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Anatomy GIT > Anterior Abdominal wall > Flashcards

Anterior Abdominal wall Flashcards

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1
Q

What is the origin of the pyramidalis muscle?

A

Pubic symphysis and pubic crest

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2
Q

Where does the pyramidalis muscle insert?

A

Linea alba

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3
Q

Which arteries supply the pyramidalis muscle?

A

Inferior and superior epigastric arteries

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4
Q

What nerve innervates the pyramidalis muscle?

A

Subcostal nerve (T12)

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5
Q

What is the primary action of the pyramidalis muscle?

A

Tensing the linea alba

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6
Q

What is the shape and location of the pyramidalis muscle?

A

A small triangular muscle, anterior to the rectus abdominis muscle

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7
Q

What is the origin of the rectus abdominis muscle?

A

Crest of pubic

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8
Q

Where does the rectus abdominis muscle insert?

A

Costal cartilages of ribs 5-7 and xiphoid process of sternum

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9
Q

Which artery supplies the rectus abdominis muscle?

A

Inferior epigastric artery

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10
Q

What nerves innervate the rectus abdominis muscle?

A

Thoracoabdominal nerves (T7 to T11) and subcostal nerve (T12)

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11
Q

What is the primary action of the rectus abdominis muscle?

A

Flexion of the lumbar spine

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12
Q

What is the antagonist muscle of the rectus abdominis?

A

Erector spinae

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13
Q

What are the tendinous intersections?

A

Bands of connective tissue that interrupt the rectus abdominis into distinct muscle bellies

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14
Q

What is the anatomical positioning of the rectus muscles?

A

Paired muscles separated by the linea alba

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15
Q

What is the anatomical relationship of the rectus abdominis muscle?

A

Broad and thin superiorly, narrow and thick inferiorly

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16
Q

What forms the rectus sheath?

A

Aponeuroses of the lateral abdominal muscles

17
Q

What is the origin of the external oblique muscle?

A

Ribs 5-12

18
Q

Where does the external oblique muscle insert?

A

Xiphoid process, outer lip of the iliac crest, pubic crest, pubic tubercle, linea alba, inguinal ligament, anterior superior iliac spine (ASIS)

19
Q

Which nerves supply the external oblique muscle?

A

Thoraco-abdominal nerves (T7-11) and subcostal nerve (T12)

20
Q

What actions does the external oblique muscle perform?

A

Ipsilateral side-bending and contralateral rotation

21
Q

What is the blood supply of the external oblique muscle?

A

Lower intercostal arteries and branches of the deep circumflex iliac artery or iliolumbar artery

22
Q

What is the origin of the transversus abdominis muscle?

A

Iliac crest, inguinal ligament, thoracolumbar fascia, and costal cartilages 7-12

23
Q

Where does the transversus abdominis muscle insert?

A

Xiphoid process, linea alba, pubic crest and pecten pubis via conjoint tendon

24
Q

Which arteries supply the transversus abdominis muscle?

A

Subcostal arteries

25
Q

What nerves innervate the transversus abdominis muscle?

A

Thoracoabdominal nerves (T6-T11), subcostal nerve (T12), iliohypogastric nerve (L1), and ilioinguinal nerve (L1)

26
Q

What actions does the transversus abdominis muscle perform?

A

Provides thoracic and pelvic stability by compressing abdominal contents and assists in childbirth

27
Q

What is the anatomical position of the transversus abdominis muscle?

A

Deep to the internal oblique muscle

28
Q

What is the origin of the internal oblique muscle?

A

Inguinal ligament, iliac crest, and lumbodorsal fascia

29
Q

Where does the internal oblique muscle insert?

A

Linea alba, pectineal line of pubis (via conjoint tendon) and ribs 10-12

30
Q

What is the arterial supply of the internal oblique muscle?

A

Subcostal arteries

31
Q

Which nerves supply the internal oblique muscle?

A

Thoracoabdominal nerves (T7-T11), subcostal nerve (T12), iliohypogastric nerve (L1), and ilioinguinal nerve (L1)

32
Q

What are the bilateral and unilateral actions of the internal oblique muscle?

A

Bilateral: compresses abdomen and aids in respiration during exhalation; Unilateral: ipsilateral rotation and side-bending of the trunk

33
Q

What is the region of the anterior abdominal wall?

A

Extends from the xiphoid process and costal margins cranially to the pubic and iliac bones inferiorly and to the mid-axillary lines on either side

Anatomy GIT (4 decks)

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