Esophagus Flashcards
Where does it extend from?
C5-6 to T11
@ ½ inch diameter at pharynx
@ 1 inch diameter at stomach
The esophagus is posterior to the trachea true or false?
True
Outer and Inner fibers?
Outer=longitudinal fibers
Inner=circular fibers
What inches are striated, mixed, and unstriated?
upper 1 inch is striated fibers
next 3 inches are mixed
lower 6 inches are unstriated
Continuous with what?
The pharynx at the PE segment
wiki says the laryngeal portion of the pharynx
Middle segment
Middle 8 inches
Thoracic segment
Upper esophageal sphincter (UES) (what inches)
Upper 1 inch
Lower esophageal segment (LES)
Lower 1 inch
a.k.a cardiac segment
Muscles of UES do what?
Keep food and secretion from going down the windpipe
inferior pharngeal constrictor muscle
allows the entry to the esophagus to open only when chewing and swallowing
LES muscles do what?
When the LES is closed, it prevents acid and stomach contents from traveling backwards from the stomach.
The LES muscles are not under voluntary control
Between what?
The spine and trachea
