muscles

Question 1

how many intercostal spaces are there?

Answer 1

11

Question 2

what is each intercostal space filled with?

Answer 2

3 layers of muscles and membranes

Question 3

External Intercostal Muscle?

Answer 3

• extends from inferior edge of the rib above to superior edge of the rib below
• anteriorly the muscles fibres will be replaced by external intercostal membrane
• raise ribs in forced expiration
• prevent undraping during inspiration

Question 4

Internal Intercostal Muscle?

Answer 4

• extends from the lateral edge of costal groove of the rib above to the superior edge of the rib below
• posteriorly muscle fibres will be replaced by internal intercostal membrane
• prevent undraping during inspiration, aids elastic recoil by moving ribs inferiorly in expiration

Question 5

what are the 3 innermost muscles called in the thoracic cage?

Answer 5

• innermost intercostal
• transversus thoracis
• subcostalis

Question 6

subcostalis

Answer 6

• lies on posterior wall
• lowers the internal surface of the ribs down to the inner surface of 2 to 3 ribs below

Question 7

transversus thoracis?

Answer 7

• lies posterior to sternum
• internal aspect of ribs and costal cartilages 3 to 6 to sternum, xiphisternum and costal margin.

Question 8

innermost intercostal?

Answer 8

though to act with internal intercostal muscles
- deep surface is covered with end-thoracic fascia

Question 9

where will you find the neuromuscular bundle?

Answer 9

in the innermost intercostal layer

Question 10

What muscles will u find on the left ventricular wall?

Answer 10

1= trabecula carnae
2= anterior and posterior papillary muscles