Muscles Of Thoracic And Abdominal Wall

Question 0

internal intercostal origin insertion innervation action

Answer 0

originates on inferior border of ribs
inserts on superior border of ribs below
innervated by intercostal nerve
during forced respiration: interosseus part depresses ribs; interchondral part elevates ribs

Question 1

external intercostal origin insertion innervation action

Answer 1

originates on inferior border of ribs
inserts on superior border of ribs below
innervated by intercostal nerve
during forced inspiration, elevates ribs

Question 2

innermost intercostal origin insertion innervation action

Answer 2

originates on inferior border of ribs
inserts on superior border of ribs below
innervated by intercostal nerve
during forced respiration: interosseus part depresses ribs; interchondral part elevates ribs

Question 3

transversus thoracis origin insertion innervation action

Answer 3

originates on posterior surface of lower sternum
inserts on internal surface of costal cartilages 2-6
innervated by intercostal nerve
weakly depresses ribs

Question 4

external oblique origin

Answer 4

external surfacesof 5th to 12th ribs

Question 5

external oblique insertion

Answer 5

linea alba, pubic tubercle and anterior half of iliac crest

Question 6

external oblique innervation

Answer 6

thoraco-abdominal nerves (anterior rami of T7-T11) and subcostal nerve

Question 7

external oblique action

Answer 7

compress and support abdominal viscera

flex and rotate trunk

Question 8

internal oblique origin

Answer 8

thoracolumbar fascai
anterior two thirds of iliac crest
and connective tissue deep to inguinal ligament

Question 9

internal oblique insertion

Answer 9

inferior borders of 10th-12th ribs
linea alba
and pubis via conjoint tendon

Question 10

internal oblique innervation

Answer 10

thoraco-abdominal nerves (anterior rami of T7-T11), subcostal and first lumbar nerve

Question 11

internal oblique action

Answer 11

compress and support abdominal viscera; flex and rotate trunk

Question 12

transversus abdominis origin

Answer 12

internal surfaces of 7th-12th costal cartilages, thoracolumbra fascia, iliac crest and connective tissue deep to inguinal ligament

Question 13

transversus abdominis insertion

Answer 13

linea alba with aponeurosis of internal oblique, pubic crest and pubis via conjoint tendon

Question 14

transversus abdominis innervation

Answer 14

thoraco-abdominal nerves (anterior rami of T7-T11), subcostal and first lumbar nerve

Question 15

transversus abdominis action

Answer 15

compresses and supports abdominal viscera

Question 16

rectus abdominis origin

Answer 16

pubic symphysis andpubic crest

Question 17

rectus abdominis insertion

Answer 17

xiphoid process and 5th to 7th costal cortilages

Question 18

rectus abdominis innervation

Answer 18

thoraco-abdominal and subcostal nerves (anterior rami of T7-T12 spinal nerves)

Question 19

rectus abdominis action

Answer 19

flexes trunk (lumbar vertebrae) and compresses abdominal viscera
stabilizes and controls tilt of pelvis (antilordosis)

Question 20

orientation of external intercostals

Answer 20

infero anteriorly

Question 21

orientation of internal intercostals

Answer 21

inferoposteriorly

Question 22

external oblique orientation

Answer 22

fibers pass inferomedially

Question 23

internal oblique orientation

Answer 23

upper fibers are perpendicular and lower fibers are parallel to external oblique

Question 24

transversus abdominis orientation

Answer 24

horizontal

Question 25

rectus sheath

Answer 25

formed by aponeurosis of external and internal oblique and transversus abdominis

Question 26

linea alba

Answer 26

formed by rectus sheath

xiphoid process to pubic symphysis

Question 27

contents of rectus sheath

Answer 27

rectus abdominis and pyramidalis muscles
anastomosing superior and inferior epigastric arteries and veins
lymphatic vessels and thoraco-abdominal and subcostal nerves (distal portions of anterior rami of spinal nerves T7-T12)