Q-91. Acoustic neuroma commonly arises from
a) Superior division of vestibular nerve
b) Inferior division of vestibular nerve
c) Cochlear nerve
d) VIIth cranial nerve
Answer: Inferior division of vestibular nerve
Explanation:
Acoustic neuroma is also known as vestibular schwannoma, Neurilemmoma or eighth nerve tumor.
Acoustic neuroma constitutes 80 % of all Cerebello-pontine angle tumors.
Cochleovestibular symptoms are the earliest symptoms.
Progressive unilateral sensorineural hearing loss, often accompanied by tinnitus is the presenting symptoms in majority of cases.
Vth cranial nerve is the earliest nerve to be involved.
Important point:
The acoustic neuroma arises most commonly from the inferior division of the vestibular nerve and next most commonly from the superior division.
In rare cases, it arises from cochlear division of eighth nerve.
Q-92. Most common site for CSF rhinorrhoea
a) Ethmoid sinus
b) Frontal sinus
c) Sphenoid sinus
d) Tegmen tympani
Answer: Ethmoid sinus
Explanation:
Posttraumatic CSF leaks account for nearly 90% of all cases.
The most common sites of injury involve the anterior cranial fossa, with fractures through the cribriform plates of the ethmoid bones, ethmoid air cells or frontal sinus.
CSF from middle cranial fossa: Sphenoid sinus
Q-93. Middle superior alveolar nerve is a branch of
a) Infra-orbital branch of maxillary nerve
b) Nasal branch of maxillary nerve
c) Mandibular branch of trigeminal nerve
d) Inferior alveolar
Answer: Infra-orbital branch of maxillary nerve
Explanation:
The middle superior alveolar nerve is a branch of the infra-orbital portion of the maxillary nerve.
Q-94. Endolymph is secreted by
a) Stria vascularis
b) Basilar membrane
c) Cochlear duct
d) Hensen’s cell
Answer: Stria vascularis
Explanation:
Endolymph fills the entire membranous labyrinth and resembles intra-cellular fluid, being rich in K ions.
It is secreted by the secretory cells of the stria vascularis of the cochlea and by the dark cells present in the utricle and also near the ampullated ends of semicircular ducts.
Q-95. Car-hart’s notch is found is
a) Otospongiosis
b) CSOM
c) Meniere’s disease
d) Acoustic neuroma
Answer: Otospongiosis
Explanation:
Otosclerosis (Syn. Otospongiosis):
It is an autosomal dominant trait with incomplete penetrance and a variable expressivity.
Stapedial otosclerosis causing stapes fixation and conductive deafness is the most common variety. Here lesion starts just in front of the oval window in an area called fissula ante fenestrum.
Car-hart’s notch is seen in otosclerosis. Bone conduction curve shows maximum loss at 2000 Hz.
Car-hart’s notch disappears after successful stapedectomy.
Important point:
The triad of symptoms of osteogenesis imperfecta, otosclerosis and blue sclera is called van der Hoeve syndrome.
Q-96. The abductor of vocal cords is
a) Lateral crico-arytenoid
b) Posterior crico-arytenoid
c) Anterior crico-arytenoid
d) Cricothyroid
Answer: Posterior crico-arytenoid
Explanation:
Abductors of vocal cord: Posterior crico-arytenoid
Adductors of vocal cord:
Lateral crico-arytenoid
Inter-arytenoid (Transverse arytenoid)
Thyro-arytenoid (External part)
Tensors: Cricothyroid and vocalis (Internal part of Thyro-arytenoid)
Q-97. Septal perforation is not seen in
a) Septal abscess
b) Leprosy
c) Rhinophyma
d) Trauma
Answer: Rhinophyma
Explanation:
Septal perforation:
Trauma (Trauma)
Septal abscess
Nasal myiasis
Chronic granulomatous conditions like lupus, tuberculous and leprosy (Perforation in the cartilaginous part; and syphlis (Perforation in the bony part)
Rhinolith or neglected foreign body
Prolonged use of steroid spray
Cocaine addicts
Workers in certain occupation (Chromium plating, dichromate, soda ash, arsenic)
Q-98. Commonest complication of CSMO is
a) Bezold’s abscess
b) Mastoiditis
c) Brain abscess
d) Meningitis
Answer: Mastoiditis
Explanation:
Sub-periosteal abscess, also referred to as acute mastoiditis, is the most common complication of CSOM and can occur with or without the presence of a cholesteatoma.
Meningitis is the most common intracranial complication of acute and chronic otitis media.
Q-99. Delphic nodes are
a) Pre-tracheal
b) Para-tracheal
c) Supra-clavicular
d) Posterior triangle
Answer: Pre-tracheal
Explanation:
The Delphic nodes are enlarged pre-laryngeal and pre-tracheal nodes.
The Delphic lymph node is the first lymph node involved in carcinoma thyroid.
Q-100. Acoustic neuroma arises most commonly from
a) Inferior division of vestibular nerve
b) Superior division of vestibular nerve
c) Cochlear nerve
d) Facial nerve
Answer: Inferior division of vestibular nerve
Explanation:
Acoustic neuroma is also known as vestibular schwannoma, Neurilemmoma or eighth nerve tumor.
Acoustic neuroma constitutes 80 % of all Cerebello-pontine angle tumors.
Cochleovestibular symptoms are the earliest symptoms.
Progressive unilateral sensorineural hearing loss, often accompanied by tinnitus is the presenting symptoms in majority of cases.
Vth cranial nerve is the earliest nerve to be involved.
Important point:
The acoustic neuroma arises most commonly from the inferior division of the vestibular nerve and next most commonly from the superior division.
In rare cases, it arises from cochlear division of eighth nerve.