Question

Which of the following is an extrinsic muscle in human tongue:
 A) Hyoglossus
B) Palatoglossus
C) Styloglossus
D) All of the above

Answer 1

Hint:There are eight muscles of the human tongue which are either intrinsic and extrinsic. The four intrinsic muscles act to change the shape of the tongue and are not joined to any bone. The four extrinsic muscles act to change the position of the tongue and are anchored to bone.

Complete answer:
Hyoglossus muscle, Palatoglossus muscle, and styloglossus muscle all three are extrinsic muscles of human tongue.

Hyoglossus is a thin, flat sheet of muscle. Its strands run upwards and forwards. Hyoglossus emerges from the whole length of the greater horn of the hyoid bone and ends here, at the edge of the tongue. Hyoglossus straightens the tongue, and pulls it in backwards and downwards.
Palatoglossus muscles make edges of mucous layer in the parallel pharyngeal wall called the palatoglossal arches. These structure the lateral boundary between the oral cavity anteriorly and the oropharynx posteriorly. It is additionally alluded to as one of the five matched muscles of the delicate sense of taste.

The styloglossus muscle begins at the distal horizontal aspect of the stylohyoid bone and ventures to the length of the tongue, along its lateral aspect. Close to the tip of the tongue the paired muscle meets and ramifies with strands of other tongue muscles. Contraction of the styloglossus withdraws the tongue.

Therefore, the correct answer is option D, i.e. All of the above.,

Note :The hyoglossus depresses down and retracts the tongue and makes the dorsum more raised. The palatoglossus muscle capacities to elevate the posterior segment of the tongue. It likewise draws the delicate sense of taste poorly, in this manner narrowing the breadth of the oropharyngeal isthmus. The styloglossus draws up the sides of the tongue to make a box for gulping. Together they additionally help in withdrawing the tongue.