Head — MCQs

Head Indian Medical PG Practice Questions and MCQs

Question 1211: Lateral movement is produced by anterior translation of one condyle producing rotation about the

A. Center in the opposite neck
B. Center in the opposite ramus
C. Center in the opposite condyle (Correct Answer)
D. Center in the opposite angle

Explanation: ***Center in the opposite condyle*** - **Lateral excursion** of the mandible involves the **working side condyle** rotating around a vertical axis, while the **non-working side condyle** translates anteriorly and medially (Bennett movement). - This anterior translation of the non-working condyle causes the entire mandible to pivot, with the center of rotation for the **lateral movement** being located roughly within the **condyle** on the **working (rotating)** side of the jaw. *Center in the opposite neck* - While the neck of the condyle is anatomically close to the condyle head, the **functional center of rotation** for lateral movement is typically described as being within the condyle itself, specifically its rotating component. - Positioning the center of rotation in the neck would imply a different biomechanical axis for the movement, which is not accurately reflected in standard mandibular kinematics. *Center in the opposite ramus* - The **ramus** is a broad part of the mandible, much larger than the condyle, and locating the center of rotation here would imply a much wider arc of movement, which is not consistent with the precise articulation of the **temporomandibular joint**. - The primary movements of the mandible during lateral excursion are centered on the condyle and its articular surfaces, not the entire ramus. *Center in the opposite angle* - The **angle of the mandible** is a distant anatomical landmark from the temporomandibular joint and is primarily involved in muscle attachments, not as a point of rotation for **lateral condylar movement**. - Placing the center of rotation at the angle would be biomechanically inaccurate for describing mandibular kinematics during lateral excursion.

Question 1212: Most common site of mandibular fracture is?

A. At the middle
B. At the neck of the condyle (Correct Answer)
C. Through the angle
D. Through the canine fossa

Explanation: ***At the neck of the condyle*** - The **condylar region** (including the neck of the condyle) is the **most common site** of mandibular fracture, accounting for approximately **30-36%** of all mandibular fractures. - This occurs due to the condyle being a **weak point** in the mandible and vulnerable to both **direct and indirect trauma** (such as a blow to the chin). - The condylar neck is particularly susceptible due to its **relatively thin cross-section** compared to other parts of the mandible. *Through the angle* - The **mandibular angle** is the **second most common** fracture site, accounting for 20-24% of cases. - While it is a common site due to stress concentration and the presence of third molars, it is less frequent than condylar fractures. *At the middle* - The **symphysis/parasymphysis** (midline region) accounts for 14-17% of fractures. - The thick cortical bone and buttressing effect provide relatively more resistance to fracture than the condylar region. *Through the canine fossa* - The **canine fossa** is located on the **maxilla, not the mandible**. - This is an anatomically incorrect option as it does not pertain to mandibular fractures.

Question 1213: On opening the mouth, if the jaw deviates to the right side, it indicates the paralysis of:

A. Right lateral pterygoid (Correct Answer)
B. Left medial pterygoid
C. Left lateral pterygoid
D. Right medial pterygoid

Explanation: Right lateral pterygoid - The **lateral pterygoid muscle** is primarily responsible for **protrusion** of the mandible and **depressing** the jaw during mouth opening. - When the right lateral pterygoid is paralyzed, the **intact left lateral pterygoid** pulls the mandible forward and toward the **opposite side** (the paralyzed right side), causing the jaw to **deviate to the right** upon opening. - This follows the principle: **"The jaw deviates toward the side of the paralyzed lateral pterygoid."** *Left medial pterygoid* - The **medial pterygoid muscle** primarily helps in **elevation** (closing) and **protrusion** of the mandible, as well as side-to-side movements, but is not a primary opener. - Paralysis of the left medial pterygoid would primarily affect jaw closing or specific side-to-side movements, not cause significant deviation to the right during opening. *Left lateral pterygoid* - If the **left lateral pterygoid** were paralyzed, the intact right lateral pterygoid would pull the jaw toward the paralyzed left side, causing deviation to the **left side** upon opening. - The jaw always deviates toward the side of the weakened or paralyzed lateral pterygoid muscle. *Right medial pterygoid* - Paralysis of the **right medial pterygoid** would mainly impair the **elevation** and **protrusion** of the right side of the mandible. - It would not cause the observed deviation to the right upon opening the mouth, as medial pterygoids are primarily jaw closers, not openers.

