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Figure-Ground 
The differentiation between the foreground and the background of a scene; this refers to all sensory systems, including vision, hearing, touch. 

Flaccid 
Lacking normal muscle tone; limp. 

Flexion 
Bending a joint. 

Foley Catheter 
This is a tube inserted into the urinary bladder for drainage of urine. The urine drains through the tube and collects into a plastic bag. 

Frontal Lobe 
Front part of the brain; involved in planning, organizing, problem solving, selective attention, personality and a variety of "higher cognitive functions." 

Frustration Tolerance 
The ability to persist in completing a task despite apparent difficulty. Individuals with a poor frustration tolerance will often refuse to complete tasks which are the least bit difficult. Angry behavior, such as yelling or throwing things while attempting a task is also indicative of poor frustration tolerance.