Modiolus around the corner of mouth is formed by all EXCEPT:

 # Modiolus around the corner of mouth is formed by all EXCEPT:

A. Orbicularis oris

B. Buccinator

C. Risorius

D. Mentalis

The correct answer is: D. Mentalis.

The modiolus is a chiasma of facial muscles held together by fibrous tissue, located lateral and slightly superior to each angle of the mouth. It is contributed to by the following muscles: Orbicularis oris, Buccinator, levator anguli oris, depressor anguli oris, zygomaticus major, risorius, quadratus labii superioris, quadratus labii inferioris. 

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Which of the following bone is not pneumatic?

 # Which of the following bone is not pneumatic?

A. Mandible

B. Frontal 

C. Mastoid

D. Ethmoid

The correct answer is A. Mandible.

Any bone, which contains air spaces within its body is called as pneumatic bone. Maxillary, frontal, ethmoid, mastoid, sphenoid bone, etc. all are ethmoid bones.

Mandible is not a pneumatic bone.

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Danger layer of Scalp is:

 # Danger layer of scalp is:

A. Periosteum

B. Connective tissue

C. Loose areolar tissue

D. Aponeurosis

The correct answer is C. Loose areolar tissue.

Danger area of scalp:

- Loose areolar tissue contains the emissary veins and is termed as dangerous area of scalp because it allows spread of infection even, by the way of emissary veins, to cavernous sinus.

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Remineralization of tooth surface is associated with which component of saliva?

# Remineralization of tooth surface is associated with which component of saliva?

A. Amylase

B. Statherin

C. Crystatins

D. Streapsinase

The correct answer is B. Statherin

Two of the families of small salivary proteins histadine and statherin help control the status of calcium and phosphorus in the saliva.

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