10/8 Abdomen I Flashcards
rectus abdominus
o/i/inn/action
pubic crest
xiphoid process and costal margin
lower 6 intercostal, subcostal, iliohypogastric, ilioingunal nn
trunk movement, breathing, defecating, support
external abdominal oblique
o/i/inn/action
lower 8 ribs
rectus sheath
lower 6 intercostal, subcostal, iliohypogastric, ilioingunal nn
trunk movement, breathing, defecation, support
internal abdominal oblique
o/i/inn/action
lateral 2/3 of inguinal ligament, iliac crest, and thoracolumbar fascia
rectus sheath
lower 6 intercostal, subcostal, iliohypogastric, ilioingunal nn
trunk movement, defecation, breathing, support
transversus abdominis
lateral 1/3 of inguinal ligament, iliac crest, thoracolumbar fascia
rectus sheath
lower 6 intercostal, subcostal, iliohypogastric, ilioinguinal nn
trunk movement, support, breathing, defecation
what vertebral level/dermatome: transumbilical plane
L3 disc
T10
what vertebral level: transpyloric plane
L1 disc
what is the tela subcutanea
just deep to the skin of the abdomen
superficial fatty layer = Camper’s fascia
deep membranous layer: Scarpa’s fascia
difference above/below arcuate line
above, anterior and posterior recuts sheath
below, you only have anterior rectus sheath
which abdominal aa anastomose?
sup and inf epigastric aa
what are the two relevant branches of the internal thoracic a
sup epigastric a
musculophrenic a
what are the two relevant branches of the external iliac a
inf epigastric a
deep cicumflex iliac a
layers of the inguinal canal (sup to deep)
EAO (superficial inguinal lig)
IAO
TA
transversalis fascia (deep inguinal ring) (inf epigastric v/a pass medially)
what makes up the inguinal ligament
underturned inferior margin of the EAO, inserts on pubic tubercle
what is the conjoint tendon, and other name
falx inguinalis
inserts on pubic crest
contributions from IAO and TA
boundaries of the inguinal canal (buckle up)
roof: TA/IAO
floor: inguinal ligament, lacunar ligament
ant: TA/IAO
post: transversalis fascia, conjoint tendon, inf epigastric v/a
what is the deep inguinal ring
opening in the transversalis fascia
what is the superfascial inguinal ring
slit in EAO aponeurosis, medial and lateral crura
what is the “weak spot?”
hasselbach’s triangle/inguinal triangle
lateral margin of RA, inf epigastric v/a, inguinal ligament
site of direct hernias
layers of the spermatic cord
pulls them down through inguinal rings
external spermatic fascia (from EAO aponeurosis)
cremasteric m + fascia (from IAO)
internal spermatic fascia (from transversalis fascia)
contents of spermatic cord
vas deferens
testicular a
pampiniform venous plexus
genital branch of genitofemoral n
two types of inguinal hernias
direct
indirect
direct inguinal hernia
goes through abdominal wall
medial to epigastric v/a
through hasselbach’s triangle
indirect inguinal hernia
passes through inguinal canal
lateral to epigastric a/v
w/in spermatic cord (to scrotal sac)
