Musculature of the Thoracic region

Question 1

External intercostal m

Answer 1

elevates ribs

Question 2

Internal intercostal m

Answer 2

depresses rips

Question 3

innermost intercostal m

Answer 3

elevates ribs

Question 4

Transversus throacis

Answer 4

depresses ribs

Question 5

subcostal muscles

Answer 5

depresses ribs

Question 6

levator costarum

Answer 6

elevates ribs

Question 7

serratus posterior superior

Answer 7

elevates

Question 8

serratus posterior inferior

Answer 8

depresses

Question 9

Intercostals: superior & inferior attachments + innervation

Answer 9

Superior: inferior boarder of ribs

Inferior: superior border of ribs below

innervation intercostal nerve

Question 10

Transverse thoracis: superior & inferior attachments + innervation

Answer 10

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

Innervation: intercostal

weakly depresses ribs

Question 11

Subcostal: superior & inferior attachments + innervation

fig. 1.15 B in atlas

Answer 11

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

Innervation: intercostal nerve

probably act in manner as internal intercostal muscles

Question 12

Levatores costarum

Answer 12

S: Transverse processes of T7-T11
I: subadjacent ribs between tubercle and angle

Innervation: posterior rami C8-T11

Elevates ribs

Question 13

Serratus posterior superior

Answer 13

S: nuchal ligament, spinous processes of C7-T3 vertebrae
I: Superior borders 2nd-4th ribs

Innervation: 2nd-5th intercostal nerves

elevates ribs

Question 14

Serratus posterior inferior

Answer 14

S: spinous processes of T11-L2
I: inferior borders of 8th-12th ribs near their angles

innervation 9th-11th intercostal nerves
subcostal (T12) nerve

depresses ribs