Podcast
Questions and Answers
Which muscle is the most internal of the flat muscles of the abdomen?
Which muscle is the most internal of the flat muscles of the abdomen?
- Obliquus externus abdominis
- Obliquus internus abdominis
- Rectus abdominis muscle
- Transversus abdominis muscle (correct)
What is the orientation of the Obliquus internus abdominis muscle?
What is the orientation of the Obliquus internus abdominis muscle?
- Lateral 1/3 of Inguinal ligament (correct)
- Pubic tubercle
- Posterior half of iliac crest
- External surfaces of lower 8 ribs
Which structure lies beneath the Transversus abdominis muscle?
Which structure lies beneath the Transversus abdominis muscle?
- Internal abdominal oblique muscle (correct)
- Rectus abdominis muscle
- Campers Fascia
- Obliquus externus abdominis
What is the nerve supply for the Rectus abdominis muscle?
What is the nerve supply for the Rectus abdominis muscle?
Which fascia lies deep to Scarpa's Fascia?
Which fascia lies deep to Scarpa's Fascia?
Which structure is located superior to the arcuate line in the anterior part of the abdominal wall?
Which structure is located superior to the arcuate line in the anterior part of the abdominal wall?
What directly meets the posterior aspect of the rectus abdominis muscles below the arcuate line?
What directly meets the posterior aspect of the rectus abdominis muscles below the arcuate line?
Which layer is missing in the posterior lamina (sheet) of the rectus sheath below the arcuate line?
Which layer is missing in the posterior lamina (sheet) of the rectus sheath below the arcuate line?
Which abdominal muscle is part of the deep layers of the anterolateral abdominal wall?
Which abdominal muscle is part of the deep layers of the anterolateral abdominal wall?
Which layer serves as a membranous layer in the anterolateral abdominal wall?
Which layer serves as a membranous layer in the anterolateral abdominal wall?
Which muscle is a long flat muscle that extends along the whole length of the front of the abdomen?
Which muscle is a long flat muscle that extends along the whole length of the front of the abdomen?
Which layer of the abdominal wall is more prominent in the lower aspect of the abdomen, inferior to the umbilicus?
Which layer of the abdominal wall is more prominent in the lower aspect of the abdomen, inferior to the umbilicus?
What is the composition of the rectus sheath formed by?
What is the composition of the rectus sheath formed by?
Where is Scarpa's Fascia located in relation to the rectus sheath?
Where is Scarpa's Fascia located in relation to the rectus sheath?
At what level does the Arcuate line reside in relation to the umbilicus and pubic symphysis?
At what level does the Arcuate line reside in relation to the umbilicus and pubic symphysis?
Flashcards
Abdominal Wall Layers
Abdominal Wall Layers
The abdominal wall is composed of multiple layers, including skin, fatty and membranous layers, abdominal muscles, and peritoneum.
Rectus Sheath
Rectus Sheath
A sheath covering the rectus abdominis muscle, formed by the converging aponeuroses of abdominal muscles.
Camper's Fascia
Camper's Fascia
A fatty layer of connective tissue deep to the skin in the abdomen.
Scarpa's Fascia
Scarpa's Fascia
Signup and view all the flashcards
External Oblique Muscle
External Oblique Muscle
Signup and view all the flashcards
Internal Oblique Muscle
Internal Oblique Muscle
Signup and view all the flashcards
Transversus Abdominis Muscle
Transversus Abdominis Muscle
Signup and view all the flashcards
Transversalis Fascia
Transversalis Fascia
Signup and view all the flashcards
Extraperitoneal Fat
Extraperitoneal Fat
Signup and view all the flashcards
Parietal Peritoneum
Parietal Peritoneum
Signup and view all the flashcards
Linea Alba
Linea Alba
Signup and view all the flashcards
Arcuate Line
Arcuate Line
Signup and view all the flashcards
Rectus Abdominis Muscle
Rectus Abdominis Muscle
Signup and view all the flashcards
External Oblique Muscle Origin
External Oblique Muscle Origin
Signup and view all the flashcards
External Oblique Muscle Insertion
External Oblique Muscle Insertion
Signup and view all the flashcards
Study Notes
Abdominal Wall Layers
- The abdominal wall consists of 9-12 layers, depending on the location with respect to the arcuate line.
- The layers of the abdominal wall are:
- Skin
- Camper's fascia (fatty layer)
- Scarpa's fascia (membranous layer)
- External oblique muscle
- Internal oblique muscle
- Transversus abdominis muscle
- Transversalis fascia
- Extraperitoneal fat
- Parietal peritoneum
Rectus Sheath
- The rectus sheath is a protective covering over the rectus abdominis muscle.
- It is composed of the aponeurosis of the three flat muscles (external oblique, internal oblique, and transversus abdominis) as they converge in the midline to form the median linea alba.
- The composition and arrangement of muscle layers differ depending on the location with respect to the arcuate line.
- Inferior to the arcuate line, the aponeuroses of all 3 lateral abdominal muscles pass anterior to the rectus abdominis muscle.
- At this level, the internal aspect of the rectus abdominis muscle is in direct contact with the transversalis fascia.
Camper's Fascia and Scarpa's Fascia
- Camper's fascia is a thick superficial layer of adipose and areolar connective tissue that sits just deep to the skin of the abdomen.
- It is more prominent in the lower aspect of the abdomen (inferior to the umbilicus).
- Scarpa's fascia is a deep membranous layer that sits between Camper's fascia and the rectus sheath.
- It is anchored laterally to the aponeurosis of the external oblique and medially to the linea alba of the rectus sheath.
Abdominal Muscles
Anterior Abdominal Wall Muscles
- Obliquus externus abdominis (External abdominal oblique muscle):
- Origin: External surfaces of lower 8 ribs
- Insertion: Linea alba, pubic tubercle, anterior half of iliac crest
- Function: Nerve supply from intercostal nerves (T7 to T12)
- Obliquus internus abdominis (Internal abdominal oblique muscle):
- Origin: Lateral 1/3 of inguinal ligament, anterior 2/3 of iliac crest, thoracolumbar fascia
- Insertion: Linea alba, lower 3 ribs
- Function: Nerve supply from intercostal nerves (T6 to T12) & L1
- Transversus abdominis muscle:
- Origin: Not specified
- Insertion: Not specified
- Function: Not specified
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