Question 1214: Hinge fracture is seen in

A. Posterior cranial fossa
B. Anterior cranial fossa
C. Middle cranial fossa (Correct Answer)
D. Vault

Explanation: ***Middle cranial fossa*** - A **hinge fracture** is a term sometimes used to describe a **linear skull fracture** that extends across the floor of the **middle cranial fossa**. - This type of fracture often involves the **temporal bone** and can lead to damage to structures within, such as the facial nerve or auditory ossicles. *Posterior cranial fossa* - Fractures in the **posterior cranial fossa** are usually related to trauma to the back of the head. - While they can be severe and involve the occipital bone, they are not typically referred to as hinge fractures. *Anterior cranial fossa* - Fractures of the **anterior cranial fossa** commonly involve the frontal bone, ethmoid bone, or sphenoid bone. - These fractures can cause **CSF rhinorrhea** or periorbital ecchymosis (raccoon eyes), but the term hinge fracture is not associated with this location. *Vault* - Fractures of the **cranial vault** typically refer to fractures of the flat bones forming the top and sides of the skull. - These can be linear, depressed, or comminuted, but the characteristic "hinge" description specifically applies to the base of the skull, particularly the middle fossa.

Question 1215: Arterial supply of tonsil is mainly:

A. Internal carotid artery
B. Maxillary artery
C. Middle meningeal artery
D. Tonsillar branch of facial artery (Correct Answer)

Explanation: ***Tonsillar branch of facial artery*** - The **tonsillar branch of the facial artery** is the primary arterial supply to the palatine tonsils. - This artery provides the main blood flow, especially to the lower pole of the tonsil, and is often the source of significant bleeding during **tonsillectomy**. *Internal carotid artery* - The **internal carotid artery** supplies structures within the cranial cavity, such as the brain and eyes, and does not directly supply the tonsils. - It does not have branches that directly supply the pharyngeal structures like the tonsil. *Maxillary artery* - The **maxillary artery** is a terminal branch of the external carotid artery, supplying deep structures of the face, nasal cavity, and teeth. - While it has branches to surrounding areas, it does not directly provide the primary blood supply to the tonsils. *Middle meningeal artery* - The **middle meningeal artery** is a branch of the maxillary artery that supplies the dura mater and bones of the skull. - It plays no role in the direct arterial supply of the tonsils.

Question 1216: What is the anatomical relation of the upper lacrimal punctum with respect to the lower punctum?

A. Lateral
B. Superior (Correct Answer)
C. No relation
D. Apposed

Explanation: ***Superior*** - The **upper lacrimal punctum** is located slightly **superior** to the lower lacrimal punctum, which is the predominant anatomical relationship. - Additionally, the upper punctum is positioned slightly **lateral** (approximately 0.5-1mm) to the lower punctum, though the superior relationship is more clinically significant. - This arrangement facilitates efficient tear drainage into the lacrimal canaliculi and ultimately to the nasolacrimal duct. *Lateral* - While there is a slight **lateral offset** between the upper and lower puncta, this is not the primary or most significant anatomical relationship. - The **superior-inferior relationship** is the dominant spatial arrangement and is more relevant for clinical examination and cannulation procedures. *No relation* - The upper and lower lacrimal puncta have a precise anatomical relationship as paired openings into the **lacrimal canaliculi**. - They work together as part of the tear drainage system, positioned at the medial aspects of their respective eyelid margins. *Apposed* - The term **apposed** means being in direct contact or immediately adjacent, which does not describe the relationship between the puncta. - They are separated by the medial canthal area and located on different eyelid margins (upper vs. lower), not in direct apposition.

Question 1217: Müller's muscle is found in ?

