Muscles Of Thoracic And Abdominal Wall Flashcards Preview

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Flashcards in Muscles Of Thoracic And Abdominal Wall Deck (28):
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external intercostal origin insertion innervation action

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

1

internal intercostal origin insertion innervation action

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

2

innermost intercostal origin insertion innervation action

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

3

transversus thoracis origin insertion innervation action

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

4

external oblique origin

external surfacesof 5th to 12th ribs

5

external oblique insertion

linea alba, pubic tubercle and anterior half of iliac crest

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external oblique innervation

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

7

external oblique action

compress and support abdominal viscera
flex and rotate trunk

8

internal oblique origin

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

9

internal oblique insertion

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

10

internal oblique innervation

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

11

internal oblique action

compress and support abdominal viscera; flex and rotate trunk

12

transversus abdominis origin

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

13

transversus abdominis insertion

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

14

transversus abdominis innervation

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

15

transversus abdominis action

compresses and supports abdominal viscera

16

rectus abdominis origin

pubic symphysis andpubic crest

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rectus abdominis insertion

xiphoid process and 5th to 7th costal cortilages

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rectus abdominis innervation

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

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rectus abdominis action

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

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orientation of external intercostals

infero anteriorly

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orientation of internal intercostals

inferoposteriorly

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external oblique orientation

fibers pass inferomedially

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internal oblique orientation

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

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transversus abdominis orientation

horizontal

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rectus sheath

formed by aponeurosis of external and internal oblique and transversus abdominis

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linea alba

formed by rectus sheath
xiphoid process to pubic symphysis

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contents of rectus sheath

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)