Intercostal Spaces

Question 1

External Intercostal Muscle (Image)

Answer 1

Near center of picture

Ends anteriorly as anterior intercostal membrane which can be considered to tbe the continuation of the epimysium of the muscle

Question 2

External Intercostal Muscle: Origin and Insertion

Answer 2

Origin: Lower border or rib above

Insertion: Uppoer border of rib below

Question 3

External Intercostal Muscle: Action

Answer 3

Stabilizes the ribs and aids in inspiration

Question 4

Internal Intercostal Muscle

Answer 4

Toward the left of the image by the sternum

Ends posteriorly as posterior intercostal membrane

Question 5

Internal Intercostal Muscle: origin and insertion

Answer 5

Origin: Upper border of rib below

Insertion: from lower border of rib above

Question 6

Internal Intercostal Muscle: Action

Answer 6

Adids in expiration

Question 7

Innermost Intercostal Muscle

Answer 7

Fibers of the internal intercostal muscle separated from it by the intercostal nerve and vessel

Question 8

Intercostal Nerves

Answer 8

Exit the intervertebral foramina and pass to the inferior surface of the next of the corresponding rib which it follows

Question 9

Anterior primary ramus of T1: pathway

Answer 9

Goes over first rib to contribute to brachial plexus

Question 10

first Intercostal nerve

Answer 10

Supplies the intercostal muscles in the first intercostal space

Question 11

Intercostobrachial nerve

Answer 11

Extension of the lateral cutaneous branch

Question 12

Which T nerves are typical?

Answer 12

3-11

Question 13

Posterior Intercostal Arteries

Answer 13

1st and 2nd intercostal spaces receive blood from highest intercostal branch of the costocervical trunk of the subclavian artery

Remaining intercostal spacs receive blood directly from the aotra

Question 14

Anterior Intercostal Arteries

Answer 14

On bottom right of picture

of the 1st 5-6 intercostal spaces receive blood from the internal thoracic branch of the subclavian artery

Question 15

Musculophrenic branch

Answer 15

Bottom center of picture

Remainign interspaces receive blood from this artery

Question 16

Intercostal Veins

Answer 16

Accompany all arteries

Anterior veins drained by vessels corresponding to arteries

Posterior intercostal veins drain into the azygos system of veins