Dentosphere : World of Dentistry

Wounds of the scalp bleed continuously

# The wounds of the scalp bleed continuously because:

A. Scalp is highly vascular

B. Blood vessels lie just beneath the skin

C. Wounds gape

D. Vessel walls fail to retract

The correct answer is D. Vessel walls fail to retract.

The blood vessels of the scalp are embedded in the dense connective tissue (subcutaneous fibroadipose tissue) layer and their walls are adherent to its fibrous network.

Therefore, when the vessels are torn in an open wound, they are unable to retract. This results in continuous bleeding. The scalp lacerations even when small, can produce death in unconscious patient, if bleeding is not controlled.

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Natural drainage of maxillary air sinus

# The natural drainage of maxillary air sinus is impeded because:

A. Its opening into the middle meatus is narrow

B. Of its large size

C. Placement of its opening is higher than its floor

D. Its base is directed towards the lateral wall of the nasal cavity

The correct answer is C. Placement of its opening is higher than its floor.

The maxillary sinus is the one most commonly involved in infection of nasal cavity. This is probably because its aperture is located superior to its floor, impeding its natural drainage.

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Ganglion associated with oculomotor nerve

# The ganglion which is associated with the oculomotor nerve is:

A. Optic ganglion

B. Ciliary ganglion

C. Superior cervical ganglion

D. None of the above

The correct answer is B. Ciliary ganglion.

Ciliary ganglion is associated with the III nerve, lies between the lateral rectus and the optic nerve. It receives preganglionic sensory parasympathetic fibres from III nerve and sympathetic fibres from superior cervical ganglion. It supplies parasympathetic fibres to constrictor pupillae and sympathetic fibres to dilator pupillae. Otic ganglion is related to glossopharyngeal nerve.

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