Final answer:
The term 'Normocephalic' is used for a head that is of average size and shape. 'Microcephalic' is used for a small head size, 'Macrocephalic' for a large head size, and 'Hydrocephalic' for a condition with excessive brain fluid.
Step-by-step explanation:
The correct term used in medical documentation to describe a head that is of average size and shape is Normocephalic. This term is commonly used in physical assessments or medical charting to indicate that the head appears to be normal and without any abnormal growths or other deformities. Normocephalic refers to a head that is within the normal range in terms of size and shape. It indicates that there are no significant abnormalities or deviations from the expected measurements.
In contrast, Microcephalic refers to an abnormally small head, Macrocephalic to an abnormally large head size, and Hydrocephalic indicates a condition where there is an abnormal accumulation of cerebrospinal fluid within the brain which can cause head enlargement. The assessment of head size and shape is especially important in newborns because their heads make up a significant proportion of their body size, which is a quarter compared to an adult's one-seventh body proportion.