Question

Which of the following statements concerning the human tongue is correct?

a. Voluntary movement of the tongue during chewing is controlled by CN XII
b. Involuntary movement of the tongue during swallowing is controlled by CN IX
c. Circumvallate papillae are found over the entire dorsal surface, front and back
d. Stratified squamous epithelium is found on the ventral surface only

Answer 1

The human tongue is involved in chewing, swallowing, and speaking. Voluntary movement is controlled by CN XII, while involuntary movement is controlled by CN IX. Circumvallate papillae are located towards the back of the tongue, and stratified squamous epithelium covers the ventral surface.

Step-by-step explanation:

The human tongue plays a crucial role in chewing, swallowing, and speaking. The voluntary movement of the tongue during chewing is controlled by CN XII (Hypoglossal Nerve), which sends signals from the brain to the tongue. On the other hand, the involuntary movement of the tongue during swallowing is controlled by CN IX (Glossopharyngeal Nerve).

The dorsal surface of the tongue contains taste buds and is covered by papillae, including circumvallate papillae. These papillae are located towards the back of the tongue and appear as larger round structures. The ventral surface of the tongue, on the other hand, is covered by stratified squamous epithelium.