True Muscles Of Thoracic Wall

Question 0

Superior and inferior attachments of Serratus Posterior Superior

Answer 0

Superior attachment: Nuchal ligament, spinous processes of C7 to T3 vertebrae

Inferior attachment: superior borders of 2nd to 4th ribs

Question 1

Name the true muscles of the thoracic wall (8)

Answer 1

Serratus posterior superior, 
Serratus posterior inferior,
External intercostal,
 Internal intercostal,
Innermost intercostal,
Sub costal,
Levator costarum,
Transverse thoracis

Question 2

Innervation of Serratus posterior superior ?

Answer 2

intercostal nerves

Question 3

What is the main action for Serratus posterior superior?

Answer 3

Proprioception and to elevate the ribs

Question 4

Superior and inferior attachments of Serratus posterior inferior

Answer 4

S: spinous processes of T11 - L2 (lower thoracic/upper lumbar)
I: inferior borders of 8th to 12th ribs near angles

Question 5

Innervation of Serratus posterior inferior?

Answer 5

Thoracic spinal nerves thoracic spinal nerves

Question 6

Action of Serratus posterior inferior ?

Answer 6

Proprioception and depress ribs

Question 7

Superior attachments and inferior attachments of intercostals and Innervations

Answer 7

S: Inferior border of the ribs
I: superior border of ribs below
N: intercostal nerves

Question 8

Actions of external internal and innermost intercostals

Answer 8

External : elevate ribs during forced inspiration.

Internal and innermost - Interroseous part : depresses ribs - during active (forced resp.)

Internal and innermost- Interchondral part : elevates ribs during active resp.

Question 9

Superior and inferior attachments of the subcostals

Answer 9

S: internal surface of lower ribs near angles
I: superior borders of 2nd or 3rd ribs below

Question 10

Innervation for subcostals

Answer 10

Intercostal nerve

Question 11

Action if subcostals

Answer 11

Ribs movements

Question 12

Levator costarum superior and inferior attachments

Answer 12

S: transverse processes of C7- T11.
I: Subjacent ribs between tubercle and angle.

Question 13

Innervation of levator costarum

Answer 13

Posterior primary rami of C8 - T11 nerves

Posterior rami of spinal nerves

Question 14

Action of levator costarum

Answer 14

Elevated the ribs

Question 15

Superior and inferior attachments of the transverse thoracis

Answer 15

S: posterior surface of lower sternum
I: internal surface of costal cartilages 2-6

Question 16

Innervation of transverse thoracis and action

Answer 16

N: intercostal nerve

Weakly depresses the ribs and maybe proprioception

Question 17

What 3 muscles of true thoracic wall are innervated by the intercostal nerve ?

Answer 17

Intercostals, subcostals and transverse thoracis.