are the only group of animals other than vertebrates to have successfully evolved flight. Insect wings are adult outgrowths of the insect exoskeleton, strengthened by a number of longitudinal veins, which often have cross-connections forming "cells" in the membrane. The wing areas are subdivided by fold lines along which the wing can fold, and flexion lines along which the wing can flex during flight.
Insects with direct flight muscles have muscles that are directly attached to their wings. Direct flight muscles generate the upward stroke by the contraction of the muscles attached to the base of the wing inside the pivotal point. Outside the pivotal point, the downward stroke is generated through the contraction of muscles that extend from the sternum to the wing.
Insects with indirect flight muscles have muscles that are attached to the tergum and sternum. Contraction of these muscles pulls down the tergum and base of the wing, leveraging the outer or main part of the wing in upward strokes. A second set of muscles, which run from the back to the front of the thorax, powers the downbeat. This deforms the box-like thorax and lifts the tergum.
The flight muscles of insects are striated muscles with a similar sarcomeric structure and basic mechanisms of contraction and relaxation to those of vertebrates. Insects that beat their wings less than 100 times a second use synchronous muscle, which contracts once for every nerve impulse. Insects that beat their wings more rapidly use asynchronous muscle, which contracts more than once per nerve impulse. This is achieved by the muscle being stimulated to contract again by a release in tension.
The body temperature of butterflies and grasshoppers in flight may be 5 °C or 10 °C above the environmental temperature, while moths and bumblebees may raise their flight muscle temperature 20–30 °C above the environmental temperature. Most flying insects must maintain their flight muscles above a certain temperature to generate enough power to fly. Shivering, or vibrating the wing muscles, allows larger insects to actively increase the temperature of their flight muscles, enabling flight.
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Insect muscle physiology
Insects have a complex nervous system that incorporates a variety of internal and external sensory information. The basic component of this system is the neuron or nerve cell, which transmits information to other neurons or organs, such as muscles. The sensory, motor, and physiological processes of insects are controlled by the central nervous system, which consists of a brain, a ventral nerve cord, and a subesophageal ganglion.
The muscular system of insects ranges from a few hundred to a few thousand muscles, all of which are striated muscles. These muscles are attached to the body wall and can move different body parts, including appendages such as wings. The muscle fiber has many cells with a plasma membrane and an outer sheath or sarcolemma. The sarcolemma can make contact with the tracheole, which carries oxygen to the muscle fiber. Myofibrils, comprising a fine actin filament enclosed between a thick pair of myosin filaments, run the length of the muscle fiber.
Flight muscles are the most specialized category of muscle in insects and are capable of rapid contractions. Nerve impulses are required to initiate these contractions and, therefore, flight. These muscles are also known as neurogenic or synchronous muscles due to the one-to-one correspondence between action potentials and muscle contractions. Insects with higher wing stroke frequencies have asynchronous muscles, which contract more frequently than the rate at which the nerve impulse reaches them.
Insect flight muscles have been an important factor in the prosperity of insects, as they have allowed insects to access new habitats and food sources. The small body size of insects, coupled with their ability to fly, has allowed them to exploit niches unutilized by larger animals. However, this has also presented a challenge, as insects must beat their wings at high frequencies to achieve flight. Insects have overcome this problem by developing asynchronous flight muscles, a specialized form of striated muscle capable of oscillating at extremely high frequencies.
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Frequently asked questions
Yes, insects have muscles.
Insect muscles are similar to vertebrate muscles. However, insects like bees, flies, and some beetles have specialised "myogenic" muscles. Insect muscles are attached to a hard skin or exoskeleton, instead of bones.
Insect muscles work in conjunction with the nervous system. The basic component is the neuron or nerve cell, which transmits information to another neuron or organ, like a muscle.
Insect wings do not have muscles or nerves. They are controlled by muscles located inside the body that operate a system of marionette-like pulleys within a complex hinge at the base of the wing.
Insects use their muscles for various purposes, including flying, walking, wrestling, and feeding their young.
