515. An abrasion results in the total loss of epidermis over a large area of an arm, but one month later, the abrasion has healed, with regrowth of the epidermis. Which of the following mechanisms accounts for the restoration of the epidermis over the abraded area?

 A.  Growth of epidermis from hair follicles and sweat glands in the dermis
 B.  Migration of endothelial cells from newly grown capillaries
 C.  Transformation of dermal fibroblasts into epidermal cells
 D.  Transformation of macrophages into epidermal cells
 E.  Transformation of melanocytes into epidermal cells

514.Papillary carcinomas spread by the route of

a.Lymphatics
b.Hematogenous
c.Direct
d.All

Ans-a.Lymphatics

Follicular carcinoma spreads via hematogenous route.Medullary and papillary carcinoma spreads via lymphatics and anaplastic has a direct spread

513.All structures are preseved in radical neck surgery except

a.Carotid arteries
b.Cranial nerves 7,9,10
c.Phrenic nerve
d.Accessory nerve

Ans-d.Accessory nerve