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Questions and Answers
Which muscles are considered intrinsic muscles of the thoracic wall?
What is the function of the external intercostal muscles?
What is the anatomic space between two ribs called?
Which muscles help in closing the intercostal spaces?
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What travels between the internal and innermost layers of the intercostal spaces?
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Which muscle is responsible for elevating the scapula and rotating it during abduction of the arm?
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Which muscle originates from the spinous processes of T6-T12, iliac crest, thoracolumbar fascia, and the inferior three ribs?
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Which muscle forms a trapezoid shape and is the most superficial of all the back muscles?
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Which muscle is responsible for pulling the scapula inferiorly?
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Which muscle originates from the skull, ligamentum nuchae, and the spinous processes of C7-T12?
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Study Notes
Intrinsic Muscles of the Thoracic Wall
- Includes the internal intercostal muscles, innermost intercostal muscles, and subcostal muscles.
Function of External Intercostal Muscles
- Elevate the ribs during inhalation, increasing thoracic cavity volume and aiding in breathing.
Anatomic Space Between Two Ribs
- Known as the intercostal space.
Closure of Intercostal Spaces
- The internal intercostal muscles help close the intercostal spaces during expiration.
Structures Between Internal and Innermost Intercostal Layers
- Intercostal veins, arteries, and nerves travel in this space.
Muscle Responsible for Scapula Elevation and Rotation
- The trapezius muscle elevates and rotates the scapula, especially during arm abduction.
Muscle Originating from T6-T12 and Other Areas
- The latissimus dorsi originates from the spinous processes of T6-T12, iliac crest, thoracolumbar fascia, and inferior three ribs.
Superficial Trapezoidal-Shaped Back Muscle
- The trapezius muscle is the most superficial back muscle, forming a trapezoid shape.
Muscle Pulling the Scapula Inferiorly
- The rhomboid major muscle is primarily responsible for pulling the scapula inferiorly.
Muscle Originating from Skull and Spinal Processes
- The trapezius also originates from the skull, ligamentum nuchae, and the spinous processes of C7-T12.
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Description
Test your knowledge of the muscles that support the thoracic wall, including the intrinsic muscles such as the external and internal intercostal muscles.
