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57 terms

Histology 2

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Straited muscle
regular arrangement of actin and myosin
Smooth muscle
uninucleate, contracts slowley
Sarcoplsmic reticulum
Smooth ER in muscle cells
Myofibril
in a muscle fiber, contains aligned protein structures
Sarcomere
functional unit of striated muscle
Sarcolemma
outer membrane of the skeletal muscle fiber
T tubules
invaginations of the sarcolemma
Terminal cisternae
Expanded portions of the Sarcoplasmic reticulum
Mitochondria and glycogen granules
found between myofibrils
Red fibers
high concentration of myoglobin and glycogen, fatigue resistant
White fibers
less mitochondria, myoglobin etc
Motor unit
motor neuron and muscle fibers that are innervated by it
Motor end plate
neuron and muscle fiber contact
Junctional folds
folded sarcolemma in motor end plate
Muscle spindles
receptors in muscle that sense degree of stretch of a muscle
Intrafusal fibers
fibers in a muscle spindle
nuclear bag
larger intrafusal fibers
nuclear chain
smaller intrafusal fibers
Smooth muscle
doesn't have striations, located in gi, repro, iris, etc
Sarcolemma
plasma membrane, has caveolae
Caveolae
small invaginations and vesicles on sarcolemma, release calcium ions
dense bodies
attachment sites for intermediate myosin filaments, dark stain in cytoplasm
Jap junctions
Between sm cells, allows ionic communication bt cells
Hepatocytes
The parenchyma of the liver, contains glycogen/lipid
tight, desmosomes, and gap
Types of juctions that hepatocytes have
Sinusoids
Spaces in between hepatocytes, "of disse"
Kupffer cell
line liver sinusoids, has fixed macrophage, binds: hemoglobin, LDL, etc, antigen processing, RBC degradation
Ito cell
lipid droplets, stores vitamin A in liver
endothelial
fenestrated,no pericytes, type 4 collagen
Serosa
Visceral peritoneum, may contain smooth muscle
Reticular fibers
holds liver together
Classic Hepatic lobule
Endocrine fxn of liver, centered around a central vein, triad (artery, vein, bile) on side,
Sinusoids
small blood vessels bt hepatocyte plates
Bile canalicula
drain into bile ductules then interlobular bile duct
Distributing veins/arteries
connect artery/vein into sinusoids
Portal lobule
exocrine fxn of liver, bile
Liver Acinus
3 zones, hepatic reginerations
Chondrocytes
Cells in cartilage
Collagen, Elastic
Fibers in cartilage
Lacunae
space that chondrocyte is in
Hyaluronic acid, chondroitin sulfate
two major glycosaminoglycans in collagen, b/c of sulfate bonds stains basophilically
Perichondrium
capsule-like sheath of dense irregular connective tissue (ABSENT IN FIBROCARTILAGE)
Centers of chondrification
sites of developing cartilage
Territorial matrix
matrix surrounding each lacunae
Interstital growth
add matrix from existing chondrocytes
Appositional growth
cartilage growth from outside
Fibrocartilage
intervertebral disks, menisci of stifle joint, no perichondrium, has collagen bundles
Hyaline cartilage
articular surfaces (no perichondrium), nose, larynx etc, has collagen fibers
Elastic cartilage
pinna of ear, epiglottis, has elastic fibers
limellae
longitudinally laminar structures or curved sheets
Osteons
structural unit of bone, circularing a centeral canal
Interstitial lamellae
irregular groups of lamellae
Circumferential lamellae
continuous bony lamellae extending around external and internal surfaces of bone shaft
osteocytes
live in lacunae in bone
osteoclasts
involved in bone reabsorption
Volksmans canals
tunnel that osteons communicate to each other
Intramembranous bone formation
bone that forms directly from mesenchyme (skull)