Boards Flashcards
Blood supply of tympanic membrane
Lateral aspect is from circumferential and manubrial branches of the deep auricular branch of the maxillary artery
Innervation of cornea
Ophthalmic division of trigeminal nerve
Most common site of chronic sinusitis
Maxillary most common
Ethmoid
Frontal
Sphenoid least common
Course of facial nerve
Motor part Arises from facial nerve nucleus in pons
Sensory and parasympathetic parts from nervus intermedius
Both enter PETROUS TEMPORAL BONE via INTERNAL AUDITORY MEATUS, emerges from STYLOMASTOID FORAMEN and passes through PAROTID GLAND where it divides into 5 major branches
Narrowest portion of trachea
Subglottis in infants and children
LARYNX in adults
Normal thyroid weight
10 to 30 grams
Normal cystic duct diameter
1-5 mm
Metastasis of papillary thyroid cancer
Lymph nodes
Lung (snowflake appearance)
Muscle that ABDUCTS vocal cords
Cricoarytenoid
Blood supply of sinoatrial node
Right coronary artery
Location of SA node
Submyocardial at lateral aspect of junction of SVC and R atrium
Site of injection for intercostal nerve block
Angle of the rib, 7cm lateral to midline. Intercostal space, midway between dermatomes to be blocked
Gastrointestinal Stromal Tumors (GIST) arise from what layer
Interstitial cells of cajal between muscular layers of GI tract (myenteric plexus?)
What is the pringle maneuver?
Often used in liver surgery to minimize blood loss.
Haemostat is used to clamp the hepatoduodenal ligamentinterrupting blood flow through the hepatic artery and portal vein should bleeding continue, it is likely that the IVC or hepatic vein were also traumatized
What is Sengstaken-Blakemore
Tube inserted through nose or mouth to manage UGIB due to esophageal varices