MRCP UK EXAMINATIONS

ABDOMINAL

GASTROINTESTINAL

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
From which embryonic layer does the primitive intestine derive?
A
ectoderm
B
mesoderm
C
neural crests
D
endoderm
Explanation: 

Detailed explanation-1: -Mesoderm gives rise to the connective tissue, including the wall of the gut tube and the smooth muscle. Endoderm is the source of the epithelial lining of the gastrointestinal tract, liver, gallbladder, pancreas.

Detailed explanation-2: -because endoderm is formed by both epiblast and hypoblast cells.

Detailed explanation-3: -The primitive gut tube is divided into three sections. The epithelium of and the parenchyma of glands associated with the digestive tract (e.g., liver and pancreas) are derived from endoderm.

Detailed explanation-4: -The endoderm constructs the digestive tube and the respiratory tube. 15. Four pairs of pharyngeal pouches become the endodermal lining of the eustacian tube, tonsils, thymus, and parathyroid glands. The thyroid also forms in this region of endoderm.

Detailed explanation-5: -Embryological science believes that the enlarging intestines quickly outgrow the space available in the abdominal cavity causing the entire midgut to herniate into the umbilical cord forming a loop. The superior limb of the intestinal loop forms the ileum while the inferior limb forms the colon.

There is 1 question to complete.