3.5 POJA-L137. Late cap stage of tooth development

3.5 POJA-L143. Late cap stage in tooth development

​3.5  POJA-L137  

Title: Late cap stage of tooth development

Description:
Stain Azan, human embryo.  From top to bottom:
-  Stratified ectoderm with a distinct basal layer of cuboid cells.
-  Dental lamina giving rise to the cap stage (centre) and to the                 primordium  of permanent tooth (obliquely upward).                             
-  Odontogenic organ or enamel organ (future deciduous tooth             surrounded by fibrous tooth follicle.                          
-  Outer dental epithelium encloses the stellate reticulum                           consisting of a network of ectoderm-derived cells.
-  Inner dental epithelium is seen as a dark red zone of future                     ameloblasts covered by a few cell layers of the stratum                             intermedium.
-  Future odontoblasts are localized just below the translucent zone     close to the ameloblasts.
-  Dental papilla extends outside the cervical loop; it consists of a           compact network of fibroblast-like cells (so-called pulpal cells).
-  Blood vessels of the papilla and tooth follicle are present.
-  At the bottom alveolar bone formation (dark blue).

​3.5  POJA-L143  

Title: Late cap stage in tooth development

Description:
Stain Azan, human  embryo. The stellate reticulum (enamel pulp) consists of a network of  ectoderm- derived branched cells and fluid-filled spaces (a.o. proteoglycans). It is a specialized avascular layer as a support and protection for the inner dental epithelial cells. At the right side one layer of cuboidal outer dental epithelium is covered by fibroblasts of the fibrous tooth follicle.    ​

​Keywords/Mesh: oral cavity, mouth, oral cavity, tooth development, dental epithelium,  dental lamina, odontoblast, ameloblast, stellate reticulum, outer dental epithelium, cervical loop , histology, embryology, POJA collection

3.5 POJA-L142. Late cap stage in tooth development

3.5 Poja-L145. Cervical loop in tooth development (late cap stage)

3.5  POJA-L142 

Title: Late cap stage in tooth development

Description:
Stain Azan, human, embryo.  From top to bottom:
-  Top side stellate reticulum (enamel pulp) consisting of a network       of  ectoderm-derived cells.
-  Right side outer dental epithelium with part of the fibrous tooth         follicle. This epithelium will further develop downwards as the           outer layer of the Hertwig’s epithelial root sheath.
-  Darker stained cell layers of the stratum intermedium close to             the stellate reticulum.
-  Columnar inner dental epithelium (presecretory ameloblasts) at       the distal side (secretion area) delimits by basement membrane         from the dental papilla.
-  Network of mesenchyme-derived cells of the dental papilla                   (future pulp) is more condensed close to the basement                             membrane. 


​3.5  POJA-L145 

Title: Cervical loop in tooth development (late cap stage)

Description:
Stain Azan,  human, embryo. From left to right:
-  Dental papilla.
-  Thin basement membrane.
-  Columnar inner dental epithelium (presecretory ameloblasts).
-  Stellate reticulum.
-  Cuboidal outer dental epithelium.
-  Fibrous tooth follicle.  
-  Note the transition from inner to outer dental epithelium                       (cervical loop).
 
                              

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