PBL - Patient With Facial Incised Wound Flashcards Preview

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Flashcards in PBL - Patient With Facial Incised Wound Deck (42)
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1

What are the main vessels which supply the face?

Facial artery
Superficial temporal artery

2

Where does the facial artery arise from?

External carotid

3

Where does the facial artery cross onto the face?

Crosses lower border of mandible 2.5cm in front of the angle of the mandible.

4

Where in the face are the best facial artery anastomoses?

By the superior and inferior labile branches - makes a vascular ring within the tissues of the lips

5

Where does the superficial temporal artery arise from?

The maxillary branch of the external carotid

6

What is the path of the superficial temporal artery?

Runs upwards from the neck, immediately in front of the tragus of the ear, where is can be felt

7

Describe the venous drainage of the face.

Main veins are paired with arteries and drain to the internal jugular vein

8

Which salivary gland is the largest?

Parotid gland

9

Which important vessels are found within the parotid gland?

Facial nerve and branches
Where the external carotid artery branches to superficial temporal artey
Reteromandibular vein

10

How long it the parotid duct?

5cm long

11

What is the nervous supply of the parotid gland?

Parasympathetic nerves stimulate secretion
Effected by impulses that run in the CNXI, and then the CNVIII branch

12

Where is the submandibular gland located?

Between the lower surface of the mandible and myohyoid muscle

13

Where does the submandibular duct open in the mouth?

Beside the frenulum of the tongue

14

Which gland is the closest to the oral cavity?

Sublingual gland

15

How does the sublingual gland pass its secretions into the mouth?

Through a dozen minute ducts
- some open straight into the floor
- others open into submandibular duct

16

What kind of cells are found in the acinus of the salivary glands?

Serous cells
Mucous cells

17

What kind of cells have processes that extend over the outer surface of the acini?

Myoepthielial cells?

18

List functions of saliva.

Facilitates swallowing
Helps speech
Contains alpha-amylase
Contains IgA
Contains lysozyme

19

How much of total secretions from the salivary glands does each one provide?

Parotid - 25%
Submandibular - 70%
Sublingual - 5%

20

How is the isotonic fluid (the primary secretion) formed in the acinar cells of the salivary glands?

Active transport of electrolytes followed by passive movement of water

21

What aquaporin channels are found in salivary acinar cells?

AQ5

22

How does secondary modification of salivary fluid occur?

Ion transport pumps are in the epithelial cells lining the ducts.
Sodium and chloride are reabsorbed and potassium and bicarbonate are secreted

23

What osmolality is the final salivary secretion compared to plasma?

Hypotonic

24

If flow rate of secretion increases, what happens to the ionic concentration of sailiva?

It increases in sodium, chloride and bicarbonate concentration, and decreases in potassium.

25

What can form is the parotid duct is damaged?

Salivary mucocele
- a collection of salivary leaked from a damaged salivary duct or gland

26

What does a salivary mucocele look like?

A blue/transleuent swelling just under the lining of the mouth

27

Where does the facial nerve originate?

Between the pons and the medulla

28

What is the intermediate nerve of the facial nerve?

Contains special afferent fibres for taste

29

Where does the facial nerve leave the cranial fossa?

The internal acoustic meatus

30

Where do the two facial nerve roots fuse?

Petrous part of the temporal bone