Anterior Abdominal Wall Flashcards
from the skin to the parietal peritoneum, what are the fascial layers of the abdominal wall?
skin, fatty layer, membranous layer, transversalis fascia, parietal peritoneum
what are the attachment, innervation, and action of the external oblique muscle?
attachment - external surface of ribs 5-12, linea alba, pubic tubercle, anterior 1/2 iliac crest
innervation - thoracoabdominal nerve (T7-11), subcostal nerve (T12)
action - flexion and contralateral rotation of trunk
what does the inferior margin of the external oblique form?
inguinal ligament
what muscle of the abdominal wall is the largest and most superficial with fibers that run inferomedially?
external oblique
what are the attachment, innervation, and action of the internal oblique muscle?
attachment - thoracolumbar fascia, anterior 2/3 iliac crest, inguinal ligament, inferior border of ribs 10-12, linea alba, pecten pubis
innervation - thoracolumbar nerve, subcostal nerve, 1st lumbar nerve
action - flexion and ipsilateral rotation of trunk
what muscle of the abdominal wall is the intermediate layer, with an inferior margin that helps form the conjoint tendon
internal oblique
the neurovascular plane is where in relation to the internal oblique muscle?
deep
what vessels are a part of the neurovascular plane?
thoracoabdominal nerve, subcostal nerve, iliohypogastric nerve, ilioinguinal nerve, inferior intercostal artery, subcostal artery, lumbar artery, deep circumflex iliac artery
what are the attachment, innervation, and action of the transversus abdominis?
attachment - internal surface of costal cartilage 7-12, thoracolumbar fascia, iliac crest, inguinal ligament, linea alba, pubic crest, pecten pubis
innervation - thoracolumbar nerve, subcostal nerve, L1
action - compress abdominal viscera
what muscle is the innermost of the abdominal wall?
transversus abdominis
what muscle is the vertical muscle of the abdominal wall?
rectus abdominis
what are the attachment, innervation, and action of the rectus abdominis?
attachment - pubic symphysis, pubic crest, xiphoid process, 5-7th costal cartilage
innervation - thoracoabdominal nerve
action - flex trunk, compress abdominal viscera
what is the rectus abdominis enclosed in?
rectus sheath
what are the connective tissues that are part of the rectus abdominis?
tendinous intersections, linea alba, umbilical ring
what are the functions of the muscle of the abdominal wall?
support abdomen, protect underlying viscera, increase abdominal pressure, move trunk, maintain posture
what muscles perform flexion of the trunk?
rectus abdominis, psoas major
what muscles perform ipsilateral rotation of the trunk?
internal oblique, iliocostalis, longissimus
what muscles perform contralateral rotation of the trunk?
external oblique, transversospinalis
what are the nerves that are found in the anterior abdominal wall?
thoracoabdominal nerves (branch into anterior abdominal cutaneous nerves), subcostal nerves (T12 ventral ramus), iliohypogastric nerves (L1 ventral ramus), ilioinguinal nerves (L1 ventral ramus), nerve to umbilicus (T10)
what forms the inguinal ligament?
inferior margin of external oblique
what are the boundaries of the inguinal ligament?
ASIS to pubic tubercle
what does the inguinal ligament form?
anterior and inferior wall of inguinal canal
what reinforces the inguinal canal?
lacunar ligament
what is the opening of the femoral canal inferior to the inguinal canal?
femoral ring
