Nerve Supply of GIT

Nerve Supply of GIT

1. Enteric Nervous Supply

   • myenteric plexus
     • inhibit contraction of sphincters
     • stimulate glandular secretion
   • submucosal plexus
     • stimulate contraction of gastrointestinal muscles promoting peristalsis

2. ANS

   • sympathetic
     • thoracic splanchnic nerve
     • lumbar splanchnic nerve
     • 5th - 12th thoracic segments
     • pain sensation
   • parasympathetic
     • vagus
       • proximal 2/3 of the transverse colon
     • pelvic splanchnic nerve
       • rest of the colon
     • sensation

3. anal canal

   • upper 1/2
     • sympathetic & parasympathetic
     • inf. hypogastric plexus
     • strech
   • lower 1/2
     • inf. rectal nerve ( branch of pudendal nerve)
     • pain, temp, touch & pressure

4. referred pain

   • greater splanchnic nerve
     • in the epigastrium
   • lesser splanchnic nerve
     • around the umbillicus
   • lumbar splanchnic nerve
     • in the hypogastrium

5. Hirschsprung's disease (megacolon)

   • failure of development of myenteric plexus in the distal part of the colon

6. eosophageal achalasia

   • eosophageal motility disorder