Health Education Assets Library (HEAL)
 
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TitleDescriptionSubjectCollection
151 Lymph node (rat)Electron microscopy. Within the reticular framework of lymph nodes a variety of active reticular cells are present, some of them (1) have phagocytised foreign material (1a) and contain numerous lysosomal structures (1a) and large Golgi areas (1b)). Others are less active (2). (3) wandering interdig...electron microscopy; interdigitating cell; antigen-presenting cellPoja Histology Collection - Lymphatic Tissues and Organs Subset
152 Lymphoblast in splenic cord of red pulp (rat)Electron microscopy. A free circulating more matured lymphoblast with a conspicuous nucleus and nucleolus (1) still contains many polysomes (2), the swollen mitochondria (3) are obvious. A single fat droplet (4) and Golgi vesicles (5) are present. The cell is partly surrounded by reticular cell exte...electron microscopy; lymphoblastPoja Histology Collection - Lymphatic Tissues and Organs Subset
153 Medullary part of lymph node (human)Stain: Azan. Part of the medulla with darkly stained medullary cords (1) and lightly stained medullary sinuses (2). The cords are stuffed with densely packed lymphocytes and reticular cells. Their blue-stained structures indicate massive bundles of reticular fibres. The sinuses are lined by flattene...medulla; medullar cords; sinusPoja Histology Collection - Lymphatic Tissues and Organs Subset
154 Medullary cords and sinus in lymph node (mouse)Stain: Trichrome (Goldner). Detail of medullary sinus (1) flanked by part of medullar cords (2). The sinus space (1) is lined by flattened littoral cells (foamed cytoplasm) (?) and dispersedly filled with lymphocytes (4) and macrophages (brown hemo-pigment) (3). Within the medullary cords one finds ...medullar cords; medullar sinusPoja Histology Collection - Lymphatic Tissues and Organs Subset
155 Medulla of lymph node (human)Stain: Azan. Part of the medulla showing medullary cords (1) and medullary sinuses (2) close to the hilum and capsule (3). The medullary cords consist of a meshwork of reticular fibers and reticular cells (blue-stained). The cords (1) are more stuffed with lymphocytes and other blood cells. The sinu...medullar cords; medullar sinus; hilumPoja Histology Collection - Lymphatic Tissues and Organs Subset
156 Molluscum contagiosumPhotomicrograph showing cytopathic changes of pox virus (Molluscum contagiosum) in HIV patient.AIDSHEAL Reviewed Collection
157 Molluscum contagiosumPhotomicrograph showing cytopathic changes of pox virus (Molluscum contagiosum) in HIV patient.AIDSHEAL Reviewed Collection
158 Monthly Breast Self-Exam (Labeled)Monthly breast self-exam.Cancer ScreeningRoyal College of Surgeons in Ireland Illustrations
159 Odontoblast in tooth development - mammalian embryoScheme electronmicroscopy. A columnar and irregular shaped cell (mesenchymal origin) with a taperwise odontoblastic process within the predentin. The bottom side is adjacent to the future pulp cells. The cell body contains many organelles and especially a well-developed Golgi area with prosecretoy g...oral cavityPoja Histology Collection - Oral Cavity Subset
160 Parotid gland (human)Stain: Mallory trichrome. Survey: at the left bottom a large interlobular duct (in lumen remnants of secretion products) within a septum of dense connective tissue. At the top thinner (blue) septum, a thick (red-bluish) septum at the left. In the center three (intralobular) striated ducts between th...oral cavity; serous glandPoja Histology Collection - Oral Cavity Subset
161 Papillae circumvallatae of the tongue (dorsal side, human)Stain: Azan. Three broad papillae with taste buds facing the grooves in which the serous von Ebner glands drain. Striated skeletal muscles (musculus verticalis linguae and musculus longitudinalis superior) and lightly stained mucous glands (posterior lingual glands).oral cavity; von Ebner; lingual muscles; lingual glandsPoja Histology Collection - Oral Cavity Subset
162 Papillae filliformes of the tongue (dorsal side, human)Stain: Heidenhain light bordeaux. Threadlike keratinized extensions of the stratified epithelium. Primary connective tissue papillae with 2 to 3 secondary papillae. The skeletal muscle fibers are arranged in three directions.oral cavity; filiform papillaePoja Histology Collection - Oral Cavity Subset
163 Parotid gland (human)Stain: Azan. The parotid gland: in most species the gland is composed entirely of serous acini. At the right a small (intralobular) striated duct; centrally one large interlobular duct with blood vessels. Scattered a few (white) fat cells.oral cavity; serous glandPoja Histology Collection - Oral Cavity Subset
164 Papillae circumvallatae of the tongue (dorsal side, human)Stain: Azan. A broad papilla with taste buds (lightly stained spots) facing the grooves in which the serous glands (von Ebner) drain.oral cavity; von Ebner; circumvallate papillaePoja Histology Collection - Oral Cavity Subset
