anterior abdominal wall Flashcards

1
Q

What is the midline dent on surface anatomy called? Caused by?

A

Linea alba. Caused by deep connective tissue

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2
Q

What is the surface anatomy midsagittal line called (parallel to linea alba)?

A

Linea semilunaris; separates obliques and ab muscles

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3
Q

What is and where is the rectus abdominis?

A

Tendinous intersections causing bulging in abdomen to make a 6 pack

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4
Q

What is ASIS?

What is AIIS?

A

Anterior superior iliac spine

Anterior inferior iliac spine

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5
Q

L1 is what plane

A

transpuloric

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6
Q

L2 is what plane? what marker?

A

subcostal plane for gallbladder

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7
Q

L4 is what plane? marking for what?

A

transumbilical or supracristal aka belly button; marks where anterior inferior iliac spine

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8
Q

S1 or S2 is what plane? marker for what organ?

A

transtubercular plane, appendix

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9
Q

Name the layers of abdominal wall from superficial to deepest

A

Skin, campers fascia (fat), scarpa fascia (thin membranous), external oblique, internal oblique, transverse abdominis, transversalis facsia, extraperitoneal fat (various levels of fat), parietal peritoneum

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10
Q

Where is interspinous plane?

A

Between ASIS and S2/S3

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11
Q

What is the inferior border of abdomen?

A

inguinal ligament

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12
Q

What is the external oblique aponeurosis?

A

Connects external oblique muscle to linea alba

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13
Q

External oblique muscles fibers follow the same direction as what other muscles?

A

External intercostal, all externals are directed inferiorly and medially

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14
Q

What direction do internal oblique and internal intercostal muscle fibers go?

A

Superiorly and medially

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15
Q

What is unique about the internal oblique apeurosis?

A

It splits into anterior and posterior sheaths that encircle the rectus abdominus

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16
Q

What muscle do only 70-80% of people have? What does it do?

A

Pyramidalis. Important for tensing the linea alba