Term
| as the gut tube elongates what forms, in general |
|
Definition
|
|
Term
| where does the vitiline duct appear |
|
Definition
| at the apex of the primary loop |
|
|
Term
| what does the vitiline duct connect |
|
Definition
| yolk sac to intestinal loop |
|
|
Term
| which side of the primary intestinal loop grows faster |
|
Definition
|
|
Term
| what are the limbs of the intestinal loop |
|
Definition
|
|
Term
| what does the cephalic limb of intestinal loop make |
|
Definition
|
|
Term
| what does the caudal limb of the intestinal loop make |
|
Definition
| ileum, cecum, ascending colon, 2/3 of transverse colon, appendix |
|
|
Term
| what occurs in physiological herniation, why |
|
Definition
| rapid growth of gut tube, abdominal cavity is too small, loop goes into extra embryonic cavity in the umbilical cord |
|
|
Term
| approx when does physiological herniation ocur |
|
Definition
|
|
Term
| what is the axis the gut tube rotates around during development |
|
Definition
| superior mesenteric artery |
|
|
Term
| total, what is the rotation of the gut tube |
|
Definition
| 270 deg counter clockwise |
|
|
Term
| why do loops form in the small intestines |
|
Definition
| elongation continues and loops form so it will fit |
|
|
Term
| the gut tube rotates 270 deg in development: what are the components of this rotation, where do they happen |
|
Definition
| 90 deg is during herniation, 180 deg is during intestinal loop formation |
|
|
Term
| why do the intestines go back into the abdominal cavity |
|
Definition
| room has been made: liver is smaller, kidney regreses, the cavity is bigger |
|
|
Term
| about when do the intestines move back into the abdominal cavity |
|
Definition
|
|
Term
| what re-enters the abdominal cavity first after herniation, where does it go, what does this do to its shape |
|
Definition
| jejunum comes in an makes diagional coils due to its diagonal descent |
|
|
Term
| what re-enters the abdomination cavity second after herniation, where does it go |
|
Definition
|
|
Term
| what is the last thing to re-enter the abdominal cavity after herniation |
|
Definition
|
|
Term
| when does the cecal bud begin to form |
|
Definition
|
|
Term
| describe the formation of the cecal bud and its descent from re-enterence into the abdominal cavity |
|
Definition
| conical dilation in caudal loop, it starts on the upper right and descends to iliac fossa over time as appendix forms |
|
|
Term
| what are the common locations of the appendix |
|
Definition
|
|
Term
| why is the appendix commonly retrocecal or retrocolic |
|
Definition
| because it forms as the cecum is descending and is dragged up behind it |
|
|
Term
| what develops from the hind gut |
|
Definition
| distal 1/3 of transverse colon, descending colon, rectum, upper anal canal |
|
|
Term
| what does the endoderm from the hindgut form |
|
Definition
| bladder lining and urethra |
|
|
Term
| what forms the primitive anorectal canal |
|
Definition
| cloacal part of the hindgut entering the posterior cloaca |
|
|
Term
| what forms the primitive urogenital sinus |
|
Definition
| allantos part of the hindgut entering the anterior cloaca |
|
|
Term
|
Definition
| endoderm lined cavity, bound at enterence by endoderm (cloacal membrane). forms urogenital and hindgut place to empty |
|
|
Term
| what forms the urorectal septa |
|
Definition
| mesothelium of allentos and yolk sac |
|
|
Term
| what does the urorectal septa seperate |
|
Definition
|
|
Term
| when does the urorectal septa form, what events are happening |
|
Definition
| during growth and caudal folding |
|
|
Term
| what does the urorectal septa come close to and never touch? what then happens to this structure? when? |
|
Definition
| cloacal membrane. week 7 it reupures |
|
|
Term
| what does the cloacal membrane form when it ruptures |
|
Definition
| anal canal and ventral urogenital sinus |
|
|
Term
| what closes off the anal canal, when |
|
Definition
| week 7, proliferation of ECTODERM |
|
|
Term
| what does prolieration of ECTODERM CLOSE OFF IN DIGESTIVE DEVELOPMENT KNOW THIS |
|
Definition
|
|
Term
| where does the caudal end of the anal canal come from |
|
Definition
|
|
Term
| where does the crainial end of the anal canal come from |
|
Definition
|
|
Term
| what supplies blood to the caudal anal canal, where does it come from |
|
Definition
| internal pudendial gives inferior rectal a |
|
|
Term
| what type of tissue is the caudal end of the anal canal |
|
Definition
|
|
Term
| where does blood supply for the cranial end of the anal canal come from, what is it a branch of |
|
Definition
| inferior mesenteric gives superior rectal a |
|
|
Term
| what type of tissue is the cranial anal canal |
|
Definition
|
|
Term
| what does the pectinate line seperate |
|
Definition
| ectoderm and endoderm origin in the anal canal, blood supply and tissue changes |
|
|
Term
| what happens after the ectoderm closes off the anal canal, when |
|
Definition
|
|
Term
| what causes gastroschisis |
|
Definition
| herniation of abdominal viscera into abdominal cavity lateral to umbilicus |
|
|
Term
| what is a dangerous possibility when someone has gastroschisis |
|
Definition
| the organs out in the amniotic fluid could be damaged by the fluid |
|
|
Term
| how can you tell if someone has gastroschisis |
|
Definition
| a-fetoprotein will show in amniotic fluid |
|
|
Term
| what situation or description of people would indicate increased risk for gastroschisis |
|
Definition
| males, children of a mother who did cocaine |
|
|
Term
|
Definition
| NOT a chromosome abnormaility |
|
|
Term
| how can gastroschisis be treated |
|
Definition
|
|
Term
|
Definition
| herniation of the abdominal viscera through enlarged umbilical ring |
|
|
Term
| how is omphalocele different from gastroschisis |
|
Definition
| the abdominal organs have amnion covering and it is caused by the bowl not returning properlly due to a chromosome abnormaility |
|
|
Term
| what are the symptoms of omphalocele |
|
Definition
| high mortality, cardiac and neural tube defects, malformation |
|
|
Term
| what causes meckel's diverticulum KNOW ME |
|
Definition
| vitiline duct stays forming ileum outpocket called ileal diverticulum |
|
|
Term
| what are the normal symptoms of meckel's diverticulum KNOW ME |
|
Definition
|
|
Term
| what are the rare symtpoms of meckel's diverticulum, what causes them KNOW ME KNOW ME |
|
Definition
| it has heterotrphic pancreatic tissue or gastric mucosa in it that can cause ulceration, bleeding, perforation |
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
| where can atresia and stenosis occur KNOW KNOW KNOW |
|
Definition
| anywhere in gut but MOSTLY IN THE DUODENUM |
|
|
Term
| WHAT OCCURS MOSTLY IN THE DUODENUM KNOW KNOW KNOW |
|
Definition
|
|
Term
| why does atresia or stenosis occur in the upper duodenum |
|
Definition
| because of poor recanalization |
|
|
Term
| why does atresia or stenosis occur in the middle and lower duodenum |
|
Definition
| vessel occlusion or decrease so segment dies and causes narrowing or loss or segment |
|
|
Term
| what cause retrotrthreal and rectovaginal fistulas |
|
Definition
| abnormal cloacal or urorectal septum formation because cloaca is too small, rectum is not caudal enough, hindgut shifts, etc |
|
|
Term
| what causes rectoanal atresia |
|
Definition
| usually vascular issue, loss of rectum or anus |
|
|
Term
| what cause imperforate anus |
|
Definition
| anal membrane does not break down |
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|
