The Health Education Assets Library (HEAL) is a collection of over 22,000 freely available digital materials for health sciences education. The collection is now housed at the University of Utah J. Willard Marriott Digital Library.
Filters: Collection: ehsl_heal
| Title | Description | Subject | Collection | ||
|---|---|---|---|---|---|
| 26 |
 |
Dentinoenamel junction in longitudinal section of tooth - human, adult. Thin ground section. | From left to right: enamel with fine striation (composed of stalks of enamel rods or prisms); enamel tufts (dark) arise at the dentinoenamel junction, and these tufts consist of hypocalcified enamel prisms and interprismatic substance; dentin with dentinal tubules up to the dentinoenamel. | oral cavity; enamel tufts; dentinoenamel junction; dentinal tubules | Poja Histology Collection - Oral Cavity Subset |
| 27 |
 |
Dentinoenamel junction in the tooth (human, adult). Thin ground section of crown. | From left to right: Enamel with fine striation (composition of enamel rods or prisms); darker zones almost perpendicular to the striation are the incremental lines (Retzius) due to successive apposition of layers of enamel as the crown is formed. Dentinoenamel junction is shown as a narrow fissure f... | oral cavity; dentinal tubules; dentinoenamel junction; interglobular dentin; lines of Retzius | Poja Histology Collection - Oral Cavity Subset |
| 28 |
 |
Dentinoenamel junction in the tooth - human, adult. Thin ground section of crown. | From left to right: Superficial dentin (bluish) in the crown with S-shaped course of dentinal tubules; They pass uninterrupted through the irregular black structures (due to filling with air) representing hypocalcified areas (interglobular dentin); Mineralization of dentin starts in small globular ... | oral cavity; dentinal tubules; dentinoenamel junction; interglobular dentin; lines of Retzius | Poja Histology Collection - Oral Cavity Subset |
| 29 |
 |
Dentinogenesis in tooth development - bell stage, gerbil, postnatal | Electronmicroscopy. At the top right corner side the distal cytoplasmic parts of presecretory ameloblasts resting on a thin grey basal lamina. In the central area predentin with collagen fibers (grey patches) and cross-sectioned small odontoblastic branches. In between them dispersed numerous dark-s... | oral cavity; predentin; matrix vesicles | Poja Histology Collection - Oral Cavity Subset |
| 30 |
 |
Dentinogenesis in tooth development - bell stage, gerbil, postnatal | Electronmicroscopy. At the bottom side of the predentin partly cross-sectioned odontoblasts with some organelles and many vesicular structures, the dark ones containing hydroxyapatite. Close to the odontoblasts a high concentration of secreted collagen fibers. Further away numerous matrix vesicles (... | oral cavity; predentin; matrix vesicles | Poja Histology Collection - Oral Cavity Subset |
| 31 |
 |
Early cap stage in tooth development - human, embryo | Stain: Azan. From top to bottom: stratified ectoderm with ingrowth of the dental lamina; knob-like end of the dental lamina; and collagen fibers of lamina propria are blue. | oral cavity; tooth development; dental lamina | Poja Histology Collection - Oral Cavity Subset |
| 32 |
 |
Early cap stage in tooth development - human, embryo; low magnification | Stain: Azan. From top to bottom: top left vestibular groove with gland formation; stratified ectoderm with dark red rim of basal cells from which a dental lamina sprouts downwards into the dental crypt (bony cavity) (bottom right corner); bone stains dark blue; connective tissue/mesenchym stains lig... | oral cavity; tooth development; dental lamina | Poja Histology Collection - Oral Cavity Subset |
| 33 |
 |
Early cap stage in tooth development - human, embryo; low magnification | Stain: Azan. From top to bottom: top left vestibular groove with gland formation; stratified ectoderm with ingrowth of the dental lamina (in the middle); bulbous growing end of dental lamina; bottom left alveolar bone formation (dark blue); and connective tissue/mesenchym stains light blue. | oral cavity; tooth development; dental lamina | Poja Histology Collection - Oral Cavity Subset |
| 34 |
 |
Enamel (odontogenic) organ in tooth development - bell stage, human, embryo | Stain: Azan. Outer surface of bell; from left to right: (avascular) Stellate reticulum; capillaries in this stage proliferate and invaginate between the outer dental epithelial cells; Part of fibrous tooth follicle. | oral cavity | Poja Histology Collection - Oral Cavity Subset |
| 35 |
 |
Enamel in longitudinal section of tooth - human, adult. Thin ground section, polarizing microscopy - optical axes of the polarizing plates are crossed at 60. | Using polarizing microscopy the birefringence of the crystalline structure of enamel is colorful demonstrated. Incremental lines (striae) of Retzius are well shown as straight oblique zones. Note the parallel lines of enamel stacks at the left corner of the picture. At the right side the lightly col... | oral cavity; Retzius; dentinoenamel junction | Poja Histology Collection - Oral Cavity Subset |
| 36 |
 |
Enamel in longitudinal section of tooth - human, adult. Thin ground section, polarizing microscopy - optical axes of the polarizing plates are crossed at 60. | Using polarizing microscopy the birefringence of the crystalline structure of enamel is colorful demonstrated. Incremental lines (striae) of Retzius are well shown as straight oblique zones. Top right a long dark fissure-like structure representing a crack. | oral cavity; Retzius; dentinoenamel junction | Poja Histology Collection - Oral Cavity Subset |
| 37 |
 |
Enamel in longitudinal section of tooth - human, adult. Thin ground section, polarizing microscopy - optical axes of the polarizing plates are crossed at 60. | Left side enamel and at right side dark-stained striation of dentin. Wavy course of enamel prisms from dentinoenamel junction (right side, scalloped appearance) to the left. The transparent areas represent enamel lanes at a different polarizing angle. | oral cavity; dentinoenamel junction | Poja Histology Collection - Oral Cavity Subset |
