Flashcards in PBL - Patient With Facial Incised Wound Deck (42)
What are the main vessels which supply the face?
Superficial temporal artery
Where does the facial artery arise from?
Where does the facial artery cross onto the face?
Crosses lower border of mandible 2.5cm in front of the angle of the mandible.
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
Where does the superficial temporal artery arise from?
The maxillary branch of the external carotid
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
Describe the venous drainage of the face.
Main veins are paired with arteries and drain to the internal jugular vein
Which salivary gland is the largest?
Which important vessels are found within the parotid gland?
Facial nerve and branches
Where the external carotid artery branches to superficial temporal artey
How long it the parotid duct?
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
Where is the submandibular gland located?
Between the lower surface of the mandible and myohyoid muscle
Where does the submandibular duct open in the mouth?
Beside the frenulum of the tongue
Which gland is the closest to the oral cavity?
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
What kind of cells are found in the acinus of the salivary glands?
What kind of cells have processes that extend over the outer surface of the acini?
List functions of saliva.
How much of total secretions from the salivary glands does each one provide?
Parotid - 25%
Submandibular - 70%
Sublingual - 5%
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
What aquaporin channels are found in salivary acinar cells?
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
What osmolality is the final salivary secretion compared to plasma?
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.
What can form is the parotid duct is damaged?
- a collection of salivary leaked from a damaged salivary duct or gland
What does a salivary mucocele look like?
A blue/transleuent swelling just under the lining of the mouth
Where does the facial nerve originate?
Between the pons and the medulla
What is the intermediate nerve of the facial nerve?
Contains special afferent fibres for taste
Where does the facial nerve leave the cranial fossa?
The internal acoustic meatus