Answer:
- A: DORSAL SIDE
- B: ANTERIOR END
- C: VENTRAL SIDE
- D: POSTERIOR END
Step-by-step explanation:
These are terms specify the position of anatomical structures. They are used to establish a relationship of space or distance between one element and another one. These terms are useful when locating anatomical parts or making comparisons, taking as reference the location of another.
Anterior/ Posterior and Dorsal/Ventral are delimitated with an imaginary linear line that divides the body into two parts.
In the exposed example, we might first compare the dorsal and the ventral part of the orca´s body.
- So the imaginary line passes through the orca longitudinally, dividing it into two parts, from the mouth to the caudal fin. The line delimitates the dorsal part -which corresponds to the back of the animal- and the ventral part -which corresponds to the abdominal area-. So, if you need to describe the position of the dorsal fin, for instance, you can say that it is dorsally placed. But if you want to describe the position of the sexual organs, you can say they are in the ventral region.
So the A label is pointing to the dorsal side of the orca. And the C label is pointing to the ventral side.
- Now the imaginary line is transversal to the orca´s body and divides it in the anterior end/extreme and the posterior end/extreme. If you need to locate the eyes, you might say that they are in the anterior part of the body -the anterior end. And if you need to indicate where is the caudal fin, you can say that it is in the posterior end of the body.
The B label is pointing to the anterior end, while the D label is pointing to the posterior end.
- So now, let us place both imaginary lines together. The orca´s body is now divided into four parts. You can use this division to be even more specific while making a description. You can say that the blowhole is anteriorly and dorsally. The genitals are posteriorly and ventrally. Flippers are anteriorly and ventrally. And so on with different structures.
So take a look at the attached file. You will find every step with the regions and the named structures for a better understanding