| 38 |
 |
Enamel in longitudinal section of tooth - human, adult. Thin ground section. | From left to right: dentin with dentinal tubules; dentinoenamel junction; enamel with arrows pointing to bands (lines) of Hunter-Schreger; these alternating light and dark strips originate at the dentinoenamel junction and do not reach the enamel surface. This optical phenomenon is the result of the... | oral cavity; Hunter-Schreger bands; Retzius | Poja Histology Collection - Oral Cavity Subset |
| 39 |
 |
Enamel in longitudinal section of tooth - human, adult. Thin ground section. | From left to right: incremental lines (striae) of Retzius are distinctly shown as oblique broad zones (at the left) to the enamel surface; during formation of the crown successive apposition of layers of enamel is deposited and results in these so-called incremental grow lines; surface of enamel in ... | oral cavity; incremental lines; Retzius | Poja Histology Collection - Oral Cavity Subset |
| 40 |
 |
Enamel in longitudinal section of tooth - human, adult. Thin ground section. | At the left side surface of enamel in cuspal region; the parallel horizontal arrangement of stacks of rods (prisms) is evident. At the right side area of dentin (dark area). Incremental lines (striae) of Retzius run as curved lines (from bottom to middle top) and presented successive apposition of l... | oral cavity; incremental lines; Retzius; Hunter-Schreger bands | Poja Histology Collection - Oral Cavity Subset |
| 41 |
 |
Enamel in longitudinal section of tooth - human, adult. Thin ground section. | Enamel is compact and acellular, and consists of vertical stacks of rods (prisms) as well as interrod (interprismatic) regions with less calcifying substance parallel to each other. Each prism is surrounded by an enamel sheath (a non-mineralized organic substance). From left to right: surface of ... | oral cavity; enamel rods; enamel prisms | Poja Histology Collection - Oral Cavity Subset |
| 42 |
 |
Enamel rods (prisms) in tooth development - gerbil, postnatal | Electronmicroscopy. Cross-section of rods (prisms) demonstrate round aggregates with hydroxyapatite crystals. Between the round rods the interprismatic substance with crystals orientated in a different course. Note that twisting of the crystallites can be seen in the longitudinal bundles where grey ... | oral cavity; enamel prisms; hydroxyapatite crystals | Poja Histology Collection - Oral Cavity Subset |
| 43 |
 |
Epithelial tooth bud in tooth development - tooth germ, human, embryo | Stain: hematoxylin. At the top stratified ectoderm. The proliferating basal cell layers are palisade-arranged with a light cytoplasm close to the basement membrane (right side). Below the basement membrane subepithelially an accumulation of inductive neural crest-derived mesenchymal cells is locally... | oral cavity; tooth bud; tooth development | Poja Histology Collection - Oral Cavity Subset |
| 44 |
 |
Exocrine gland (salivary gland) | Scheme electronmicroscopy. Part of an acinus of mucous cells with different amount of mucous secretion. Supranuclearly the Golgi areas with maturing mucous secretion granules, basolateral the endoplasmic reticulum. At the top the lumen. The left cell shows an accumulation of the secretory droplets, ... | oral cavity; mucous gland | Poja Histology Collection - Oral Cavity Subset |
| 45 |
 |
Exocrine gland (salivary gland) | Scheme electronmicroscopy. Part of an acinus of serous cells, basolaterally a well developed rough endoplasmic reticulum and apically secretion granules with different maturity towards the small lumen. On top stages of early formed secretion granule (left) and more matured ones (right). Note small j... | oral cavity; serous gland | Poja Histology Collection - Oral Cavity Subset |
| 46 |
 |
Exocrine gland - intercalated duct - submandibular gland, rat | Electronmicroscopy. The dark cells form an intercalated duct from the left lower corner to the right upper corner, and end in the acinus with lightly stained cells (serous). | oral cavity; intercalated duct; serous gland | Poja Histology Collection - Oral Cavity Subset |
| 47 |
 |
Exocrine gland - intercalated duct - salivary glands, pancreas | Scheme electronmicroscopy. Part of an intercalated duct, the low cuboidal epithelial cells contain sparsely organelles and some desmosomal structures. Between the lining cells and the basal lamina is squeezed part of a filament-rich myoepithelial cell. Lumen side top left quadrant. | oral cavity; intercalated duct | Poja Histology Collection - Oral Cavity Subset |
| 48 |
 |
Exocrine gland - intercalated duct - submandibular gland, human | Stain: Azan. Branching intercalated duct draining several serous acini, the lining duct cells are lighter stained due to the content of organelles. Serous cells are darker stained (many organelles) with round nuclei. Note few fat cells, the septa are blue stained. | oral cavity; intercalated duct; serous gland | Poja Histology Collection - Oral Cavity Subset |
| 49 |
 |
Exocrine gland - interlobular duct - submandibular gland, human | Stain: Azan. An interlobular duct with partly columnar as well as pseudostratified columnar epithelium. Note the dense connective tissue of the interlobular septum with small blood vessels. | oral cavity; seromucous glands | Poja Histology Collection - Oral Cavity Subset |
| 50 |
 |
Exocrine gland - parotid gland, rat | Electronmicroscopy. Part of a striated duct with basally membrane infoldings and numerous mitochondria perpendicularly orientated to the basal membrane. Upper side is luminal side. Apically junctional complexes as well as mitochondria and many vesicles are present. | oral cavity; serous gland | Poja Histology Collection - Oral Cavity Subset |