A. Middle ear
B. Tongue
C. Pharynx
D. Eye lid (Correct Answer)

Explanation: Eye lid - Müller's muscle, also known as the **superior tarsal muscle**, is a smooth muscle in the **upper eyelid** that helps maintain eyelid elevation. - It receives **sympathetic innervation**; damage to its innervation can lead to **ptosis**, a characteristic of **Horner's syndrome**. *Middle ear* - The middle ear contains the **ossicles** (malleus, incus, stapes) and associated muscles like the **tensor tympani** and **stapedius**, but not Müller's muscle. - These muscles primarily function in **hearing protection** and sound transmission, not eyelid movement. *Tongue* - The tongue is composed of **intrinsic** and **extrinsic muscles** (e.g., genioglossus, styloglossus, palatoglossus, hyoglossus) responsible for speech, swallowing, and taste. - There is no muscle named Müller's muscle associated with the tongue. *Pharynx* - The pharynx contains **constrictor muscles** and **longitudinal muscles** (e.g., stylopharyngeus, palatopharyngeus, salpingopharyngeus) involved in swallowing. - None of these muscles are referred to as Müller's muscle.

Question 1218: Volume of the orbit is

A. 100ml
B. 60ml
C. 120ml
D. 25ml (Correct Answer)

Explanation: ***25ml*** - The average volume of the adult **orbit** is approximately **25 cubic centimeters (ml)** [1]. - This volume accommodates the eyeball, extraocular muscles, nerves, vessels, and orbital fat [1],[2]. *100ml* - This volume is significantly **larger** than the typical orbital volume. - An orbital volume of 100ml would represent a severe pathological condition, likely involving a large mass or significant edema. *60ml* - While closer than 100ml, **60ml is still more than double** the average orbital volume. - Such a volume would be indicative of **proptosis** or other orbital pathology. *120ml* - This volume is substantially **excessive** for the normal human orbit. - Such a large volume would likely be associated with extreme **orbital expansion** due to a tumor or other space-occupying lesion.

Question 1219: In carcinoma of the base of the tongue pain is referred to the ear through:

A. Lingual nerve
B. Hypoglossal nerve
C. Glossopharyngeal nerve (Correct Answer)
D. Vagus nerve

Explanation: ***Glossopharyngeal nerve*** - The **glossopharyngeal nerve (CN IX)** supplies sensory innervation to the base of the tongue, tonsils, and pharynx. - Referred pain to the ear from these regions occurs because the **tympanic branch of CN IX (Jacobson's nerve)** innervates the middle ear and shares sensory pathways with other branches of the glossopharyngeal nerve. *Lingual nerve* - The **lingual nerve**, a branch of the mandibular nerve (CN V3), provides general sensation and taste to the **anterior two-thirds of the tongue**. - Its sensory distribution does not extend to the base of the tongue or the ear for referred pain from this specific location. *Hypoglossal nerve* - The **hypoglossal nerve (CN XII)** is primarily a **motor nerve** responsible for the movement of the intrinsic and extrinsic muscles of the tongue. - It does not carry sensory fibers for pain from the base of the tongue or referred pain to the ear. *Vagus nerve* - The **vagus nerve (CN X)** provides sensory innervation to parts of the **larynx, pharynx, and external auditory canal**. - While it can be involved in referred otalgia from the larynx, the primary pathway for referred otalgia from the base of the tongue is the glossopharyngeal nerve.

Question 1220: The muscular floor of the mouth (oral diaphragm) is formed by -

A. Hyoglossus
B. Genioglossus
C. Mylohyoid (Correct Answer)
D. Buccinator

Explanation: ***Mylohyoid*** - The **mylohyoid muscle** forms the muscular floor of the mouth, acting as a diaphragm that supports the tongue and aids in swallowing. - It extends from the **mandible** to the **hyoid bone** and the median fibrous raphe. *Hyoglossus* - The **hyoglossus** is a muscle of the tongue, originating from the hyoid bone and inserting into the tongue. - Its primary function is to **depress and retract the tongue**, not to form the floor of the mouth. *Genioglossus* - The **genioglossus** is the largest and arguably most important extrinsic muscle of the tongue, originating from the mandible. - It primarily functions to **protrude the tongue** and depress its central part, but does not form the oral diaphragm. *Buccinator* - The **buccinator muscle** forms the muscular wall of the cheek, not the floor of the mouth. - Its main roles are in **mastication** (holding food against the teeth) and **facial expression** (such as smiling or whistling).

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