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What is the primary action of the Splenius Capitus muscle?
Which part of the Erector Spinae group is located most laterally?
From where do the Erector Spinae muscles originate?
Which muscle inserts on the post tubercles of the transverse processes of C1-C4?
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What is the innervation for the Splenius muscles?
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Which type of muscle primarily acts on the spine and is usually deeper in location?
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What is the main action of the Serratus posterior superior muscle?
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Which of the following muscles is NOT classified as a posterior extrinsic muscle?
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What is the innervation of the Serratus posterior inferior muscle?
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Which intermediate extrinsic muscle is primarily responsible for respiratory functions?
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What is the role of the superficial anterior extrinsics in relation to the trunk?
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Which of the following structures does NOT typically serve as an origin for the Serratus posterior superior muscle?
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The action of the Serratus posterior inferior muscle primarily involves which movement?
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Which muscle group primarily aids in lateral flexion of the spine?
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What is the role of levator costarum during respiration?
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Which of the following best describes the interspinales muscles?
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What is NOT a function of the anterior muscles of the vertebral column?
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Which of the following is true regarding thoracolumbar fascia?
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Which of the following actions is NOT attributed to the actions of back muscles?
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What is the primary attachment point for the levator costarum muscles?
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Which structure provides biomechanical support during movements of the trunk?
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What is the primary action of the Semispinalis muscle group?
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Which of the following muscles spans 2-4 vertebral segments?
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What is the innervation of the Rotatores muscle?
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What is the origin of the Multifidus muscle?
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Which muscle is responsible for aiding in proprioception?
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Which of the following origins does the Semispinalis muscle NOT have?
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How many vertebral segments does the Rotatores muscle span?
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What stabilizing role does the Multifidus muscle play?
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What is the primary action of the Iliocostalis muscle?
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Which muscle is responsible for laterally flexing the trunk unilaterally?
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Which of the following correctly describes the innervation for the Longissimus muscle?
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Where do the Iliocostalis muscles originate?
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What action does the Spinalis muscle primarily perform bilaterally?
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Which anatomical structure does the Longissimus muscle insert into?
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Which of the following actions does the Longissimus muscle NOT perform?
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What is one of the actions regulated by the Iliocostalis muscle during its eccentric contraction?
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Study Notes
Overview of Trunk Muscles
- Trunk muscles categorized by function and layering: intrinsic (deep, spinal action) and extrinsic (superficial, upper limb or respiratory action).
Posterior Extrinsic Muscles
- Superficial Posterior Extrinsics: Connect vertebral column to upper extremities; names include Trapezius, Latissimus dorsi, Rhomboids, and Levator scapula.
- Intermediate Extrinsics: Connect vertebral column to ribs; include Serratus posterior superior (elevates ribs) and Serratus posterior inferior (depresses ribs).
Intrinsic Muscles
-
Erector Spinae: Arises from the thoracolumbar fascia; three main subdivisions:
- Iliocostalis: Lateral group, subdivided into Lumborum, Thoracis, Cervicis.
- Longissimus: Middle group, subdivided into Thoracis, Cervicis, Capitus.
- Spinalis: Medial group, subdivided into Thoracis, Cervicis, Capitus.
Deep Intrinsics
-
Transversospinal Muscles:
- Semispinalis: Spans 4-6 vertebral segments; includes thoracis, cervicis, capitus variations.
- Multifidus: Spans 2-4 segments; stabilizes the spine.
- Rotatores: Spans 1-2 segments; aids in stabilization and proprioception.
Actions of Back Muscles
- Muscles perform various actions including extension, contralateral rotation, and lateral flexion.
- Eccentric actions are critical in functional activities, controlling movement dynamics.
Thoracic Cage and Intercostal Muscles
- Intercostal Muscles: External and internal groups contribute to respiration and trunk stability.
Anterior Muscles of the Vertebral Column
- Prevertebral muscles discussed later in relation to the neck and abdominal wall.
Thoracolumbar Fascia
- Composed of multiple connective tissue layers:
- Superficial Layer: Contains subcutaneous tissue and adipose tissue; connects to deep fascia.
- Deep Layer: Represents the thoracolumbar fascia proper, critical for supporting the lumbar region.
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Description
Test your knowledge on the anatomy of the Splenius Capitus muscle, including its origin, insertion, action, and innervation. This quiz will help you understand the muscle's role in lateral flexion and ipsilateral rotation. Perfect for anatomy students!
