Organelle

In biology, particularly cell biology, the term organelle is used to describe any one of a number of types of subcellular structures, historically identified through the use of some form of microscopy.

A few large organelles probably originated from endosymbiont bacteria:

• chloroplast
• mitochondrion

Other organelles include:

• centriole
• endoplasmic reticulum
• golgi apparatus
• lysosome
• myofibril
• nucleus
• peroxisome
• ribosome
• vacuole
• vesicle

Other related structures:

• flagellum
• cytosol
• endomembrane system
• nucleosome
• microtubule
• cell membrane

See also: biological cell