Lab 6 Musculature

Question 1

External intercostals insertion

Answer 1

Superior margin of rib below

Question 2

External intercostals action

Answer 2

Elevates ribs during inspiration

Question 3

External intercostals nerve supply

Answer 3

Intercostal nerves

Question 4

External intercostals blood supply

Answer 4

Ribs 1-2: supreme intercostal and superior thoracic arteries

Ribs 3-12: anterior/posterior intercostal arteries and subcostal arteries

Question 5

Internal intercostals origin

Answer 5

Inferior margin of ribs 1-11 from cartilages to angles

Question 6

Internal intercostals insertion

Answer 6

Superior margin of ribs below

Question 7

Internal intercostals action

Answer 7

Elevates ribs during inspiration

Question 8

Internal intercostals nerve supply

Answer 8

Intercostal nerves

Question 9

Internal intercostals blood supply

Answer 9

Ribs 1-2: supreme intercostal and superior thoracic arteries

Ribs 3-12: anterior/posterior intercostal arteries and subcostal arteries

Question 10

Subcostals origin

Answer 10

Posteriorly on internal surface of lower 6 ribs

Question 11

Subcostals insertion

Answer 11

Internal surface of 2nd or 3rd rib above

Question 12

Subcostals action

Answer 12

Depresses lower ribs

Question 13

Subcostals nerve supply

Answer 13

Intercostal nerves

Question 14

Subcostals blood supply

Answer 14

Posterior intercostal arteries

Question 15

Transversus thoracis origin

Answer 15

Internal surface of sternum and adjacent costal cartilage of ribs 3-6

Question 16

Transversus thoracis insertion

Answer 16

Internal surface of costal cartilage of ribs 2-6

Question 17

Transversus thoracis action

Answer 17

Depresses upper ribs

Question 18

Transversus thoracis nerve supply

Answer 18

Intercostal nerves

Question 19

Transversus thoracis blood supply

Answer 19

Anterior intercostal arteries

Question 20

Diaphragm origin

Answer 20

1. Xiphoid process of sternum
2. Lower 6 costal cartilages
3. First 3 lumbar vertebrae
4. Medial and lateral arcuate ligaments

Question 21

Diaphragm insertion

Answer 21

Central tendon of the diaphragm

Question 22

Diaphragm action

Answer 22

Depresses central tendon to increase vertical dimension of thorax during inspiration

Question 23

Diaphragm nerve supply

Answer 23

Phrenic nerve

Question 24

Diaphragm blood supply

Answer 24

Superior and inferior phrenic arteries

Question 25

Rectus abdominus origin

Answer 25

Pubic symphysis and crest

Question 26

Rectus abdominus insertion

Answer 26

Costal cartilages of ribs 5-7

Xiphoid process

Question 27

Rectus abdominus action

Answer 27

Flexes vertebral column

Compresses abdomen

Question 28

Rectus abdominus nerve supply

Answer 28

Intercostal nerves T7-T12

Question 29

Rectus abdominus blood supply

Answer 29

Superior and inferior epigastric arteries

Question 30

External abdominal oblique origin

Answer 30

Lower 8 ribs

Question 31

External abdominal oblique insertion

Answer 31

1. Abdominal aponeurosis to linea alba
2. Pubis
3. Anterior Iliac crest

Question 32

External abdominal oblique action

Answer 32

Bilateral: flexes vertebral column and compresses abdomen

Unilateral: lateral flexion and contralateral rotation of vertebral column

Question 33

External abdominal oblique nerve supply

Answer 33

Intercostal nerves T7-T12

Iliohypogastric and ilioinguinal nerves

Question 34

External abdominal oblique blood supply

Answer 34

Lower and posterior intercostal, subcostal and deep circumflex iliac arteries

Question 35

External intercostals origin

Answer 35

Inferior margin of ribs 1-11