The eyes is majorly divided into 3 parts: vitreous chamber, anterior and posterior chambers.
Vitreous chamber is the largest, a clear jellylike substance that fills the back part of the eye lies behind the lens and surrounded by blood vessels
Anterior chamber is in the front section of the eye, separating the cornea and iris and contains a aqueous humor (a clear watery fluid) flowing through to provide nourishment.
The aqueous passes through the posterior chamberlocated behind the iris and flows through the pupil located on the iris' back into the anterior chamber.
....behind/back and antonym would be anterior - in front/front
The key differences between the posterior and anterior regions of the human body are their locations. The posterior region is the back side of the body, while the anterior region is the front side. Additionally, the posterior region typically has larger muscles and more bony prominences compared to the anterior region.
There is an anterior chamber and a posterior chamber to the eye. The anterior chamber is from the lens and iris forward to the back of the cornea. The posterior chamber is from the back of the lens to the retina. The anterior chamber is filled with aqueous. The posterior chamber is filled with vitreous.
the ventral cavity is anterior to the dorsal cavity which is in the posterior.
The anterior pituitary produces and secretes its own hormones in response to releasing hormones from the hypothalamus, while the posterior pituitary stores and releases hormones produced by the hypothalamus. The anterior pituitary is derived from glandular tissue, while the posterior pituitary originates from neural tissue.
Anterior. Meaning towards the front.
posterior
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.
....behind/back and antonym would be anterior - in front/front
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).
Anterior and posterior are orientation terms with opposite meanings in humans. Anterior refers to the front of the body, while posterior refers to the back of the body.
Anterior, the front. As opposed to posterior, behind
Before in time; antecedent., Before, or toward the front, in place; as, the anterior part of the mouth; -- opposed to 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