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The opercularis muscle is a muscle found in amphibians such as the bullfrog (Rana catesbeiana) and the tiger salamander (Ambystoma tigrinum). It connects a movable otic element (the operculum) to the pectoral girdle and plays a role in the reception of ground vibrations. The muscle is characterised by slow contractions and the ability to retain high levels of tension for several minutes. Its function is closely associated with the amphibian's vibratory sensitivity and seismic sensitivity.
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What You'll Learn
The opercularis muscle is a very slowly contracting muscle
The opercularis muscle is part of the opercularis system, which acts to produce motion in the operculum, creating fluid motion within the inner ear. This motion stimulates various end organs of the inner ear, such as the saccule, lagena, and amphibian papilla. The operculum and opercularis muscle form a lever system, with a narrow connection between them acting as a fulcrum.
The slow contraction of the opercularis muscle is important for its sensory function. When tensed, it transmits motion produced by vibrations to the operculum, which then moves relative to the inner ear fluids. This allows the amphibian to detect ground vibrations.
The opercularis muscle is composed of tonic muscle fibres, which enable it to sustain contraction over long periods. This is supported by its slow velocity of contraction, slow rate of tension development, fatigue resistance, and slow rate of relaxation. The muscle's fibre composition indicates that it is constructed to remain contracted for extended periods, supporting its proposed functional role in audition.
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It connects a movable otic element to the pectoral girdle
The amphibian opercularis muscle is a movable otic element that connects the operculum to the pectoral girdle. It is involved in the reception of ground vibrations. The operculum and opercularis muscle form a lever system, with a narrow connection between the two acting as a fulcrum. This allows the operculum to move in response to forces applied via the muscle.
The opercularis muscle is a very slow contracting muscle, taking about 10 seconds to attain maximum isometric tension when stimulated at 100 Hz. It can retain high levels of tension for several minutes, and following stimulation, it takes about 4-6 seconds to relax. The slow velocity of contraction, slow rate of tension development, fatigue resistance, and slow rate of relaxation indicate that the opercularis muscle consists mostly of tonic muscle fibres.
The tonicity of the opercularis muscle allows tensile forces produced by substrate vibrations or other mechanical energy applied to the forelimb to be transmitted to the operculum. This results in fluid motion within the inner ear, stimulating various end organs such as the saccule, lagena, and amphibian papilla.
The opercularis muscle is specialized for slow but prolonged contractions, and tension is crucial to its sensory function. A tensed opercularis muscle transmits motion produced by vibrations to the operculum, causing it to move relative to the inner ear fluids.
The opercularis muscle of the bullfrog Rana catesbeiana has been studied extensively, and it has been found to differ from that of the tiger salamander. In the bullfrog, the anterior tonic part of the opercularis/levator scapulae superior complex is enlarged, while in the tiger salamander, the entire levator scapulae superior muscle inserts on the operculum.
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It is specialised for slow but prolonged contractions
The opercularis muscle is a very slow contracting muscle. It takes about 10 seconds to attain maximum isometric tension when stimulated at 100 Hz. The muscle can retain high levels of tension for several minutes, and following stimulation, it has a time to half-relaxation of about 4 to 6 seconds. This slow velocity of contraction, slow rate of tension development, fatigue resistance, and slow rate of relaxation indicate that the opercularis muscle consists mostly of tonic muscle fibres.
The opercularis muscle is specialised for slow but prolonged contractions. The muscle's tension is important for its sensory function. When tensed, the opercularis muscle transmits motion of the forelimb, produced by vibrations, to the operculum. This motion of the operculum produces fluid motion within the inner ear.
The opercularis muscle forms a lever system with the operculum. The operculum is a movable otic element that connects to the pectoral girdle. The muscle inserts on the operculum, increasing the moment arm through which it acts.
The opercularis muscle's slow contraction and relaxation support its function in the reception of ground vibrations. The muscle's tonicity allows tensile forces produced by substrate vibrations to be effectively transmitted to the operculum. The elasticity of the connective tissue holding the operculum returns it to its original position.
The opercularis muscle's ability to sustain prolonged contractions is important for its role in audition and seismic sensitivity. Its slow contraction and relaxation allow it to effectively transmit vibrations and produce fluid motion within the inner ear.
