AIIMS MDS ENTRANCE EXAM PAST QUESTIONS NOV 2001

 

AIIMS MDS ENTRANCE EXAM PAST QUESTIONS NOV 2001 by Raman Dhungel on Scribd

Floor of nasal cavity is formed by:

 # Floor of nasal cavity is formed by:

A. Palatine process of maxilla and horizontal part of palatine bone

B. Palatine process of maxilla and vertical part of palatine bone

C. Maxillary process of palatine and horizontal part of maxilla

D. Maxillary process of palatine and vertical part of maxilla

The correct answer is A. Palatine process of maxilla and horizontal part of palatine bone.

The nasal cavities contain: 

Respiratory area: 

The respiratory area is lined by a pseudostratified , ciliated, columnar epithelium. The epithelium contains goblet cells and a subjacent fibrous lamina propria with mixed mucous and serous glands. The Lateral walls contain conchae, which increase the surface area and promote warming of the inspired air. 

Olfactory area:

The olfactory area is located in the posterosuperior nasal cavity and is lined by a pseudostratified epithelium composed of bipolar neurons (olfactory cells), supporting cells, brush cells, and basal cells. The basal cells are stem cells that continuously turn over to replace the olfactory receptor cells. This is the only example in the adult human where neurons are replaced. Under the epithelium, Bowman glands produce serous fluid which dissolves odorous substances. 

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Oral diaphragm is formed by:

 # Oral diaphragm is formed by:

A. Mylohyoid muscle

B. Genioglossus muscle

C. Buccinator muscle

D. Orbicularis oris muscle

The correct answer is A. Mylohyoid muscle.

The mylohyoid muscle or diaphragma oris is a paired muscle running from the mandible to the hyoid bone, forming the floor of the oral cavity of the mouth.

The mylohyoid muscle is flat and triangular, and is situated immediately superior to the anterior belly of the digastric muscle. It is a pharyngeal muscle (derived from the first pharyngeal arch) and classified as one of the suprahyoid muscles. Together, the paired mylohyoid muscles form a muscular floor for the oral cavity of the mouth.

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The action of digastric muscle is:

 # The action of digastric muscle is:

A. Depression of mandible

B. Protrusion of mandible

C. Side to side movement of the mandible

D. Depressing the floor of the mouth

The correct answer is A. Depression of mandible.

The digastric muscle is involved in any complex jaw action such as speaking, swallowing, chewing and breathing.

When the digastric muscle contracts, it acts to elevate the hyoid bone.

If the hyoid is being held in place (by the infrahyoid muscles), it will tend to depress the mandible (open the mouth).

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