Medulla

Definition

In the context of the integumentary system, the medulla refers to the innermost layer of hair, made up of a soft, keratinized core that provides elasticity and flexibility to the hair strand. Within the context of gross anatomy of the kidney, it is the innermost part of the kidney that contains nephrons essential for urine production through filtration, reabsorption, and secretion processes.

Related terms

Cortex (of hair): The outer layer of a hair strand that provides strength, color, and texture.

Nephron:

The functional unit within kidneys that filters blood to produce urine.

Renal Pelvis: The central funnel-shaped part of the kidney that collects urine from the medulla before it flows into the ureter