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Questions and Answers
Which muscle is responsible for head rotation to the same side?
What action does the splenius cervicis perform unilaterally?
What is the collective name for the splenius capitis and splenius cervicis muscles?
Which nerve is associated with the superficial layer muscles of the neck?
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What is the bilateral action of the splenius capitis and cervicis?
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What is the primary function of the splenius muscles during bilateral action?
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Which statement correctly describes the unilateral action of the splenius cervicis?
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Which structure is involved with the innervation of the splenius muscles?
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What characterizes the actions of the splenius capitis and cervicis collectively?
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Which term describes the position of the splenius muscles when considering their effects on head movements?
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What is the primary role of the splenius muscles during unilateral action?
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Which best describes the innervation of the splenius capitis and splenius cervicis muscles?
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Which action is NOT performed by the bilateral contraction of the splenius muscles?
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What is a common characteristic of the spinotransversales muscle group?
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Which statement is true regarding the ipsilateral action of the splenius capitis and cervicis?
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Study Notes
Superficial Layer Muscles
- The superficial muscles primarily involved in neck movement belong to the spinotransversales group.
Splenius Capitis
- Positioned at the upper part of the back and neck.
- Functions to extend the head and neck when both sides contract (bilateral action).
- Facilitates lateral flexion and rotation of the head to the same side when one side contracts (unilateral action).
Splenius Cervicis
- Located beneath the splenius capitis primarily affecting the cervical region.
- Plays a role in extending the neck bilaterally and allows for lateral flexion and rotation to the same side unilaterally.
Nervous System Involvement
- Dorsal primary rami (dpr nerve) supply innervation to these muscles.
- Segmental roots connect to spinal nerves and facilitate muscle movement.
Muscle Actions
- Both splenius capitis and splenius cervicis support head and neck extension.
- They contribute to lateral flexion and head rotation, all occurring ipsilaterally (to the same side).
Summary of Functions
- The actions of the splenius muscles involve both bilateral and unilateral movements, crucial for head positioning and mobility.
Superficial Layer Muscles
- The superficial muscles primarily involved in neck movement belong to the spinotransversales group.
Splenius Capitis
- Positioned at the upper part of the back and neck.
- Functions to extend the head and neck when both sides contract (bilateral action).
- Facilitates lateral flexion and rotation of the head to the same side when one side contracts (unilateral action).
Splenius Cervicis
- Located beneath the splenius capitis primarily affecting the cervical region.
- Plays a role in extending the neck bilaterally and allows for lateral flexion and rotation to the same side unilaterally.
Nervous System Involvement
- Dorsal primary rami (dpr nerve) supply innervation to these muscles.
- Segmental roots connect to spinal nerves and facilitate muscle movement.
Muscle Actions
- Both splenius capitis and splenius cervicis support head and neck extension.
- They contribute to lateral flexion and head rotation, all occurring ipsilaterally (to the same side).
Summary of Functions
- The actions of the splenius muscles involve both bilateral and unilateral movements, crucial for head positioning and mobility.
Superficial Layer Muscles
- The superficial muscles primarily involved in neck movement belong to the spinotransversales group.
Splenius Capitis
- Positioned at the upper part of the back and neck.
- Functions to extend the head and neck when both sides contract (bilateral action).
- Facilitates lateral flexion and rotation of the head to the same side when one side contracts (unilateral action).
Splenius Cervicis
- Located beneath the splenius capitis primarily affecting the cervical region.
- Plays a role in extending the neck bilaterally and allows for lateral flexion and rotation to the same side unilaterally.
Nervous System Involvement
- Dorsal primary rami (dpr nerve) supply innervation to these muscles.
- Segmental roots connect to spinal nerves and facilitate muscle movement.
Muscle Actions
- Both splenius capitis and splenius cervicis support head and neck extension.
- They contribute to lateral flexion and head rotation, all occurring ipsilaterally (to the same side).
Summary of Functions
- The actions of the splenius muscles involve both bilateral and unilateral movements, crucial for head positioning and mobility.
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Description
Test your knowledge on the superficial layer muscles, specifically the splenius capitis and splenius cervicis. This quiz covers their actions, innervation, and the bilateral and unilateral movements of the head and neck. Understand the importance of these muscles in facilitating movement and stability.
