What is filament?

Filament is a fine threadlike structure.
acrosomal f. A stiff filament extruded by the acrosomal cap at the head of the spermatozoon, when it contacts the surface of a targeted ovum.
actin f. The smaller of the two contractile elements in muscle fibers, measuring about 50 A in width; in skeletal and cardiac muscles, one end is attached to the Z line, a transverse septum that gives the muscle a characteristic striated appearance; the other free end interdigitates with the myosin filament in the contraction and relaxation of muscle.
axial f. The central filament of the tail of a spermatozoon, consisting of a central pair
of fibrils within a symmetrical set of nine doublet fibrils, enveloped by an outer ring of nine larger dense fibers.
myosin f. The thicker of the two contractile elements in all muscle fibers; in skeletal and cardiac muscles, it measures about 100 A in width, and traverses the central portion of each sarcomere, producing a dense A band; when interdigitating with the free ends of actin filaments, it is responsible for the contraction and relaxation of muscle.
spermatic f. The short naked fragment at the terminal part of the tail of a spermatozoon.

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