Anatomy of the Anterior Abdominal Wall and the Inguinal Canal Flashcards
What are the 9 regions of the abdomen?
Right hypochondrium
Right flank (lumbar)
Right inguinal (groin, iliac)
Epigastric
Umbilical
Hypogastric (pubic)
Left hypochondrium
Left flank (lumbar)
Left inguinal (groin, iliac)
What are the 4 quadrants of the abdomen?
Right upper quadrant
Right lower quadrant
Left upper quadrant
Left lower quadrant
What is the L1/2 plane?
Transpyloric plane
What is the L4/5 plane?
Intertubercular plane
What are the layers of the anterior abdominal wall?
Skin
Superficial fascia
Deep fascia
Muscles
Fascia transevarsalis
Extraperitoneal fat
Parietal peritoneum
What are the components of the superficial fascia?
Fatty layer: Camper’s fascia
Membranous layer: Scarpa fascia
What are the different muscles of the anterior abdominal wall?
External oblique
Internal oblique
Transversus
What are the layers of the skin of the anterior abdominal wall?
Epidermis
Dermis
Subcutaneous tissue
Muscle
What are the Langer’s skin lines?
They indicate the predominant direction of collagen fiber bundles in the dermis
What is the relation between lacerations/cuts and Langer’s skin lines?
Incision or laceration running parallel to the Langer’s lines have less tendency to gape than those crossing them
Which muscle is associated with the fatty layer of the superficial fascia?
Darto’s muscle
Which fascia is associated with the Scarpa’s fascia?
Colles’ fascia
What is the deep fascia of the anterior abdominal wall?
A thin layer of connective tissue covering the muscles
What is the deep fascia in the limbs like?
It forms a complete investment to the muscles and is fused with the periosteum over the subcutaneous surfaces of the bones
What are the components of the external oblique?
Superficial inguinal ring
External spermatic fascia
Inguinal ligament
What is the point of origin of the external oblique muscle?
Lower eight ribs
What are the different insertion points of the external oblique muscles?
Xiphoid process
Linea alba
Pubic symphysis, crest, and tubercule
The anterior half of the ileac crest, including ASIS
What is ASIS?
Anterior superior iliac spine, bony projection of the iliac bone
What are the components of the internal oblique?
Cremaster muscle
Conjoint tendon
What are the points of origin of the internal oblique muscle?
Thoracolumbar fascia
Iliac crest
Lateral 2/3 of the inguinal ligament
What are the insertion points of the internal muscle?
Xiphoid process
Linea alba
Pubic crest (via conjoint tendon)
Lower three ribs and costal cartilages
What are the origin points of the transversus?
Thoracolumbar fascia
Iliac crest
Lower six costal cartilages
Lateral 1/3 of the inguinal ligament
What are the insertion points of the transversus muscle?
Xiphoid process
Linea alba
Pubic crest (via conjoint tendon)
What connects the internal oblique and the transversus?
Conjoint tendon
What are the origin points of the rectus abdominis?
Symphysis pubis
Pubic crest
What are the insertion points of rectus abdominis?
Xiphoid process
5th, 6th and 7th costal cartilages