Questions and Answers
Which of the following muscles is involved in head rotation to the same side?
What action do the splenius capitis and splenius cervicis muscles perform bilaterally?
Which nerves supply the splenius muscles?
What is the primary action of the splenius cervicis when acting unilaterally?
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What term describes the type of muscle activity of the splenius muscles when they act on the same side?
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What is the effect of unilateral contraction of the splenius muscles?
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Which of the following components is primarily involved in the innervation of the splenius capitis and splenius cervicis muscles?
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What is the main action attributed to the splenius capitis muscle when it contracts bilaterally?
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In which anatomical region do the spinotransversales muscles, including the splenius capitis and splenius cervicis, primarily exert their function?
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Which muscle action would NOT occur through the unilateral contraction of the splenius muscles?
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What specific action occurs when the splenius muscles contract unilaterally?
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Which of the following describes the innervation of the splenius capitis and splenius cervicis muscles?
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In which context would you observe ipsilateral action of the splenius muscles?
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Which term best describes the group of muscles that includes splenius capitis and splenius cervicis?
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What effect does bilateral contraction of the splenius muscles have on the head and neck?
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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 of the neck, specifically the splenius capitis and splenius cervicis. This quiz explores their functions, actions, and nervous system involvement, enhancing your understanding of head and neck movement.
