Extrinsic Tongue Muscles | Anatomy and Functions [O, I, N, A]

The video tutorial explains the extrinsic muscles of the tongue, including geniohyoid, genioglossus, hyo glossus, styloglossus, and palatoglossus. It details their origins, insertions, actions, and innervations. The tutorial also covers the impact of a hypoglossal nerve lesion on tongue movement, highlighting how it affects muscle function and tongue deviation.

Which of the following muscles does not end with 'glossus'?

• Genioglossus

• Styloglossus

• Geniohyoid

• Hyoglossus

What is the primary action of the geniohyoid muscle?

• Protrude the tongue

• Retract the tongue

• Elevate the hyoid bone

• Depress the tongue

Where does the genioglossus muscle originate?

• Styloid process

• Hyoid bone

• Superior mental spine of the mandible

• Inferior mental spine of the mandible

Which fibers of the genioglossus muscle are responsible for protruding the tongue?

• Middle fibers

• Superior fibers

• Inferior fibers

• All fibers

What is the main action of the hyoglossus muscle?

• Elevate the tongue

• Depress and retract the tongue

• Protrude the tongue

• Elevate the hyoid bone

Which muscle blends with the hyoglossus but has a different origin?

• Geniohyoid

• Genioglossus

• Styloglossus

• Palatoglossus

What is the origin of the styloglossus muscle?

• Hyoid bone

• Mandible

• Styloid process

• Palatine aponeurosis

Which nerve innervates the palatoglossus muscle?

• Hypoglossal nerve

• Facial nerve

• Vagus nerve

• Trigeminal nerve

What happens to the tongue when there is a lesion in the hypoglossal nerve?

• It remains in the midline

• It elevates

• It deviates towards the side of the lesion

• It deviates away from the side of the lesion

Which muscle is responsible for elevating the posterior part of the tongue?

• Palatoglossus

• Hyoglossus

• Genioglossus

• Geniohyoid