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Histology
muscle
33
Veterinary Medicine
Professional
09/02/2008

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Term
muscle fiber/myofiber
Definition
a single muscle cell, composed of myofibrils
Term
myofibril
Definition
filaments made up of actin and myosin that run from one end of the muscle fiber to the other
Term
Myofilaments
Definition
any of the ultramicrosopic threadlike structures composing the myofibrils of striated muscle fibers: thick ones contain myosin, thin contains actin
Term
sarcolemma
Definition
the membrane covering a striated muscle fiber
Term
sarcoplasm
Definition
the interfibrillary mater of striated muscle i.e. the cytoplasm of muscle
Term
sarcoplasmic reticulum
Definition
the endoplasmic reticulum found in striated muscle fibers
Term
skeletal muscle
Definition
One of three types of muscle tissue in the body (skeletal, smooth, cardiac) which represents the majority of the muscular tissue in the body. Skeletal muscle is the type of muscle which powers movement of the skeleton as in walking and lifting
Term
striated
Definition
marked with striae:striped, grooved or ridged
Term
multinucleated cell
Definition
characterized by having more than 1 nucleus with an individual cell
Term
syncytium
Definition
a mass of cytoplasm containing several nuclei and enclosed in a membrane but no internal cell boundaries (as in muscle fibers
Term
myoblasts
Definition
undifferentiated cells of mesoderm able to give rise to muscle cells
Term
mesoderm
Definition
One of the three primary germ cell layers in the very early embryo. The mesoderm is the middle layer. It differentiates to gives rise to a number of tissues and structures including bone, muscle, connective tissue, and the middle layer of the skin
Term
connective tissue sheath
Definition
the connective tissue of an organ or part that binds together its component elements and holds them in place
Term
endomysium
Definition
the fine connective sheath surrounding a muscle fiber (innermost sheath)
Term
perimysium
Definition
connective tissue sheath which groups individual muscle fibers into bundles
Term
epimysium
Definition
fibrous sheath around skeletal muscle (encompasses both peri and endomysium)
Term
fasicle
Definition
a small or slender bundle
Term
fascia
Definition
a flat band of tissue below the skin that covers the underlying tissues and separates different layers of tissue
Term
motor end plate
Definition
the flattened end of a motor neuron that transmits neural impulses to a muscle
Term
sarcomere
Definition
the contractile unit of a myofibril
Term
cytoplasmic filaments
Definition
actin filaments, myosin filaments and intermediate filaments
Term
actin
Definition
a protein found in muscle that together with myosin functions in muscle contraction
Term
myosin
Definition
involved in muscle contraction along with actin, also the most common protein in the muscle
Term
T-tubule
Definition
the tubule that passes in a transverse manner from the sarcolemma across a myofibril
Term
cardiac muscle
Definition
the specialized straited muscle tissue of the heart
Term
striated fiber
Definition
an elongated contractile cell in striated muscle tissue
Term
intercalated disk
Definition
an undulating double membrane separating adjacent cells in cardiac muscle
Term
Purkinje fiber
Definition
one of the specialized cardiac muscle fibers, part of the impulse conducting part of the heart, that rapidly transmit impulses from the atrioventricular node to the ventricles
Term
Glycogen
Definition
A polysaccharide that is the main form of carbohydrate storage in animals and occurs primarily in the liver and muscle tissue. It is readily converted to glucose as needed by the body to satisfy its energy needs.
Term
PAS(periodic acid-Schiff) stain
Definition
a reaction that tests for polysaccharides and related substances through the treatment of tissue sections with periodic acid stain and Schiff's reagent
Term
Smooth Muscle
Definition
1 of the 3 major types of muscle, Generally forms the supporting tissue of blood vessels and hollow internal organs such as the stomach, intestine, and bladder. Has no striations and is spindle shaped
Term
Pinocytotic vesicle
Definition
a vesicle, a fraction of a micrometer in diameter, containing fluid or solute being ingested into a cell by endocytosis
Term
Myoepithelial cell
Definition
cell found between epithelium of exocrine glands and their basement membranes, which resembles a smooth muscle cell and is thought to be contractile.
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