Podcast
Questions and Answers
Which muscle group is primarily responsible for extension and hyperextension of the head, neck, and trunk?
Which muscle group is primarily responsible for extension and hyperextension of the head, neck, and trunk?
- Transversospinales (correct)
- Levator Costarum
- Interspinalis
- Intertransversarii
Which of the following muscles is innervated by both dorsal primary rami (DPR) and ventral primary rami (VPR) of spinal nerves?
Which of the following muscles is innervated by both dorsal primary rami (DPR) and ventral primary rami (VPR) of spinal nerves?
- Multifidus
- Semispinalis
- Interspinalis
- Intertransversarii (correct)
Which muscle listed is NOT located in the deepest layer of the deep posterior muscles of the back?
Which muscle listed is NOT located in the deepest layer of the deep posterior muscles of the back?
- Intertransversarii
- Levator Costarum
- Multifidus (correct)
- Interspinalis
If a patient has lost the ability to extend their trunk, which muscle group is MOST likely affected?
If a patient has lost the ability to extend their trunk, which muscle group is MOST likely affected?
Which muscle is innervated by the subcostal nerve, and also contributes to movements of the trunk?
Which muscle is innervated by the subcostal nerve, and also contributes to movements of the trunk?
A patient reports pain along their spine and difficulty rotating their trunk. Which of the following muscle groups is MOST likely involved?
A patient reports pain along their spine and difficulty rotating their trunk. Which of the following muscle groups is MOST likely involved?
If a patient has damage to the dorsal primary rami (DPR) of spinal nerves in the lumbar region, which muscle would be MOST affected?
If a patient has damage to the dorsal primary rami (DPR) of spinal nerves in the lumbar region, which muscle would be MOST affected?
Why are the interspinalis and intertransversarii muscles categorized as being in the 'deepest' layer?
Why are the interspinalis and intertransversarii muscles categorized as being in the 'deepest' layer?
Which of the following muscle actions would be MOST affected by damage to the levator costarum?
Which of the following muscle actions would be MOST affected by damage to the levator costarum?
How do the segmental nerve roots contribute to the function of the deep back muscles?
How do the segmental nerve roots contribute to the function of the deep back muscles?
The multifidus muscle is part of which muscle group?
The multifidus muscle is part of which muscle group?
Which of the following does NOT receive innervation from the dorsal primary ramus (DPR)?
Which of the following does NOT receive innervation from the dorsal primary ramus (DPR)?
Which muscle performs lateral flexion of the trunk?
Which muscle performs lateral flexion of the trunk?
A patient presents with pain upon inspiration. Which muscle is potentially the source of the pain?
A patient presents with pain upon inspiration. Which muscle is potentially the source of the pain?
The semispinalis muscle contributes primarily to which movement(s)?
The semispinalis muscle contributes primarily to which movement(s)?
Which of the following muscles is responsible for stabilizing adjacent vertebrae?
Which of the following muscles is responsible for stabilizing adjacent vertebrae?
Which of the following statements is MOST accurate regarding the innervation of deep back muscles?
Which of the following statements is MOST accurate regarding the innervation of deep back muscles?
What is the functional impact of the segmental arrangement of nerve supply to the deep back muscles?
What is the functional impact of the segmental arrangement of nerve supply to the deep back muscles?
Which of the following muscles would be MOST important for maintaining an upright posture against resistance?
Which of the following muscles would be MOST important for maintaining an upright posture against resistance?
A person is experiencing increased lordosis (exaggerated lumbar curve). Dysfunction in which muscle could contribute to this condition?
A person is experiencing increased lordosis (exaggerated lumbar curve). Dysfunction in which muscle could contribute to this condition?
Flashcards
Deep Layer Muscles
Deep Layer Muscles
Muscles located in the deep layer of the back, including semispinalis, multifidus, and rotatores.
DPR (Dorsal Primary Rami)
DPR (Dorsal Primary Rami)
Dorsal primary rami; innervates the deep back muscles segmentally from spinal nerve roots.
Deepest Layer Muscles
Deepest Layer Muscles
A group of muscles including interspinalis, intertransversarii, and levator costarum, located in the deepest layer of the back.
Common Actions
Common Actions
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Quadratus Lumborum
Quadratus Lumborum
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Interspinalis
Interspinalis
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Intertransversarii
Intertransversarii
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Study Notes
- Deep layer muscles include semispinalis, multifidus, rotatores, interspinalis, intertransversarii, levator costarum and quadratus lumborum.
- Semispinalis, multifidus, and rotatores belong to the transversospinales group.
- The common actions of these muscles are head, neck, and trunk extension, as well as hyperextension.
- Semispinalis, multifidus, rotatores, interspinalis, and levator costarum are innervated by the dorsal primary rami (DPR) of segmental nerves and roots.
- Intertransversarii are innervated by both dorsal primary rami (DPR) and ventral primary rami (VPR) of segmental nerves and roots.
- Quadratus lumborum is innervated by the subcostal nerve (T12).
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