Muscles of Thorax

Question 1

External intercostal - Attachments

Answer 1

FROM
*rib to rib oriented from superior-lateral

TO
*inferior-medial

[down and in]

Question 2

External intercostal - Actions

Answer 2

elevation of ribs

Question 3

External intercostal - Innervation

Answer 3

intercostal nerve (segmental)

Question 4

Internal & innermost intercostal - Attachments

Answer 4

FROM
*rib to rib oriented superior-medial

TO
*inferior-lateral

[down and out]

Question 5

Internal & innermost intercostal - Actions

Answer 5

depression of ribs

Question 6

Internal & innermost intercostal - Innervation

Answer 6

intercostal nerve (segmental)

Question 7

Transversus thoracis - Attachments

Answer 7

FROM
*from posterior sternum

TO
*costal cartilages

Question 8

Transversus thoracis - Actions

Answer 8

depress ribs

Question 9

Transversus thoracis - Innervation

Answer 9

intercostal nerves (segmental)

Question 10

Diaphragm - Attachments

Answer 10

FROM
*xiphoid process
*inner surface of the lower ribs
*costal cartilages
*lumbar vertebrae via the crura

TO
*central tendon

Question 11

Diaphragm - Actions

Answer 11

inspiration (negative thoracic pressure by inferior displacement)

Question 12

Diaphragm - Innervation

Answer 12

phrenic nerve
C3-5