Ana L1C | Abdominal Wall and Cavity Spring 2024 GI

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Questions and Answers

What is the origin of the Rectus Abdominis muscle?

Outer surface of ribs 5-12

Pubic symphysis and crest (correct)

Anterior iliac crest, thoracolumbar fascia and lateral third of inguinal ligament

Xiphoid process and costal cartilage of ribs 5-7

Which muscle flexes the trunk, compresses internal viscera, and is supplied by the Thoraco-abdominal and subcostal nerves T7-T12?

Rectus Abdominis (correct)

External Oblique

Transversus Abdominis

Internal Oblique

What is the insertion point of the External Oblique muscle?

Xiphoid process and costal cartilage of ribs 5-7

Pubic symphysis and crest

Anterior iliac crest, thoracolumbar fascia, and lateral third of inguinal ligament

Linea Alba (Rectus Sheet), pubic tubercle, and iliac crest (correct)

Which structure describes the components and functions of the Peritoneum?

Skeletal Elements Signup and view all the answers

What is the nerve supply for the Internal Oblique muscle?

Thoraco-abdominal and subcostal nerves T7-T12 Signup and view all the answers

Where does the Rectus Abdominis muscle insert?

Xiphoid process and costal cartilage of ribs 5-7 Signup and view all the answers

Which muscle flexes and rotates the trunk, and compresses and supports internal viscera?

Transversus abdominis Signup and view all the answers

Which nerve supplies the skin, muscles, and parietal peritoneum of the anterolateral abdominal wall?

Subcostal nerve Signup and view all the answers

What is the origin of the quadratus lumborum muscle?

12th rib and transverse processes of lumbar vertebrae Signup and view all the answers

Which artery supplies the superior part of the abdominal wall?

Superior epigastric artery Signup and view all the answers

Which peritoneal fold attaches to the greater curvature of the stomach and the first part of the duodenum?

Greater omentum Signup and view all the answers

Which nerve supplies the anterior surface of the scrotum or labia majora?

Ilio-inguinal nerve Signup and view all the answers

What is the action of the psoas muscle?

Flexes thigh Signup and view all the answers

What structure covers much of the viscera in the abdominal cavity?

Visceral peritoneum Signup and view all the answers

What is a potential space between the parietal and visceral layers of peritoneum called?

The peritoneal cavity Signup and view all the answers

What is the origin of the iliacus muscle?

Iliac crest Signup and view all the answers

What is the nerve supply for the rectus abdominis muscle?

Thoraco-abdominal and subcoastal nerves T7-T12 Signup and view all the answers

Study Notes

Rectus Abdominis

Originates from the pubic symphysis and pubic crest.
Inserts at the xiphoid process and costal cartilages of ribs 5-7.
Flexes the trunk, compresses internal viscera, supplied by Thoraco-abdominal and subcostal nerves (T7-T12).

External Oblique Muscle

Inserts into the linea alba, pubic tubercle, and anterior half of the iliac crest.

Peritoneum

A membranous structure that lines the abdominal cavity, consisting of parietal and visceral layers with various components and functions.

Internal Oblique Muscle

Supplied by the Thoraco-abdominal nerves (T7-T11) and the subcostal nerve (T12), innervating its function.

Quadratus Lumborum Muscle

Originates from the iliolumbar ligament and adjacent iliac crest, contributing to trunk stability and lateral flexion.

Abdominal Wall Blood Supply

Superior part of the abdominal wall is primarily supplied by the superior epigastric artery.

Peritoneal Folds

The greater omentum attaches to the greater curvature of the stomach and the first part of the duodenum.

Sensory Nerve Supply

The ilioinguinal nerve supplies the skin, muscles, and parietal peritoneum of the anterolateral abdominal wall.

Psoas Muscle

Actions include flexion of the trunk, as well as hip flexion and stabilization of the lumbar spine.

Abdominal Cavity Structures

The peritoneal cavity contains a potential space between the parietal and visceral layers of peritoneum.

Iliacus Muscle Origin

Originates from the iliac fossa and iliac crest, contributing to hip flexion alongside the psoas muscle.

Rectus Abdominis Nerve Supply

The rectus abdominis muscle receives its nerve supply from the Thoraco-abdominal nerves (T7-T11) and subcostal nerve (T12).

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Description

Test your knowledge of the surface anatomy, layers, skeletal and muscular elements, and peritoneum of the abdominal wall in this quiz for Spring 2024. Learn to describe the surface anatomy, layers, and functions of the abdominal wall and peritoneum.