Thoracic Wall

Question 1

Serratus Posterior Superior

Answer 1

Attachments:

Superior/Proximal: Nuchal ligaments, Spinous process C3-T7
Inferior/Distal: Superior borders 2nd-4th ribs

Action:

Proprioception (elevate ribs)

Question 2

Serratus Posterior Inferior

Answer 2

Attachments:

Superior/Proximal: Spinous Process T11-L2
Inferior/Distal: Inferior Borders 8th-12th Ribs

Action/s:

Proprioception (Depress Ribs)

Question 3

Levator Costarum

Answer 3

Attachments:

Superior/Proximal: Transverse Processes T7-T11
Inferior/Distal: Adjacent Ribs

Action/s:

Elevate Ribs

Question 4

External Intercostal

Answer 4

Attachments:

Superior/Proximal: Inferior Border of Ribs
Inferior/Distal: Superior Border of ribs Below

Action:

Elevate Ribs (Forced Inspiration) & maintain intercostal space rigidity

Question 5

Internal Intercostal

Innermost Intercostal

Answer 5

Attachments:

Superior/Proximal: Inferior Border of Ribs
Inferior/Distal: Superior Border of Ribs below

Action:

During Forced Respiration
Interosseous Part - Depress Ribs
Interchondral Part - Elevate Ribs
Maintain intercostal space rigidity

Question 6

Subcostal

Answer 6

Attachments:

Superior/Proximal: Lower Ribs (Inferior Surfaces)
Inferior/Distal: Superior Borders of ribs below

Action:

During Forced Respiration
Interosseous Part - Depress Ribs
Interchondral Part - Elevate Ribs
During forced respiration

Question 7

Transversus Thoracis

Answer 7

Attachments:

Superior/Proximal: Posterior, Lower Sternum
Inferior/Distal: Internal surface of Costal Cartilages

Action:
Mostly proprioception
Weakly Depress Ribs