Deep is the directional term that means "within the body" and further away from the body surface. [Contrast this with superficial which means "toward the body surface".] For example: the muscular layer is deep to the skin, but superficial to the intestines.
The medical term meaning pertaining to the neck and arms is "cervicobrachial."
Ciliary means pertaining to cilia, hairlike structures in the body.
The medical term meaning pertaining to the direction of the tailbone is "caudal." This term is used to describe structures that are situated closer to the tailbone or tail end of the body in anatomical orientation.
Diarthrotic means pertaining to two joints.
The immune system comprises the body's defenses.
Epithelial is the medical term meaning pertaining to epithelium.
Muscular means pertaining to muscle.MuscularMuscular (Muscul = ref to muscle + ar = pertaining to) is an adjective, so it has to have something to modify, such as muscular body, intramuscular injection, muscular contraction, etc.Did you know that the Latin "musculus" which we generally interpret as "muscle" literally means "little mouse"? The same reference is found in the Greek "mys" which means both "mouse" and "muscle". Apparently some of the muscles, in contraction, looked like a mouse body or reacted like a mouse would.
The medical terminology combining form -alis generally refers to "pertaining to." It is commonly used to indicate a relationship or connection to a specific body part or system.
MedialMedio = middle-al = pertaining toMedial = pertaing to the middleMedial
Posterior (Back)Anterior (Front)term means pertaining to the back and to the front
Throughout the body or body part, when talking about health. If talking about medical coding, it has a completely different meaning that I'm not qualified to explain well.
The medical term is "visceral." It refers to structures or functions related to the internal organs within the body's cavities, such as the abdomen or thorax.