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Related Concept Videos

Design Example: Frog Muscle Response01:14

Design Example: Frog Muscle Response

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A student is tasked to work on an intriguing experiment involving an RL (Resistor-Inductor) circuit to study the muscle response of a frog's leg to electrical stimulation. The RL circuit plays a crucial role in this experiment, providing the means to control and measure the electrical impulses that trigger muscle contraction.
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De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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Updated: Apr 28, 2026

Simultaneous Pre- and Post-synaptic Electrophysiological Recording from Xenopus Nerve-muscle Co-cultures
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Cranial muscle development in frogs with different developmental modes: direct development versus biphasic

Janine M Ziermann, Rui Diogo

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    |May 31, 2014
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    Anuran cranial muscle development was studied in aquatic and direct-developing frogs. Despite lacking a free-swimming tadpole stage, direct-developing Eleutherodactylus coqui shows preserved developmental mechanisms for adult cranial muscles.

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    Area of Science:

    • Developmental biology
    • Comparative anatomy
    • Evolutionary developmental biology

    Background:

    • Anuran development typically involves a free-swimming larval stage and metamorphosis.
    • Cranial muscle development and adult morphology vary across anuran species with different life histories.
    • Eleutherodactylus coqui exhibits direct development, bypassing a free-swimming tadpole stage.

    Purpose of the Study:

    • To investigate and compare cranial muscle development and adult morphology in anurans with diverse life histories.
    • To understand the developmental mechanisms underlying cranial muscle formation in direct-developing frogs.
    • To determine if developmental pathways are conserved despite the absence of a free-swimming larval stage.

    Main Methods:

    • Comparative analysis of cranial muscle development and adult morphology.
    • Study of three anuran species: Xenopus laevis (aquatic), Rana (Lithobates) pipiens (biphasic), and Eleutherodactylus coqui (direct-developing).
    • Observation of muscle development patterns, including the mandibular and hyoid arches.

    Main Results:

    • Adult cranial muscle morphology showed minimal differences across the studied species.
    • Cranial muscle development in E. coqui shared similarities with Xenopus and Rana (Lithobates).
    • E. coqui displayed a mid-metamorphic pattern for the appearance of certain muscles, indicating cryptic metamorphosis.

    Conclusions:

    • Direct-developing anurans like E. coqui retain conserved developmental mechanisms for cranial muscles.
    • The absence of a free-swimming larval stage does not equate to a complete loss of developmental pathways.
    • Cryptic metamorphosis in E. coqui preserves the majority of developmental processes for functional adult cranial muscles.