Oculoplasty Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Oculoplasty. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Oculoplasty Indian Medical PG Question 1: Most useful test to differentiate upper from lower motor neuron lesion?
- A. Deep tendon reflexes (Correct Answer)
- B. Muscle tone
- C. Hoffman sign
- D. EMG changes
Oculoplasty Explanation: ***Deep tendon reflexes***
- **Upper motor neuron (UMN)** lesions typically cause **hyperreflexia** due to loss of inhibitory input [1].
- **Lower motor neuron (LMN)** lesions typically result in **hyporeflexia or areflexia** due to damage to the reflex arc itself.
*Muscle tone*
- **UMN lesions** often lead to **spasticity** (velocity-dependent increase in tone) [2], [3].
- **LMN lesions** result in **flaccidity** or decreased tone due to loss of muscle innervation [1]. While helpful, reflex changes are more consistently discriminatory.
*Hoffman sign*
- The **Hoffman sign** is a pathological reflex used to detect **cervical myelopathy** or other **UMN dysfunction**, particularly in the upper limbs.
- Its presence indicates UMN involvement, but its absence does not definitively rule out a UMN lesion elsewhere or confirm an LMN lesion.
*EMG changes*
- **Electromyography (EMG)** can help differentiate UMN from LMN lesions by evaluating nerve and muscle activity, showing features like **fibrillation potentials** and **fasciculations** in LMN lesions [1].
- However, it is an investigative test, and clinically, deep tendon reflexes provide a rapid and often sufficient distinction at the bedside.
Oculoplasty Indian Medical PG Question 2: All of the following are methods to treat spastic entropion except:
- A. Quickert suture
- B. Eyelid taping
- C. Botox injection
- D. Wies marginal rotation (Correct Answer)
Oculoplasty Explanation: ***Wies marginal rotation***
- The Wies marginal rotation procedure is a surgical technique primarily used for the permanent correction of **involutional entropion**, involving horizontal eyelid shortening and rotation of the eyelid margin.
- While it can address severe entropion, it is generally considered a definitive surgical correction rather than a temporary or non-surgical method for spastic entropion, which might resolve spontaneously or with less invasive interventions.
*Quickert suture*
- The Quickert suture technique is a minimally invasive surgical procedure that uses sutures to evert the eyelid, providing a temporary or semi-permanent solution for entropion, including **spastic entropion**.
- It is commonly employed to stabilize the eyelid in cases of spastic entropion by tightening the lower eyelid retractors and reducing inward rotation.
*Eyelid taping*
- **Eyelid taping** is a non-invasive, temporary method used to manage spastic entropion by mechanically everting and holding the eyelid in the correct position.
- This technique is often used as a first-line treatment, especially for new-onset cases or in situations where definitive surgical treatment is delayed, to protect the cornea from irritation.
*Botox injection*
- **Botox (botulinum toxin type A) injections** are used to treat spastic entropion by temporarily paralyzing the preseptal orbicularis oculi muscle, which is responsible for the spasm and inward turning of the eyelid.
- This leads to relaxation of the muscle and eversion of the eyelid, effectively relieving the symptoms of spastic entropion for a limited period.
Oculoplasty Indian Medical PG Question 3: After an accident, a patient is unable to close her mouth completely due to certain facial injuries. Which muscle is paralyzed most commonly?
- A. Orbicularis oris (Correct Answer)
- B. Zygomaticus major
- C. Levator anguli oris
- D. Buccinators
Oculoplasty Explanation: ***Orbicularis oris***
- The **orbicularis oris** muscle forms a ring around the mouth and is primarily responsible for **closing and protruding the lips**, as well as other facial expressions involving the mouth.
- Injury leading to paralysis of this muscle would directly impair the ability to **close the mouth completely** and **seal the lips**.
*Zygomaticus major*
- The **zygomaticus major** muscle acts to pull the corners of the mouth **upward and laterally**, contributing to smiling.
- Its paralysis would affect the ability to smile effectively, but not directly impede the ability to close the mouth.
*Levator anguli oris*
- The **levator anguli oris** muscle elevates the corner of the mouth (angle of the mouth).
- Its dysfunction would impair the ability to raise the corner of the mouth, not the ability to completely close the mouth.
*Buccinators*
- The **buccinator** muscle is involved in pressing the cheek against the teeth, which helps in chewing, whistling, and sucking.
- Paralysis of the buccinator would primarily affect these actions, potentially causing food to pocket in the cheeks, but would not directly prevent mouth closure.
Oculoplasty Indian Medical PG Question 4: Which clinical sign can detect facial nerve palsy occurring due to the lesion at the outlet of stylomastoid foramen -
- A. Deviation of tongue towards opposite side
- B. Loss of sensation over right cheek
- C. Loss of taste sensation in anterior 2/3 of tongue
- D. Deviation of angle of mouth towards opposite side (Correct Answer)
Oculoplasty Explanation: ***Deviation of angle of mouth towards opposite side***
- A lesion of the facial nerve at the **stylomastoid foramen** specifically affects the motor innervation to the **muscles of facial expression**. [1]
- This leads to **paralysis of facial expression muscles** on the ipsilateral side, causing the mouth to **deviate towards the unaffected side** due to unopposed muscle action. [1]
*Deviation of tongue towards opposite side*
- **Tongue deviation** is primarily indicative of a lesion in the **hypoglossal nerve (CN XII)**, which controls the intrinsic and extrinsic muscles of the tongue.
- The facial nerve is not involved in **tongue movement**.
*Loss of sensation over right cheek*
- **Sensory innervation** to the face, including the cheek, is provided by the **trigeminal nerve (CN V)**, not the facial nerve.
- The facial nerve is primarily a **motor nerve** for facial expression, although it carries some sensory fibers for taste and a small area of the ear.
*Loss of taste sensation in anterior 2/3 of tongue*
- **Taste sensation** from the **anterior two-thirds of the tongue** is carried by the **chorda tympani nerve**, which is a branch of the facial nerve.
- However, the **chorda tympani branches off proximal to the stylomastoid foramen**, meaning a lesion at the foramen itself would not affect taste.
Oculoplasty Indian Medical PG Question 5: Which radiographic view is best for visualizing the frontal sinus?
- A. Caldwell's view (Correct Answer)
- B. Towne's view
- C. Schuller's view
- D. Water's view
Oculoplasty Explanation: ***Caldwell's view***
- This **posteroanterior (PA) radiographic projection** is optimized for visualizing the **frontal sinuses** and the **anterior ethmoid air cells**.
- The OML (orbitomeatal line) is positioned perpendicular to the image receptor, directing the central ray 15 degrees caudal from the posterior aspect of the skull, projecting the petrous ridges below the orbits.
*Towne's view*
- The **AP axial projection**, or Towne's view, is primarily used to visualize the **occipital bone**, **foramen magnum**, and the **condyles of the mandible**.
- It involves caudal angulation of the central ray to separate these structures.
*Schuller's view*
- Also known as the **lateral projection of the mastoid**, Schuller's view is primarily used to assess the **mastoid air cells** and the **external auditory canal**.
- It helps in evaluating mastoiditis or cholesteatoma.
*Water's view*
- This **parietoacanthial projection**, or Water's view, is best for visualizing the **maxillary sinuses**, and also provides good visualization of the **orbits** and **zygomatic arches**.
- The MML (mentomeatal line) is positioned perpendicular to the image receptor, projecting the petrous ridges below the maxillary sinuses.
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