Oral Histology

Intracellular collagen vacoules are seen in	Fibroblasts. In fibroblasts that are resorbing collagen, such vacoules are seen
During tooth eruption, PDL fibroblasts express, cytokeratin	19
In PDL, the epithelial cell rests are most commonly found on	This is age dependent. In first two decades, cell rests are most commonly assoicated with apical region while from third decade they are intimately associated with cervically in gingiva
The specific type of capillaries in PDL is	Fenestrated capillaries. Fibrous connective tissue often have continous capillaries. In PDL this is fenestrated variant
The sensory nerve fibers of PDL govern	nociception and mechanoreception
The autonomic nerve fibers of PDL govern	blood supply of PDL
Cell bodies of PDL Mechanoreceptor neurons lie in	trigeminal ganglion and mesencephalic nucleus
Formation of neural crest cell is induced by	Chordamesoderm
Organizational plan of of head is mediated by	Chordamesoderm
Positional relationship of various neural plates is governed by	Chordamesoderm
Notochord and prechordal plate arise initially within	Endoderm
Well organized mesodermally derived cells, caudal to ear is called	Somites
Less organized mesodermally derived cells, roustral to ear is referred as	Somitomeres
Inductive interaction of ventral forebrain and oral ectoderm leads to formation of	Pitutary gland
Mesodermal core of each visceral arch is primarily concerned with	formation of vascular channels
Origin of connective tissue components of tongue	anterior two third from first arch mesenchyme while the posterior from third arch mesenchyme
Enamel septum	when the enamel cord extends to meet the outer enamel epithelium, it is enamel cord
Enamel navel	the small depression at the meeting point of enamel septum and outer enamel epithelium