Grays Flashcards
A woman has thyroid tumor surgery, but 24 hrs later starts aspirating fluid into her lungs. The area of the piriform recess above the vocal fold of the larynx was anesthetized. What nerve was most likely iatrogenically injured?
- External branch of the superior pharyngeal
- Hypoglossal
- internal branch of the superior laryngeal
- Lingual
- Recurrent laryngeal
Internal branch of the superior laryngeal
Results in loss of sensation above the vocal cords and loss of taste on teh epigottis; loss of sensation in the laryngeal vestibule precipitates aspiration of fluid into the larynx, trachea, and lungs
Air bubbles on a CT of her brain after thyroidectomy. What caused it?
- Injury to inferior thyroid artery
- Injury to inferior an dupserior thyroid arteries
- Injury to superior thyroid artery and vein
- Injury to superior an dmiddle thyroid veins
- Injury to superior, middle, and inferior thyroid veins
Injury to superior an dmidle thyroid veins
The superior thyroid vein is from the internal jugular vein and accompanies the superior thyroid artery .The middle thyroid vein is also from the internal jugular vein. Both can be torn in thyroid surgery, admitting an airbubble (due to negative pressure in veins) that can ascend in the internal jugular vein up to the skull.
What would we expect with injury to the left external laryngeal nerve?
- Inability to abduct the vocal fold
- Monotone, easily fatigued voice with poor pitch control
- Decreased/absent sensation above the vocal cord
- Decreased/absent sensation below the vocal folds
- Decreased/absent cough reflex
Monotone, easily fatigued voice with poor pitch control
The external laryngeal nerve is motor only; it supplies the cricothyroid muscle, which tenses the vocal cords.
She can’t abduct her righ teye. Where would an aneurysym most likely be located to cause the nerve compression resulting in the symptoms/signs?
- PCA
- ICA
- External carotid artery
- Anterior cerebtral artery
- Posterior communicating artery
Internal carotid artery is the main blood supply to the brain. It has several parts. It runs with the abducens nerve through the cavernous sinuses
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A man got in a car crash. “Step off” defects were palpated over the root o th nose and teh glabella. There was also clear fluid draining from the nasal cavity. There was a fracture in th emiddle region fo the anterior cranial fossa. What else does the patient probably have?
- Blurred vision
- Diplopia
- Anosmia
- Blindness
- Dry left eye
Anosmia (loss of smell).
Leakage of CSF occurs with fractured cribiform plate, which will also damage the olfactory n. If the orbital rim is involved in the fracture, the patient has palpable bony ‘step off’ and complains of pain when palpating there. Anterior cranial fossa fractures often include CSF rhinorrhea and bruising around eyes.
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Woman suddenly has vision problems. There’s an aneurysm in one of the arteries at the base of the brain, compressing the optic chiasm. Which artery was most likely involved?
- Middle cerebral
- Anterior communicating
- Anterior cerebral
- Superior cerebellar
- Posterior superior cerebellar
Anterior communicating
The anterior communicating artery is right behind the optic chiasm
A boy has severe acne, a fever, confused mental state, and drowsiness. He has cavernous sinus thrombosis. Which of the following routes of entry to the cavernous sinus would most likely be responsible for the infection?
- Carotid artery
- Mastoid emissary vein
- Middle meningeal artery
- Ophthalmic vein
- Parietal emissary vein
The superior ophthalmic vein provides a more direct route to the cavernous sinus; it receives blood from veins that supply the area around the nose and lower forehead.
The emissary veins communicate between the venous sinuses and the veins of the scalp.
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A man has a fracture through the crista galli on the anterior cranial fossa, resulting in slow, local bleeding. Which is most likely the source of bleeding?
- Middle meningeal artery
- Great cerebral vein of GAlen
- Sueprior sagittal sinus
- Straight sinus
- Superior ophthalmic vein
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Superior sagittal sinus attaches anteriorly to the crista galli; bleeds slow.
Middle meningeal is near the pterion on the temporal aspect of the skull and would bleed profusely. The great cerebral vein and straight sinus are both posterior. The superior ophthalmic vein is inferior to the crista galli as it drains the orbit to the cavernous sinus.
Diplopia when walking down stairs (moving pupil downward and laterally)
Problem with the trochlear nerve, which innervates the superior oblique muscle to look downward and laterally
A woman has tenderness in the thorax, painful to compression. She has slight ptosis of her right eyelid and the right pupil is constricted more than the other.
- Raynaud’s disease
- Frey’s syndrome
- Bell’s palsy
- Quinsy
- Pancoast tumor
Pancoast tumor in the pulmonary apex affects teh sympathetic chain ganglia –> Horner’s (slight ptosis and miosis)
A boy had a mastoidectomy and post-op had Bell’s palsy, accumulation of saliva in the vestibula of his oral cavity, and dribble from the corner of his mouth. What was most likely paralyzed?
