Science Source Feb 2010

Myelin sheath in a nerve.

Schwann cell in a nerve. Schwann cells form myelin, which holds nerve fibers together.

Schwann cell in a nerve. Schwann cells form myelin, which holds nerve fibers together.

Myelinated and unmyelinated nerve fibers.

Scanning Electron Micrograph of a blood clot in a mouse. Mag., x6,500

Transmission electron micrograph of the intestinal epithelium of a chicken embryo. This pair of centrioles near the lumenal surface of an epithelial c...

Transmission electron micrograph of interscapular brown adipose cell from the bat. The mitochondria herein are exceedingly numerous and have an extens...

Electron micrograph of a fragment of subcutaneous connective tissue, air dried, and shadowed with chromium. This is probably the normal arrangement of...

Scanning electron micrograph (SEM) of a single fungiform papilla from the human tongue. The tongue is covered in numerous tiny projections, called pap...

Scanning electron micrograph (SEM) of lymphocytic leukemia or chronic lymphocytic leukemia (CLL). CLL is a type of leukemia that affects the B cells,...

Transmission electron micrograph of a frog myoneural junction prepared by freeze substitution. The nerve terminal is covered by a portion of Schwann c...

An SEM of the first cleavage of an Xenopus ovum.

Fertilization. Sperm about to fertilize ovum.

Illustration of a 30 nm chromatin nucleoprotein fiber showing its helical structure around a central channel. Histones, represented by small spheres,...

Mast cell in connective tissue. A mast cell, (or mastocyte), is a resident cell of several types of tissues and contains many granules rich in histami...

Transmission electron micrograph of an insulated pancreatic acinar cell. Acinar cells produce digestive enzymes.

Transmission electron micrograph of a freeze fracture preparation of a glandular cell of adrenal medulla. The nuclear pores and secretory granules are...

Transmission electron micrograph of the adjoining portions of two cells in the stratum spinosum of hamster cheek pouch epithelium. Uranyl acetate stai...

Transmission electron micrograph of a freeze-fractured gap junction of a granulosa cell of an ovarian follicle.

Transmission electron micrograph of the head and part of the midpiece of a bat spermatozoon. The mitochondrial sheath encasing the midpiece is clearly...

Transmission electron micrograph of asynchronous flight muscle in a fly. Thick filaments are arranged hexagonally and surrounded by six thin filaments...

Transmission electron micrograph of a plasma cell from guinea pig bone marrow. This cell is actively engaged in the synthesis of immunoglobulin and th...

Transmission electron micrograph of a Golgi complex in the caudal cytoplasm of a ram spermatid. From a late spermatid after completion of acrosome for...

Scanning electron micrograph of cilia on a cell in the human oviduct. Despite their appearance here, all cilia on a cell would normally be in the same...

Electron micrograph of a portion of a mixed nerve, showing myelinated and unmyelinated axons and a cell of the perineurium.

Negatively stained preparation of nuclear pore complexes.

Transmission electron micrograph of a vascular smooth muscle cell in cross section. Thick myosin filaments are visible as the relatively large dark do...

Illustration of the location, component, and membrane relationships at the junctional complex between epithelial cells. At right is a detail of a gap...

Diagram of the components of a typical mammalian spermatozoon. The Acrosomal Cap and the Postacrosomal Region comprise the head. The tail is composed...

Transmission electron micrograph showing the filaments of the cytoskeleton.

Cross sectional transmission electron micrograph of the midpiece of a mammalian sperm tail. The mitochondrial sheath is clearly visible.

Transmission electron micrograph of a nucleus, endoplasmic reticulum, and a secretory granule of a glandular cell.

Transmission electron micrograph of rough endoplasmic reticulum in the basal cytoplasm of a pancreatic acinar cell from a bat. The reticular cisternae...

Neutrophil leukocyte phagocytosing bacteria. THE CELL 2nd edition.

Nervous tissue. Micrograph of myelinated and unmyelinated axons.

Transmission electron micrograph of portions of two hepatic cells and the intervening bile canaliculus from rat liver. There are two stacks of Golgi c...

Illustration of the structure of the midpiece, principal piece, and endpiece of a mammalian spermatozoon. The fibrous sheath of the principal piece is...

Cross sectional transmission electron micrograph of spermatozoa in the testis of a moth. As with many Lepidopteran spermatozoa, the flagellar membrane...

Transmission electron micrograph of an odontoblast from a rat incisor. The supranuclear region of this odontoblast is actively secreting dentin matrix...

Transmission electron micrograph of a Nissl body of a large neuron. A Nissl body is a large angular block of basophilic material, seen in neurons, com...

Transmission electron micrograph of smooth endoplasmic reticulum from an interstitial cell of the testis. The configuration of the smooth reticulum se...

Transmission electron micrograph of a cell from the zona fasciculata of guinea pig adrenal cortex. The configuration of the smooth reticulum seen here...

Transmission electron micrograph of striated papillary muscle from a cat heart. The cross-banded appearance results from the ordered arrangement of ac...

Micrograph of dividing mitochondria in gastric mucosa of a mole. The bilaminar septum has been formed, but separation of the two compartments by invas...

Transmission electron micrograph of a cell from the ductulus efferens of the ground squirrel. The majority of the mitochondrial profiles in this image...

Cross sectional transmission electron micrograph of spermatozoa in the testis of a moth. As with many Lepidopteran spermatozoa, the flagellar membrane...

Cross sectional transmission electron micrograph of a sperm tail at the level of the principal piece, prepared with tannic acid. The organization of t...

Transmission electron micrograph of cytoplasm in a 3T3 cell, showing typical 10 nm filaments coursing through the meshes of the endoplasmic reticulum.

Transmission electron micrograph of a pair of centrioles and adjacent dictyosomes of the Golgi complex.

Transmission electron micrograph of a human polymorphonuclear leukocyte, also known as a neutrophil. This young neutrophil has a relatively simple nuc...