This is the first video of a 6part video series on Gastrointestinal Physiology.
I would recommend watching the video listed below prior to beginning the GI physiology series.

21 High Yield Facts for USMLE Step 1/COMLEX Level 1: Gastrointestinal Histology and Anatomy:    • 21 High Yield Facts for USMLE Step 1/...  

Topics discussed in this video include:
Phasic vs Tonic Contractions
Slow waves and Interstitial cells of Cajal
Characteristic Frequency patterns
Phases of Swallowing
Cleft Lip/Palate
Treacher Collins Syndrome
Pierre Robin syndrome
Swallowing Reflex
Zenker Diverticulum
Esophageal strictures
Esophageal Motility
Nucleus Ambiguus, Nucleus Solitarius, Dorsal Motor Nucleus
Inhibitory and Excitatory Esophageal Neurotransmission

Check out my other videos on High Yield USMLE Step 1/COMLEX Level 1 Facts:
Molecular Biochemistry:    • Video  
Cellular Biochemistry:    • 36 High Yield Facts for USMLE Step I/...  
Microbiology:    • 25 High Yield Facts for USMLE Step 1/...  
GI/Resp Anatomy and Embryology:    • 25 High Yield Facts for USMLE Step 1/...  
Cardio Anatomy and Physiology:    • 25 High Yield Facts for USMLE Step 1/...