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The muscle is made up of tonic muscle fibres
The opercularis muscle is an amphibian muscle that connects a movable otic element (the operculum) to the pectoral girdle. It is involved in the reception of ground vibrations. The muscle is characterised by its slow contraction, taking about 10 seconds to attain maximum isometric tension when stimulated at 100 Hz. This slow contraction is supported by the muscle's composition of mostly tonic muscle fibres. Tonicity allows tensile forces produced by substrate vibrations to be effectively transmitted to the operculum.
The opercularis muscle is a specialised, tonic portion of the levator scapulae superior muscle. Histochemical studies of the opercularis muscle in the bullfrog (Rana catesbeiana) and the tiger salamander (Ambystoma tigrinum) reveal that the muscle consists of an anterior tonic portion, a middle fast oxidative-glycolytic (FOG) twitch portion, and a posterior fast-glycolytic (FG) twitch portion. The bullfrog exhibits a higher proportion of tonic fibres compared to the tiger salamander, with these fibres representing 57.3% of the total fibre count in R. catesbeiana.
The tonic fibres in the opercularis muscle correspond to the class-5 tonic fibres as defined by Smith and Ovalle (1973). The remaining fibres in the muscle align with the class-3 "phasic" category established by the same researchers. The composition of the opercularis muscle, with its significant proportion of tonic fibres, supports the muscle's functional role in sustaining contraction over extended periods.
The opercularis muscle's tonicity and ability to maintain high tension levels for several minutes contribute to its role in seismic sensitivity. The muscle's slow contraction and relaxation rates, combined with its fatigue resistance, enable it to effectively transmit vibrations to the operculum, resulting in fluid motion within the inner ear. This transmission of vibrations facilitates the bullfrog's seismic sensitivity and vibratory reception.
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It is involved in the reception of ground vibrations
The amphibian opercularis muscle is involved in the reception of ground vibrations. It connects a movable otic element (the operculum) to the pectoral girdle. The muscle develops tension slowly, taking about 10 seconds to attain maximum isometric tension when stimulated at 100 Hz. This slow velocity of contraction, along with a slow rate of tension development, fatigue resistance, and slow rate of relaxation, indicates that the opercularis muscle consists mostly of tonic muscle fibres.
Experiments have been conducted to examine the effects of muscle tension on the reception of ground vibrations. These experiments measured inner ear microphonics and found that severing the nerve supplying the opercularis muscle resulted in slight decreases in responses to vibrations. On the other hand, artificial stimulation of the muscle after severing the nerve increased responses to vibrations across a wide frequency range.
The tonicity of the opercularis muscle allows tensile forces produced by substrate vibrations or other mechanical energy applied to the forelimb to be transmitted to the operculum. This transmission results in fluid motion within the inner ear, stimulating various end organs such as the saccule, lagena, and amphibian papilla.
The opercularis muscle is specialized for slow but prolonged contractions, and tension plays a crucial role in its sensory function. A tensed opercularis muscle effectively transmits the motion of the forelimb, caused by vibrations, to the operculum, leading to relative motion between the operculum and inner ear fluids.
Overall, the opercularis muscle's ability to sustain contraction over long periods and its role in transmitting vibrations to the inner ear fluids highlight its involvement in the reception of ground vibrations.
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Frequently asked questions
The opercularis muscle is a muscle found in amphibians such as the bullfrog (Rana catesbeiana) and the tiger salamander (Ambystoma tigrinum).
The opercularis muscle is involved in the reception of ground vibrations and has a role in seismic sensitivity. It connects a movable otic element (the operculum) to the pectoral girdle and transmits vibrations to the inner ear fluids.
The opercularis muscle is a slow-contracting muscle with a slow rate of tension development and relaxation. It can take about 10 seconds to attain maximum isometric tension and can retain high levels of tension for several minutes. The muscle consists mostly of tonic muscle fibres.
The opercularis muscle has a slower velocity of contraction compared to the iliofibularis muscle, with a Vmax of 1.81 muscle lengths s^-1 compared to 6.24 muscle lengths s^-1 for the iliofibularis muscle. The opercularis muscle is also slower to relax, with a time to half-relaxation of about 4-6 seconds.
