It's relative to the subject.
Anterior refers to the "beginning"
while posterior refers to an "end"
the opposite of anterior is Posterior.
Anterior means to the front (posterior means to the back). Here are some sentences.A dog's nose is anterior to its tail.The bow of a ship is anterior to the stern.The injury is along the anterior wall of the heart.
Kyphosis.
Ventral pituitary :)... Adenohypophesis is another name for anterior pituitary. Neurohypophesis is another name for posterior pituitary. :)
For a woman : Clitoris, urethral opening, vaginal orifice, anus
posterior
The movement of one anterior surface towards another anterior surface, except in the case of the knee where it is posterior to posterior (Humans Only)
The kidneys have their anterior and posterior surfaces. The foremost surface countenances towards the front stomach wall, while the back posterior surfaces confronting the posterior stomach wall. These surfaces are isolated by the edges of the kidney, which are the significant convexity horizontally, and minor concavity medially.
Anterior, posterior and lateral also.
What animals? As anterior means front and posterior means back, then most-if not all animals have a front and back, or an anterior and posterior. They are usually characterized by a mouth(anterior) or rectum/anus (posterior).
the ventral cavity is anterior to the dorsal cavity which is in the posterior.
Anterior refers to what is in front for example your abdomen is anterior whereas your back is posterior relative to eachother. Another example is that your nose is anterior to your brain. Anterior and posterior are relative terms.
....behind/back and antonym would be anterior - in front/front
Posterior
Anterior
Not sure of the context, but: Anterior = front posterior = rear
If you refer to lungs in humans, then the lungs are anterior to the spine