Anatomy abdomen 2 Flashcards
What structures are located in transpyloric plane at vertebrae level L1?
- Origin of superior mesenteric a.
- Origin of portal vein
- Hilum of left kidney
- Origin of renal arteries
- Duodenojejunal flexure
- Termination of spinal cord
- Pylorus
What structures are located in transtubercular plane at vertebrae level L4/L5?
- Tubercles of iliac crest
- L4 / L5
- Origin of IVC
- Confluence of common iliac veins
What are the layers of the abdominal wall, anterior to posterior?
- Superficial fascia
- Anterolateral muscles
- Rectus sheath
What are the 2 layers of the superficial fascia?
- Campers(fatty)
- Scarpas(membranous)
What are the anterolateral muscles?
-External oblique muscle
-Internal oblique muscle
-Transverse abdominis muscle
What is the rectus sheath an aponeuroses of?
Aponeuroses of anterolateral muscles
What does the rectus sheath envelope?
Envelopes rectus abdominis and pyramidalis
What is the fibre direction of the external oblique muscle?
Inferomedial fibre direction
What is the fibre direction of the internal oblique muscle?
Superomedial fibre direction
What is the fibre direction of the transcersus abdominis muscle?
Transverse fibre direction
What are the actions of the anterolateral muscles?
compresses and supports abdominal viscera,
flexes and rotates trunk
What are examples of vertical muscles?
- Rectus abdominis
- Pyramidalis
What does the lateral border of the rectus abdominis form?
Lateral border forms linea semilunaris
What is the action of the rectus abdominis?
Flexion of trunk, compresses
abdominal viscera and controls tilt of pelvis
What is the action of the pyramidalis?
Tense linea alba
What is included in the deep layers of the abdominal wall?
- Posterior layer of rectus sheath
- Transversalis fascia: Thick investing fascia
- Parietal peritoneum: Lines abdominal cavity
What nerves and lymphatics does the rectus sheath envelope?
- Distal portions of thoracoabdominal nerves
- Superior and inferior epigastric vessels
- Corresponding lymphatics
What is the linea alba?
Interlacing fibres of anterolateral muscles
What does the linea alba stretch between?
Xiphoid process to pubic crest
Where does the umbilicus lie?
Lies in midline
What does the internal oblique aponeurosis split into and what are they?
Internal oblique aponeurosis splits into
two layers:
1. Anterior laminae
2. Posterior laminae