Questions and Answers
What is the primary function of the splenius capitis when both sides contract?
Which of the following statements correctly describes unilaterally contracting splenius muscles?
Which nerves provide innervation to the splenius capitis and splenius cervicis muscles?
What type of movements do the splenius muscles allow for when acting bilaterally?
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What is the position of the splenius cervicis in relation to the splenius capitis?
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What is the primary action of the splenius capitis when both sides contract?
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Which statement accurately describes the role of the splenius cervicis during unilateral contraction?
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What type of muscle movement do the splenius muscles primarily contribute to?
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Which muscle is located beneath the splenius capitis and affects the cervical region?
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What structure provides innervation to the splenius muscles?
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Study Notes
Superficial Layer Muscles
- Superficial muscles involved in neck movement belong to the spinotransversales group.
Splenius Capitis
- Located at the upper part of the back and neck.
- Bilateral contraction extends the head and neck.
- Unilateral contraction facilitates lateral flexion and rotation of the head to the same side.
Splenius Cervicis
- Positioned beneath the splenius capitis, affecting the cervical region.
- Bilateral extension of the neck.
- Unilateral action allows for lateral flexion and rotation to the same side.
Nervous System Involvement
- Innervation comes from the dorsal primary rami (dpr nerve).
- Segmental roots connect to spinal nerves to enable muscle movement.
Muscle Actions
- Both splenius capitis and splenius cervicis assist in head and neck extension.
- They contribute to lateral flexion and head rotation, all movements occurring ipsilaterally (to the same side).
Summary of Functions
- Actions of splenius muscles include both bilateral and unilateral movements.
- Essential for effective head positioning and mobility.
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Description
Test your knowledge on the superficial layer muscles involved in neck movement, specifically the spinotransversales group including the splenius capitis and splenius cervicis. This quiz will cover their locations, functions, and actions in detail.
