Questions about the brain? ?

Question

What are three types of sensations perceived by the sensory area of the cerebrum?

Explain why only a small area in the sensory region of the cerebrum is sensitive to stimuli from the leg?

Which part of the body contains most sense receptors relative to its actual size?

a) trunk

b) shoulder

c) hip

d) tongue

Which of the following structures has the fewest nerve endings in relation to **** actual size?

a) arm

b) face

c) fingers

d) lips

Answer 1

tongue and arm

Answer 2

The neurosurgeon Wilder Penfield did a great deal of work mapping how much of the sensory and motor cortices were dedicated to which part of the body. He made drawings that showed the brain and what part maps to what part of the body. These "homunculus" drawings are still used today. The best version I found is http://faculty.etsu.edu/currie/images/ho...

Using figure (a), it is easy to answer your questions. For the first question, the trunk, shoulder, and hip are relatively large body parts but they get very small regions on the sensory cortex. The tongue is a small body part but gets a large region on the map.

For the second question, the face, fingers, and lips have huge parts of the map, but the arm has but a tiny part.