Anatomy Lecture 20_Anterior Abdominal Wall Flashcards
Increasesd abdominal pressure can aid in what 4 bodily processes?
• Respiration • Defecation • Micturition • Parturition
What causes hernias?
Increased intra-abdominal pressure in areas of weakness
What are the nine subdivisions of the abdominal cavity
- Right hypocondriac
- Right Lumbar
- Right iliac/ inguinal
- Epigastric
- Umbilico
- Hypogastric
- Left hypocondriac
- left lumbar
- Left iliac/inguinal
What are the 8 layers of the anterior abdominal wall
- Skin
2.Superficial fatty (Camper’s) fascia
3.Deep membranous (Scarpa’s) fascia
4.Potential space
5.Muscular layers (3) separated by superficial,
intermediate, deep investing fasciae
6.Endoabdominal fascia (Transversalis fascia) - Extraperitoneal fat (variable)
8.Parietal peritoneum
Where does the Superficial fatty (Camper’s) layer of
subcutaneous fascia extend and what ateries and blood vesseles does it contain?
• continuous with superficial fascia of
thorax & lower limb
• continues into labia majora (females)
• NOT scrotum (males)
• contains superficial epigastric arteries
and veins
Where does the Deep membranous (Scarpa’s) layer of
subcutaneous fascia extend in the body. can it be sutured
- Scrotum (as Dartos fascia)
- Perineum (as Colles’ fascia)
- Does NOT continue into thighs
Yes sufficiently dense to hold sutures
What is the clinical significance of the potential space between Scarpa’s fascia and underlying superficial investing fascia?
Extravasated fluids can pool there
What are the three muscle layers in the abdominal wall (order from most superficial to deep)
External obliques
Internal obliques
Transverse Abdominales
What is the Endoabdominal (transversalis) fascia
It is the deepest layer of facia in the abdominal cavity. It is continiouse with the endothoracic fascia. it is seperate from the deep investing facia that encases the transverse abdominales
What is the serous lining of abdominal cavity
Parietal peritoneum
What 2 nerves inervates the external obliques?
Thoraco-abdominal nn. (T7-T11) &
Subcostal n. (T12)
How do the external obliques rotate the trunk
to the side opposite the one contracting
What directions do the internal obliques rotate the trunk?
To the side that is contracting
What 4 nerves inervate the internal obliques?
- Thoraco-abdominal n. (T6-T11)
- Subcostal n. (T12)
- Iliohypogastric n. (L1)
- Ilioinguinal n. (L1)
What 4 nerves intervate the transvers abdominalis
- Thoraco-abdominal n. (T6-T11)
- Subcostal n. (T12)
- Iliohypogastric n. (L1)
- Ilioinguinal n. (L1)