2. In the olfactory bulb, an anatomically discrete module receiving input from an olfactory sensory neuron.
3. One of the structures which comprise the nephron (functional unit) in the kidney. The glomerulus is composed of capillary blood vessels which are actively involved in the filtration of the blood.
The glomerulus in the kidney was so named by the Italian anatomist Marcello Malpighi (1628-1694). The structure was once called a malphigian corpuscle. Glomerulus is the diminutive of the Latin glomus meaning "ball of yarn". It is literally a "little ball of yarn".