165 Parotid gland (rat)Electronmicroscopy. Part of a serous acinus with characteristic secretion granules supranuclearly. Note different densities of the granules without any signs of fusion.oral cavity; serous glandPoja Histology Collection - Oral Cavity Subset
166 Pharyngeal tonsil ('gut-associated lymphatic tissue' or GALT) (human)Stain: Azan. The combination demonstrates stages of infiltration (=diapedesis) of lymphocytes in the epithelium of the pharyngeal tonsil. The pharyngeal tonsil or adenoid is located in the nasopharyngeal roof. The agglomerations of lymphocytes (4) are covered by (1) pseudostratified ciliated epithel...pharyngeal tonsil ; GALT; diapedesis; pseudostratified ciliated epitheliumPoja Histology Collection - Lymphatic Tissues and Organs Subset
167 Pharyngeal tonsil ('lymphoepithelial tissues', 'gut-associated lymphatic tissue' or GALT) (human)Stain Azan. The solitary pharyngeal tonsil is localized in the pharyngeal fornix and belongs to the so-called Waldeyer's ring of pharyngeal lymphatic tissue. A: The roof of the nasopharynx is covered by a columnar epithelium with faintly light-stained goblet cells (1) and part of a fold shows cle...pharyngeal tonsil; GALT; pseudostratified columnar epitheliumPoja Histology Collection - Lymphatic Tissues and Organs Subset
168 Permanent tooth - canine, human, adult; low magnification of labiolingual sectionStain: Hematoxylin and scarlet red. From top to bottom: Crown region with dentin but without enamel (decalcified specimens); Neck region at the attachment of the gingiva to dentin (left and right); Cementum is visible as a dark small rim from the neck region to the bottom of the tooth; Periodontal l...oral cavity; alveolar processPoja Histology Collection - Oral Cavity Subset
169 Premolar permanent tooth (human, adult; low magnification of labiolingual section)Stain: Hematoxylin and eosin. From top to bottom: Crown region with enamel-dentin boundary (there is no enamel present in decalcified specimens); dentin (blue-pink) enwraps the whole pulp chamber (light) and here the lines of dentinal tubules appear S-shaped. Neck region at the attachment of the gin...oral cavity; pulp canalPoja Histology Collection - Oral Cavity Subset
170 Periodontal ligament with epithelial rests of Malassez - longitudinal section of root of tooth; human, adultStain: Hematoxylin and eosin. From left to right: connective tissue of periodontal ligament with epithelial rests of Malassez as the persistent remnants of the epithelium of Hertwig's epithelial root sheath. The three islets close to the cemental zone are slightly darker stained (note cluster of nuc...oral cavity; cementoblasts; Sharpey's fibers; acellular cementumPoja Histology Collection - Oral Cavity Subset
171 Predentin formation at the cuspal tip in tooth development - bell stage, human, embryoStain: Azan. From top to bottom: Stellate reticulum consisting of a network of ectoderm-derived cells; Cell layers of the stratum intermedium; Columnar (presecretory) ameloblasts with their upper side (nuclear area) in close contact with the stratum intermedium, and at the distal side (secretion are...oral cavity; predentinPoja Histology Collection - Oral Cavity Subset
172 Periodontal ligament with epithelial rest of Malassez - longitudinal section of root of tooth, higher magnification; human, adultStain: Hematoxylin and eosin. Centrally within the connective tissue of the periodontal ligament a distinct darker stained epithelial islet with nuclei is present (epithelial rest of Malassez as a remnant of Hertwig's epithelial root sheath; in adults it might produce dental cyst). At the right side...oral cavity; cementoblasts; epithelial rest of Malassez; cementoidPoja Histology Collection - Oral Cavity Subset
173 Pheochromocytoma adjacent to adrenal glandThis is a gross photograph of a paranganglioma (pheochromocytoma) adjacent to the adrenal gland.HEAL Reviewed Collection
174 Presecretory ameloblasts in tooth development - bell stage, gerbil, postnatalElectronmicroscopy. Well-arranged epithelial formation of presecretory ameloblasts (active nuclei) with their distal secretion sides towards the thin grey basal lamina. Predentin at the bottom close to the basal lamina and comprises collagen fibers, odontoblastic extensions and dispersed calcified m...oral cavity; predentin; matrix vesiclesPoja Histology Collection - Oral Cavity Subset
175 Presecretory ameloblast in tooth development - mammalian embryoScheme electronmicroscopy. The ectodermal-derived cell appears as tall columnar with fingerlike extensions (dependent on the development stages) at their distal side (secreting area = 'functional base'). These extensions are formed as the cell withdraws during the production of initial enamel. The s...oral cavityPoja Histology Collection - Oral Cavity Subset
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