Intercostal structures

Question 1

What makes up the thoracic wall?

Answer 1

Skin
Superficial fascia (anterior and lateral cutaneous branches of intercostal nerves)
Deep fascia
Muscle

Question 2

What are the three instrinsic muscles of the thorax?

Answer 2

Pectoralis major
Pectoralis minor
Serratus anterior

Question 3

What is the intercostal space?

Answer 3

It is the space between two ribs

Question 4

What does each space contain?

Answer 4

Intercostal muscles
Intercostal neurovascular bundle
Lymphatics

Question 5

What is the most superficial intercostal muscle of the thorax?

Answer 5

External intercostal muscle

Question 6

What is the origin of the external intercostal muscle?`

Answer 6

From the lower border of the ribs above

Question 7

What is the insertion of the external intercostal muscles?

Answer 7

Upper border of rib below

Question 8

Where is the external intercostal muscle located?

Answer 8

Extends from the rib tubercle behind the costo-chondral junction in front

Question 9

What is the external intercostal muscle replaced with anteriorly?

Answer 9

External intercostal membrane

Question 10

What layer is the internal intercostal muscle?

Answer 10

Intermediate layer

Question 11

What direction does the fibres of the internal intercostal muscle run?

Answer 11

Fibres directed downward and backward

Question 12

Where is the internal intercostal muscle located?

Answer 12

Extends from the sternum in front to the angle of the rib behind

Question 13

What is the internal intercostal muscle replaced by posteriorly?

Answer 13

Internal intercostal membrane

Question 14

What are the three intrinsic muscles?

Answer 14

External intercostal
Internal intercostal
Innermost intercostal

Question 15

What does the intercostal nerves supply?

Answer 15

Muscles of the ribs, anterolateral thorax and abdominal wall

Question 16

What are the intercostal nerves?

Answer 16

Anterior rami of spinal nerves T1-T11 because they travel in the intercostal spaces between adjacent ribs

Question 17

What is the nerve T12 called and why?

Answer 17

Subcostal nerve because it arises below the ribs

Question 18

Do the intercostal nerves form plexuses?

Answer 18

No with the exception of T1

Question 19

What does T1 intercostal nerve do?

Answer 19

Brachial plexus

Question 20

What does T2 intercostal nerve do?

Answer 20

Innervates the intercostal muscles of the second intercostal space and is sensory for the axilla and medial surface of the arm

Question 21

What does T3-T6 intercostal nerve do?

Answer 21

Innervate the intercostal muscles and are sensory for the anterior chest wall

Question 22

What does T7-T12 intercostal nevre innervate?

Answer 22

the intercostal muscles, the abdominal muscles and the overlying skin.

Question 23

What is present in the intercostal space?

Answer 23

Intercostal nerve
Intercostal artery
Intercostal vein

Question 24

What are the arteries of the thoracic wall?

Answer 24

Thoracic aorta
Subclavian artery
Axillary artery

Question 25

What are the arteries of the thoracic wall?

Answer 25

Thoracic aorta Subclavian artery Axillary artery

Question 26

What does the thoracic aorta divide into?

Answer 26

Posterior intercostal and subcostal arteries

Question 27

What does the subclavian arteries divide into?

Answer 27

Internal thoracic and supreme intercostal arteries

Question 28

What does the axillary and superior artery divide into?

Answer 28

Superior and lateral thoracic arteries

Question 29

What are the two intercostal arteries?

Answer 29

Anterior intercostal arteries | Posterior intercostal arteries

Question 30

Where do the upper 6 pairs of arteries arise from?

Answer 30

The internal thoracic artery

Question 31

Where do the 7th, 8th, 9th pairs of arteries arise from?

Answer 31

Musculophrenic artery

Question 32

What is the origin of the internal thoracic artery?

Answer 32

First part of the subcalvian artery

Question 33

Where does the internal thoracic artery terminate?

Answer 33

Opposite the sixth intercostal space by dividing into superior epigastric and musculophrenic arteries

Question 34

Where does the venous drainage occur?

Answer 34

Parallel to the pattern of arterial supply

Question 35

What is the venous drainage made up of?

Answer 35

Intercostal veins Azgous vein or into internal thoracic veins Brachiocephalic veins

Question 36

What forms the internal thoracic vein?

Answer 36

Formed by the union of the two venae comitantes of the internal thoracic artery behind the third costal cartilage

Question 37

What path does the internal thoracic vein take?

Answer 37

It ascends close to the artery to terminate in the corresponding innominate vein