Anterior Abdominal Wall/Inguinal Canal Flashcards
What are the 4 reference planes for the abdomen?
RUQ
LUQ
RLQ
LLQ
What are the transverse planes of the abdomen?
Transpyloric plane
Subcostal plane
Transtubercle plane
Interspinous plane
What are the 8 abdominal regions?
R/L Hypochondrium Epigastric R/L Flank Umbilical R/L Inguinal Pubic
At what level is the transpyloric plane?
L1
The inferior border of the ___ costal cartilage is what plane?
10th; Subcostal plane
Between _____ is the transtubercle plane
Iliac tubercles
Between _____ is the interspinous plane
ASIS
How high can the abdominopelvic cavity extend?
4th intercostal space
What lines the abdominopelvic cavity?
Peritoneum
What makes up the walls of the abdominopelvic cavity?
Muscles, bones, CT
From superficial to deep, what are the fascial layers of the abdomen?
Integument
Camper’s Fascia
Scarpa’s Fascia
What is Camper’s Fascia made of?
Fatty layer of superficial fascia
What is Scarpa’s Fascia continuous with?
Fascia lata of lower limb AND Colle’s fascia of perineum
Fluid could flow from the Scarpa’s Fascia to where?
Superficial (Colle’s) Fascia of perineum
Most superficial abdominal muscle?
External Abdominal Oblique
What muscle creates the inguinal ligament, opening of the superficial inguinal ring and the lacunar ligament?
External Abdominal Oblique
Innervation and action of External Abdominal Oblique?
Ventral Rami
Compress abdomen, move and rotate trunk
What 2 muscles fibers run 90 degrees to each other?
External and Internal Abdominal Oblique
Innervation and action of Internal Abdominal Oblique?
T7-L1
Compress abdomen, support viscera, laterally flex and rotate trunk
Muscle fibers from what muscle run horizontally across the abdomen?
Transversus Abdominus
Innervation and action of transversus abdominus
T7-L1
Suppress and support abdominal viscera
This muscle has tendinous intersections, runs from pubic symphysis to 5-7 intercostal cartilages
Rectus Abdominus
Innervation and action of rectus abdominus?
T7-T12
Flex and compress abdomen
What is the rectus sheath?
Aponeuroses and fascia of muscles that encompass rectus abdominus
What is the arcuate line?
Sharp transition where all aponeuroses become anterior to rectus abdominus
Describe the rectus sheath above the arcuate line
- The external abdominal oblique aponeurosis runs anteriorly to rectus abdominus
- The internal abdominal oblique aponeurosis splits and runs both anteriorly and posteriorly to rectus abdominus
- The transversus abdominus aponeurosis runs posteriorly to rectus abdominus
Describe the rectus sheath below the arcuate line
ALL aponeuroses fun anteriorly to rectus abdominus
Below the arcuate line, what is the rectus abdominus in contact with posteriorly?
Transversalis fascia
What are the nerves of the anterior abdominal wall?
Thoraco-abdominal
Subcostal
Iliohypogastric
Ilioinguinal
Where do the nerves of the anterior abdominal wall run?
Between internal abdominal oblique muscle and the transversus abdominus muscle
Lymph vessels superior to the umbilicus drain where?
Axillary and parasternal lymph nodes
Lymph vessels inferior to the umbilicus drain where?
Superficial inguinal lymph nodes
What forms the inguinal canal?
The end of the external abdominal oblique muscle rolls up to create the inguinal ligament that forms a shelf
Entrance to inguinal canal and beginning of invagination of peritoneum into transversalis fascia
Deep ring
Exit of inguinal canal
Superficial ring
What runs in the inguinal canal in males?
Spermatic cord
What runs in the inguinal canal in females?
Round ligament
What nerves run in the inguinal canal?
Ilioinguinal nerve and the genital branch of the genitofemoral nerve
What nerve exits lateral to the spermatic cord?
Ilioinguinal nerve
Gonads form near what level?
T10
What connects gonads to the future scrotal swellings?
Gubernaculum
Out-pocketing of peritoneal cavity
Processus vaginalis
Gonads descend along the ______ carrying vessels with them to the scrotum
Processus vaginalis
Remains of the processus vaginalis around testes?
Tunica vaginalis
What layers of the abdominal wall are carried down as the spermatic cord develops?
Transversalis fascia
Internal abdominal oblique muscle
External abdominal oblique muscle
Undescended testes
Cryptorchid testes
Cryptorchid testes increase your risk for?
Testicular cancer
As the spermatic cord develops, the transversalis fascia becomes?
Internal spermatic fascia
As the spermatic cord develops, the internal abdominal oblique muscle becomes?
Cremasteric muscle
As the spermatic cord develops, the external abdominal oblique muscle becomes?
External spermatic fascia
What are the spermatic cord contents?
Vas deferens
Testicular A. and V.
Gonadal nerves and lymphatics
Peritoneal fluid accumulation in the tunica vaginalis
Hydrocele
How is hydrocele detected?
Transillumination - light passes through
Blood accumulation in the tunica vaginalis
Hematocele
Can transillumination occur with hematocele?
No
Scrotum lymph drains where?
Superficial inguinal lymph nodes
Testes lymph drains where?
Lumbar and pre-aortic lymph nodes
As the ovaries begin to descend, the gubernaculum attaches to what?
Uterus
The gubernaculum creates what for females?
Ovarian ligament and round ligament of the uterus
The round ligament enters the inguinal canal and attaches where?
Labial swellings
Boundaries of inguinal (hasselbach’s) triangle?
Inguinal ligament
Lateral border of rectus abdominus
Lateral umbilical ligament
Hernial sac alongside spermatic cord
Direct inguinal hernia
Hernial sac within spermatic cord
Indirect inguinal hernia
Hernia below inguinal ligament, common in women
Femoral hernia