Irritated itchy skin on the back, legs, and hips can mean that the bedding and clothing need to be checked for bedbugs. Another potential cause is dry weather, which can cause skin to be dry and irritable.
The posterior plane is the one that is in the back. If you have a square it would be the back of it.
You might have body acne.
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).
Towards the back is posterior and towards the front is the anterior.
Posterior means towards the rear of the frog.
A fundal posterior position of the placenta simply means that the placenta is resting at the back of the uterus. Ultrasounds should be taken to ensure that the placenta is not laying low, which can cause placenta previa.
Posterior simply means the back side or behind, which is the opposite of anterior, which is the front side.
The back surface. (ex: the tail of a pig is at it's posterior end)
Actually, the word "Posterior" means: To the back. So, for example: Your heel is posterior to your toes.
back
posterior
....behind/back and antonym would be anterior - in front/front