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Periarteriolar lymphoid sheaths (or periarterial lymphatic sheaths, or PALS) are a portion of the white pulp of the spleen.They are populated largely by T cells and surround central arteries within the spleen; the PALS T-cells are presented with blood borne antigens via myeloid dendritic cells.
Muscle is stained blue-black to dark brown, connective tissue is pale orange-pink to brownish red, fibrin and neuroglia stain deep blue, coarse elastic fibers show as purple, and bone and cartilage obtain yellowish to brownish red color. PTAH is ideal for demonstrating striated muscle fibers and mitochondria, often without a counterstain.
Red skeletal muscle cell (slow twitch) Contractile cells Skeletal muscle cells White skeletal muscle cell (fast twitch) Intermediate skeletal muscle cell: Nuclear bag cell: muscle spindle: Nuclear chain cell: muscle spindle: Myosatellite cell (stem cell) Cardiac muscle cell: Cardiac muscle cells SA node cell: Purkinje fiber cell Smooth muscle ...
Dilated peri-tubular capillaries filled with sickled RBCs, original Gomori's trichrome stain, × 400. [1] The "ragged red fibers" in MELAS syndrome are visible under modified Gomori stain. Gömöri trichrome stain is a histological stain used on muscle tissue. [2] [3] It can be used to test for certain forms of mitochondrial myopathy.
Micrograph showing contraction band necrosis, a histopathologic finding of myocardial infarction (heart attack).. Histopathology (compound of three Greek words: ἱστός histos 'tissue', πάθος pathos 'suffering', and -λογία-logia 'study of') is the microscopic examination of tissue in order to study the manifestations of disease.
Secondary muscle fibers then form around the primary fibers near the time of innervation. These muscle fibers form from secondary myoblasts and usually develop as fast muscle fibers. Finally, the muscle fibers that form later arise from satellite cells. [3] Two genes significant in muscle fusion are Mef2 and the twist transcription factor.
The Terminologia Histologica (TH) is the controlled vocabulary for use in cytology and histology. [1] [2] In April 2011, Terminologia Histologica was published online [3] by the Federative International Programme on Anatomical Terminologies (FIPAT), the successor of FCAT.
In the upper esophagus, part of the externa is skeletal muscle, rather than smooth muscle. In the vas deferens of the spermatic cord, there are three layers: inner longitudinal, middle circular, and outer longitudinal. In the ureter, the smooth muscle orientation is opposite that of the GI tract. There is an inner longitudinal and an outer ...