|
|
|
|
|
|
| The muscle at
the |
|||||
| upper end of
the |
|||||
| esophagus |
|||||
| functions like
a |
|||||
| sphincter, but
it is |
|||||
| not a
structural |
|||||
| sphincter. |
|||||
| Deglutition |
| Uvula lifts
up |
| bolus |
|
|
| Upper
esophageal |
|
| muscle
contracted |
|
|
|
|
|
| Upper
esophageal |
|||
| muscle
relaxes, |
|||
| bolus
is pushed |
|||
| into
esophagus. |
|||
| Figure 24.13 |