|Extrinsic muscles of the tongue|
You can see three out of the four extrinsic muscles here..
Lemme tell you about them! ^_^
Origin: From tip and anterior surface of the styloid process
Insertion: Into the side of the tongue
Action: So what'll be its action? Its pulling the tongue to its origin.. ie behind
Hence action will be retraction of tongue
Origin: Greater cornua and lateral part of hyoid bone
Insertion: Side of the tongue
Action: Think.. Pulling the tongue downward, towards the origin.. Hence, depression of tongue
Origin: Upper genial tubercle of the mandible
Insertion: Forms bulk of the tongue
Action: Protrudes the tongue.. [Pulling towards origin, remember?]
Sorry guys.. I don't have a diagram for this muscle.. Will upload soon!
Origin: Oral surface of palatine aponeurosis
Insertion: Descends into the palatoglossal arch to side of tongue at junction between oral and pharyngeal parts
Action: Elevation of tongue
I have shown the nerve supply.. Its hyoglossal nerve.
Except for palatoglossus.. which is supplied by the cranial part of the accessory nerve (CN XI) that travel via the pharyngeal plexus
I just love this diagram.. Shows the muscles properly with the nerve supply.. and it's really cute.. So do make the diagram in your exam, it's really easy! :)
So basically you can remember the origin and insertion through the diagram.. I'll elaborate on palatoglossus with the muscles of the palate.. That's all for the extrinsic muscles!
Thank you so much for reading!
Pray that I do well in my exams =)