Overview of thorax

Question 1

Where is the True Ribs and where does it attach to?

Answer 1

1-7
attach directly to the sternum

Question 2

Where is the False Ribs and where does it attach to?

Answer 2

8-10
attach to the 7th costal cartilage

Question 3

Where is the Floating Ribs and where does it attach to?

Answer 3

11-12
No anterior attachment

Question 4

*proximal

Answer 4

Towards the trunk/origin

Question 5

*distal

Answer 5

away from the trunk/origin

Question 6

What is the proximal and distal attachment, innervation and action of the Internal Intercostals?

Answer 6

• Inferior border of the ribs
• Superior border of the ribs below
• Intercostal nerve
• Depresses and elevates ribs during forced respiration

Question 7

What is the proximal and distal attachment, innervation and action of the External Intercostals?

Answer 7

• Inferior border of the ribs
• Superior border of the ribs below
• Intercostal nerve
• Elevate ribs during forced inspiration

Question 8

What is the origin, insertion, innervation and action of the Pectoralis minor?

Answer 8

• 3-5 ribs near their costal cartilages
• Medial border and superior surface of the coracoid process of scapula
• Medial pectoral nerves
• depression and protraction of the scapula
  elevates 3-5 ribs
  rotates the scapula downward

Question 9

What is the origin, insertion, innervation and action of the Serratus Anterior?

Answer 9

• Outer surface of the upper 8 ribs
• Anterior aspect of the medial border and inferior angle of scapula
• Long thoracic nerve
• Draws scapula forward (protraction)
  Scapular upward rotation

Question 10

What is the origin, insertion, innervation and action of the Transversus thoracis?

Answer 10

• Lower part of the inner aspect of sternum
• 2-6 costal cartilages
• (muscular collateral branches of) intercostal nerve
• t pulls ribs 2-6 towards the sternum during forced expiration, which results in depression of those ribs