Podcast
Questions and Answers
Where does the muscle originate from?
Where does the muscle originate from?
At which rib does the muscle insert?
At which rib does the muscle insert?
What is the insertion point of the muscle?
What is the insertion point of the muscle?
Where does the muscle not originate from?
Where does the muscle not originate from?
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Which point marks the insertion site?
Which point marks the insertion site?
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Which nerves pass into the abdominal wall between the 7th and 11th intercostal nerves?
Which nerves pass into the abdominal wall between the 7th and 11th intercostal nerves?
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Where does the anterior ramus of the 12th thoracic nerve travel within the abdomen?
Where does the anterior ramus of the 12th thoracic nerve travel within the abdomen?
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Which nerve runs forward in the abdominal wall as the subcostal nerve?
Which nerve runs forward in the abdominal wall as the subcostal nerve?
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What is the path of the subcostal nerve in relation to the intercostal nerves?
What is the path of the subcostal nerve in relation to the intercostal nerves?
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In what region do the 7th to 11th intercostal nerves enter the abdominal wall?
In what region do the 7th to 11th intercostal nerves enter the abdominal wall?
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Which nerve lies in the abdomen and does not pass into the abdominal wall?
Which nerve lies in the abdomen and does not pass into the abdominal wall?
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Study Notes
The Chest Wall
- Consists of skin, fascia, a skeletal framework, muscles, and a neurovascular bundle, all connected to form a strong, protective, and flexible cage.
Intercostal Spaces
- Comprise of three layers of muscles: external, internal, and innermost.
External Intercostal Muscle
- Forms the most superficial layer of the intercostal muscles.
- Originates from the inferior border of the rib above.
- Inserts at the superior border of the rib below.
- Action: Elevates the ribs during inspiration.
Internal Intercostal Muscle
- Forms the intermediate layer of the intercostal muscles.
- Originates from the inferior border of the lower ribs.
- Inserts at the superior border of the 2nd or 3rd rib below.
- Anteriorly, it is replaced by an aponeurosis, the anterior (external) intercostal membrane.
- Action: Decreases chest volume in expiration.
Innermost Intercostal Muscle
- Is the deepest layer of the intercostal muscles.
- Separated from the internal intercostals by the intercostal neurovascular bundle.
- Found in the most lateral portion of the intercostal spaces.
Innervation and Blood Supply
- Innervated by intercostal nerves (T1-T11).
- Blood supply provided by intercostal vessels.
Intercostal Neurovascular Bundle
- Contains the intercostal nerves, arteries, and veins.
- Runs in the subcostal groove of the corresponding ribs.
Intercostal Nerves
- Derived from the anterior rami of the first 11 thoracic spinal nerves.
- First six intercostal nerves are distributed within their intercostal spaces.
- 7th to 11th intercostal nerves pass into the abdominal wall.
- The anterior ramus of the 12th thoracic nerve lies in the abdomen and runs forward in the abdominal wall as the subcostal nerve.
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Description
Test your knowledge on the anatomy of the thoracic wall, also known as the chest wall, which includes skin, fascia, skeletal framework, muscles, and the neurovascular bundle. This quiz covers key concepts related to intercostal spaces and Department of Human Anatomy topics.