- Zygomaticus major
- Orbicularis oculi
- Buccinator
- Levator palpebrae superioris
- Orbicularis oris
Buccinator muscle usually prevents accumulation of saliva and food in the oralvestibule
The dilator pupillae muscle, the smooth muscle cell fibers of the superior tarsal muscle (of Muller, part of levator palpebrae superioris), and the smooth muscle cells of the blood vessels of the ciliary body are suppplied by efferent nerve fibers. Which of the following structures contains the neural cell bodies of these fibers?
- Pterygopalatine ganglion
- IML nucleus (lateral horn) C1-4
- Geniculate ganglion
- Nucleus solitarius
- Superior cervical ganglion
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The postsynpatic cell bodies of the sympathetic neurons that innervate these structures are in the superior cervical ganglion
The IML contains presynaptic sympathetic neurons, but only at T1-L2. The other options don’t have sympathetic cell bodies.
Serious pain between lower eyelid an dupper lip. To reach the nerve causing this, th eneedle will most likely need to be inserted through..
- Foramen ovale
- Foramen spinosum
- Infraorbital foramen
- Mandibular foramen
- Foramen magnum
Infraorbital foramen - this is a maxillary nerve problem, whose infraorbital branch exits the skull below the orbit through this foramen. Then, you can reach the foramen rotundum.
Patient has a black eye from a street fight. What nerve should you target for anesthetic?
- Ophthalmic
- Infraorbital
- Anterior ethmoidal
- Frontal
- Optic
Ophthalmic nerve because it can then infiltrate its branches, including the nasociliary branch –> anesthesia of the area
Pain from the region of the parotid gland (such as in mumps) is due to what nerve?
Auriculotemporal nerve
In Eagle’s syndrome, the styloid process and stylohyoid ligament are elongated and calcified. Which nerve is most likely affected by the Eagle’s syndrome?
Vagus
Facial
Glossopharyngeal
Hypoglossal
Vestibulocochlear
The facial nerve innervates the stylohyoid muscle, but it’s the glossopharyngeal nerve that enters the posterior orpharynx by coursing between the stylohyoid ligament and the stylopharyngeus muscle.
Sometimes cardiac pain is referred to the mandible and the region fo the temporomandibular joint. Cutaneous sensation over the angle of the mandible is normally supplied by which of the following nerves?
- Cervical branch of facial
- Great auricular nerve
- Mandibular branch of trigeminal nerve
- Mandibular branch of facial nerve
- Transverse cervical nerve
Great auricular nerve (from rami of C2-3) supplies the angle of the mandible up to the TMJ
What is the only intrinsic muscle of the tongue that the hypoglossal n doesn’t innervate?
Palatoglossus
A tumor close to the external acoustic meatus might result in..
- contrlateral deviation of the uvula during elevation of the soft palate
- ipsilaterla deviation on protraction of the tongue
- ipsilateral pupillary constriction and partial ptosis
- ipsilateral weakness in elevation of the mandible
- ipsilateral weakness in tight closure of the eyelids
ipsilateral weakness in tight closure of the eyelids
The tumor can compress the facial nerve as it exits teh stylomastoid foramen, which is responsible for the tight closure of the eyelids.
A woman has swelling and pain over the left side of her face. There is tender, warm swelling over the lef tmandibel anterior to the ear. There’s a hyperechoic mass within the lumen of the parotid duct, which was distended. What else is likely present?
- Weak deviation of the mandibel to teh right
- Complete ptosis of the left eyelid
- Numbness of the skin over the left lower mandible
- Excesssive tearing
- Pain over the naterior auricle, tragus, and anterior helix
Pain over the anterior auricle, tragus, and anterior helix
Nerves passing through the distended parotid gland are affected. This includes the facial nerve, but also the auriculotemporal nerve, which gives rise to this pain.
Laceration to teh left cheek and jaw. Glass is lodged between the two heads of the lateral pterygoid muscle. What else is most likely found in this patient?
- Weak elevation of the jaw
- Weak deviation of the jaw to the right side
- Numbness over the skin of the tragusand helix of the left ear
- Numbness over the skin and mucosa of the anterior cheek
- Decreased volume of saliva
Numbness over the skin and mucosa of the anterior cheek
The nerves involved are the lingual and bucal nerves, which are branches of V3. They provide sensation tot eh mucosa ofthe anterior 2/3 of tongue, adjacent gums, cheek mucosa, and overlying skin.
“Danger zone” of the scalp- where is it and how is it dangerous?
In the loose connective tissue, because that’s where all the veins are.
Allows scalp infection to to be transmitted into the skull via emissary veins , then via diploic veins of the bone to the cranial cavity.
(SCALP, outer to inner- skin, connective tissue, aponeurosis, loose connective tissue, periosteum)