Abdominal wall, inguinal region, general relationships of abdominal viscera, peritoneum Flashcards
Dissection 13
What is anatomical name for “belly button”?
Umbilicus
How to locate transpyloric plane?
Transverse plane midway between xiphoid process and umbilicus
How to locate subcostal plane?
Transverse plane between bilateral 10th costal cartilages at respective midaxillary lines
Location of interiliac plane?
Transverse plane between bilateral iliac crests
What connects pubis to ischium?
Ischiopubic rami
Where does lacunar ligament attach?
Pecten pubis
What are dermatomal landmarks for the anterior trunk?
Xiphoid: T7
Umbilicus: T10
Inguinal: L1
What could pain to the lower right quadrant of the abdomen indicate?
Pneumonia in the lower lobe of the right lung is affecting local parietal plura - referring pain to the local abdominal wall (may simulate appendicitis) via the thoracoabdominal intercostal nerves
From superficial to deep, what are the layers of the anterior abdominal wall?
- Camper’s fatty fascia
- Scarpa’s membranous fascia (continuous with perineum fascia)
- External abdominal oblique muscle
- Internal abdominal oblique muscle
- Transversus abdominis
- Rectus abdominis
- Transversalis fascia
What does distention of superficial anterior abdominal veins indicate (caput medusae)?
An obstruction of one or more of the following:
- Superior vena cava
- Inferior vena cava
- Portal vein
What is special about the membranous fascia of he abdomen?
It is continuous with fascia of the perineum
How can a ruptured urethra be diagnosed?
Released urine is palpable as a fluid mass in the lower abdomen; continuity between Scarpa’s membranous fascia and Colles’ perineum fascia prevents urine from descending to lower limb
How is the abdomen divided into quadrants?
Transverse and sagittal planes intersecting at the umbilicus
What nerve supplies L1 dermatome?
Ilioinguinal nerve
What is external abdominal oblique aponeurosis continuous with?
- Inguinal ligament
- Lacunar ligament
- Superficial inguinal ring
- External spermatic fascia
What does internal abdominal oblique muscle join with?
Joins transversus abdominis muscle as inguinal falx tendon
Where does ilioinguinal nerve run?
Pierces internal abdominal oblique muscle near anterior superior iliac spine and runs medially to exit superficial inguinal ring
What encapsulates the abdominal viscera?
- Parietal peritoneum
2. Visceral peritoneum
What is arcuate line?
Above: rectus sheath completely surrounds rectus abdominis
Below: rectus sheath only covers anterior surface of rectus abdominis
What muscles form the rectus sheath?
- External abdominal oblique tendon (anterior)
- Internal abdominal oblique tendon (posterior)
- Transversus abdominis tendon (anterior/posterior)
What is the significance of the rectus sheath?
Encloses rectus abdominus
What is the linea alba?
Where the left and right rectus sheaths meet at the midline; it is a common surgical incision site; it is a weak point of the abdomen where a hernia can occur
What makes up the deep inguinal ring?
Transversalis fascia
What makes up the superficial inguinal ring?
- External oblique
2. Lateral and medial crura
What is a test for the L1 spinal nerve for males?
Cremasteric reflex: scratch skin of medial thigh or lower abdomen and look for cremaster muscle to elevate testes
What are the components of the spermatic cord?
- Ductus deferens (take spermatozoa from epididymis within scrotum to ejaculatory duct); is a thick muscular cord
- Testicular artery
- Pampiniform plexus of veins
- Testicular lymphatics
- Testicular plexus of autonomic nerves
- Vessels to ductus deferens
What is the female homolog of spermatic cord?
Round ligament