Remember:
The anterior part of the tongue tends to drain into the nodes farthest down the deep cervical chain (See diagram) ^_^
Anterior two thirds drain unilaterally
Posterior one third bilaterally
That's all you need to know! :)
-ikaN
Wednesday, November 2, 2011
Lymphatic drainage of the tongue
Remember:
The anterior part of the tongue tends to drain into the nodes farthest down the deep cervical chain (See diagram) ^_^
Anterior two thirds drain unilaterally
Posterior one third bilaterally
That's all you need to know! :)
-ikaN
Extrinsic muscles of the tongue
 |
| Extrinsic muscles of the tongue |
You can see three out of the four extrinsic muscles here..
Lemme tell you about them! ^_^
Styloglossus
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
Hyoglossus
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
Genioglossus
Origin: Upper genial tubercle of the mandible
Insertion: Forms bulk of the tongue
Action: Protrudes the tongue.. [Pulling towards origin, remember?]
Palatoglossus
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
Nerve supply
I have shown the nerve supply.. Its hyoglossal nerve.
Except for palatoglossus.. which is supplied by the vagus and 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 =)
-IkaN
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