Gastrointestinal Flashcards
What are the ventral and dorsal mesentery of the foregut called
Lesser and greater omentum
What does the foregut compromise of
Mouth - duodenal papilla
What is the mesentery of the midgut
Only dorsal
What does the midgut compromise of
Major duodenal papilla to proximal 2/3 of transverse colon
What does the hindgut compromise of
Distal 1/3 transverse colon to rectum
What does the endoderm make
Epithelial lining
What does the mesoderm make
Connective tissue, muscle
When does the primitive gut tube form
4th weel
What does the primitive gut tube form from
Endoderm
Describe the oesophageal membrane
Formed 4th week
Forms mouth
Describe the clocal membrane
Formed 7th week
Rupture of caudal end of PGT
Forms anus and urogenital opening
Describe the midgut and hindgut tube formation
Elongation
Herination
Rotation - 270 degrees anticlockwise
Retraction
Fixation
Describe pharyngeal arches
Formed from oesophageal membrane
14-15th week
5 arches - 1,2,3,4,6
External - endoderm - clefts
Internal - ectoderm - pouches
What does arch one produce
CN5V3 - mandibular branch
Muscles - mastication, tensor tympani, digastric, mylohyoid
Bone - maxilla, mandible, malleus, incus
What does arch two produce
CN8
Muscles - facial expression, stapedius, stylohyoid
Bones - stapes, styloid, lesser horn of thyroid cartilage
