Blood supply, nerves ect

Question 1

Where is portal vien formed?

Answer 1

transpyloric plane at L1

Question 2

ANS - parasympathetic and sympathetic nerves

Answer 2

PARASYMPATHETIC:
• Vagus Nerve (CN X)
• Pelvic Splanchnic nerves S2-4
SYMPATHETIC:
• Thoracic, Lumbar and Sacral Splanchnic nerves • From T5-L2 sympathetic ganglia

Control:
• Viscera, glands, blood vessels
• Smooth muscle
• Non-conscious control
• Motor & Sensory

Question 3

Sympathetic and parasympathetic supply for foregut, midgut and hindgut

Answer 3

Sympathetic
Foregut - greater splanchnic
Midgut - Leser splanchnic
Hindgut - lumber/sacral splanchnic

Parasympathetic

• foregut and midgut - vagus
• hindgut - pelvic splanchnic

Question 4

How is pain referred?

Answer 4

referred back to origin spinal levels of sympathetic supply via afferent fibers and then via dorsal root (splanchnic nerves)

Foregut - greater splanchnic - epigastric pain
Midgut - Lesser splanchnic - umbilical
Hindgut - lumbar and sacral splanchnic - suprapubic region

Question 5

Appendicities

Answer 5

• becomes enflamed
• afferent sympathetic fibers refere pain back to lesser splanchnic nerve region
• diffuse pain around umbilical region (even tho is further down)
• then presses on parietnal peritonoum - somatic sensory supply, and then pain is felt as acute and localised to lower right quadrant