Parotid and Scalp Flashcards
What is the parasympathetic innervation of the parotid gland?
Auriculo temporal n (V3)
What is the cutaneous innervation of the parotid gland?
C2/3. Sensory to sheath and overlying skin.
What is Frey’s syndrome?
Complication of parotidectomy. Abberant neruro-regeneration in which the parotid parasympathetic innervation goes to cutaneous sweat gland –> sweat upon gustatory stimulation. Redness, flush, and sweating on cheek near the ear
What are the 5 layers of the scalp?
Skin Connective tissue (dense) Aponeurosis Loose connective tissue Periosteum
Why does profuse bleeding of the scalp occur?
Blood vessels are attached to fibrous CT (layer 2). Attachment prevents vasospasm and causes lumen to remain open resulting in profuse bleeding.
What major n. and vessels would need to be avoided when removing the parotid gland?
CN VII, retromandibular v., external carotid a., auriculotemporal nerve (V3)
Why is pain in the parotid gland more intense prior to meal times?
Parotid increases in size as cells store their secretory granules. Released by parasympathetic stimulation during mastication.
Where would you expect to find a lesion in CN VII of a patient who has paralysis of all facial muscles on R side but has normal parasympathetic function?
Within the trunk of CN VII between stylomastoid foramen and the parotid gland
Why would a scalp laceration over the parietal bone cause black eyes?
Bleeding into the areolar space of the scalp under the parietal region and subsequent accumulation inferior to frontal is insertion. Gravity will pull the blood down into the periorbital region.
Why would a physician put a local anesthetic into the subq tissue above the right supraorbital notch to suture a scalp laceration over the right parietal bone just ant. to the vertex
To numb the right supraorbital nerve (V1) which supplies the scalp from the vertex to the supraorbital margin.
What layer of the scalp would contain a blood clot if the swelling were extensive but did not pass inferiorly beyond the temporal lines laterally, the orbital margin in front, and the nuchal lines behind?
Beneath the epicranial aponeurosis and limited only by the attachment of the aponeurosis to the skull
What layer of the scalp would contain a blood clot if the swelling were limited to the area occupied by an underlying skull bone
beneath the periosteum and limited by sutural ligaments
What layer of the scalp would contain a blood clot if the swelling were small, superficial, and with no fluctuation?
In the subq tissue and limited by fibrous tissue
