abdominal wall and development Flashcards
what are the muscles that make up the abdominal wall
lateral - external abdominal oblique, internal abdominal oblique and transverse abdominal muscle
ventrally the rectus abdominus
nerve supply to the abdominal wall muscles
spinal nerves of the last thoracic vertebra L1-L5
dorsal roots innervate dorsal musculature
ventral roots split into medial, lateral and lateral cutaneous branches
development of the abdominal organs from embryological origin
gut formed from yolk sac
midgut separated from foregut- differentiates into rest of duodenum, jejunum, ileum, caecum, ascending/transverse colon
foregut - differentiates into pharynx, oesophagus, stomach and initial duodenum.
hindgut differentiates into descending colon and rectum.
functions of abdominal wall muscles
encloses the abdominal cavity and its contents
motor functions- contraction used in vomiting, defaecation and micturition
used in breathing, coughing, sneezing
where does the rectus abdominis muscle originate from
ventral surface of sternum
where does the rectus abdominis muscle insert
cranial border of pubis via pre-pubic tendon
where does the external oblique abdominal muscle originate from
caudal surfaces of ribs 4+ and lumbodorsal fascia
where does the external oblique abdominal muscle insert
linea alba and prepubic tendon
where does the internal oblique abdominal muscle originate from
coxal tuber and lumbodorsal fascia
where does the linea alba insert
last rib and cartilages of caudal ribs
where does the transverse abdominal muscle originate from
medial surfaces of ventral parts of caudal ribs and deep lumbodorsal fascia
where does the transverse abdominal muscle insert
linea alba
what is the sheath of the rectus abdominis muscle formed from
tendons of the lateral abdominal wall muscles
they pass above and below rectus abdominis to join midline which forms the linea alba.
what forms the gut
yolk sac
what does the foregut differentiate to after separation from midgut
pharynx, oesophagus stomach and initial duodenum
