Level 3 Muscles Overview - Breathing Actions Flashcards Preview

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Flashcards in Level 3 Muscles Overview - Breathing Actions Deck (3)
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1

Internal Intercostals

Location:
In between each of the ribs

Action:
- draws the ribs downwards, decreasing the volume of the thoracic cavity when breathing out (expiration)

Origin:
Superior border of each rib

Insertion:
Inferior border of the rib above

2

External Intercostals

Location:
In between each of the ribs

Action:
- lifts the ribs upwards, increasing the volume of the thoracic cavity when breathing in (inspiration)

Origin:
Superior border of each rib

Insertion:
Inferior border of the rib above

3

Diaphragm

Location:
Internal muscle at the bottom of the ribcage, separating the thoracic cavity from the abdominal cavity

Action:
- draws the central tendon down, increasing the volume of the thoracic cavity during inspiration

Origin:
Inner surface of the lower ribs and L1, L2 and L3

Insertion:
Central tendon

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