Lower GI: Digestion and Defacation

Question 1

What parts make up the lower part of the gastrointenstinal tract?

Answer 1

Jejunum and ileum of the small intestine and the large intestine (caecum, vermiform appendix, ascending colon, transverse colon, descending colon, sigmoid colon, rectum, anal canal

Question 2

What is derived from the embryonic foregut?

Answer 2

Esophagus, stomach, proximal duodenum, liver, gall bladder, pancreas

Question 3

What is derived from the embryonic midgut?

Answer 3

Distal Duodenum. jejunum, ileum, caecum, vermiform appendix, ascending colon, proximal 2/3 transverse colon

Question 4

What is derived from the embryonic hindgut?

Answer 4

Distal 1/3 transverse colon, descending colon, sigmoid colon, rectum, proximal anal canal.

Question 5

How wide is the external oblique muscle?

Answer 5

8 digitations from inferior 8 ribs

Question 6

What is the fibre orientation of the external oblique?

Answer 6

Inferomedial

Question 7

Where are the insertion points of the external oblique?

Answer 7

linea alba; fibrous band from xiphoid process to pubic symphsis, lilac crest, pubic tubercle

Question 8

When does the external oblique become aponeurotic?

Answer 8

Aponeurotic anterior, medial to tip of the 9th costal cartillage forming a rectus sheath which covers the rectus abdominus

Question 9

What is an important feature of the external oblique muscle?

Answer 9

Inguinal ligament forms from antero superior iliac spine to pubic tubercle

Question 10

Origin of Internal Oblique?

Answer 10

Lumbar fascia, iliac crest, last 2/3 inguinal ligament

Question 11

Fibre orientation of Internal OB?

Answer 11

Superomedial