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T/F Temporal Fossa, Temporomandibular Joint, and Infratemporal Fossa

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Posted by Ichneumia Rapidae on November 26, 2014 at 17:45:47:

Easter eggs for all!

1. The lesser superficial petrosal nerve is part of a somatic plexus whereas the buccal nerve is part of an autonomic trunk. FALSE, reverse. GVE of lesser superficial petrosal nerve (autonomic, CN:XI) vs SVE of buccal nerve (branchiomotor, CH:V).

2. The masseteric nerve passes through the mandibular notch. TRUE

3. The posterior superior alveolar nerve branches from the maxillary nerve within the pterygopalatine fossa and enters the infratemporal fossa through the pterygomaxillary fissure. TRUE

4. The buccal nerve passes the (lateral) aspect of the masseter muscle. FALSE, medial (deep)

5. The chorda tympani joins onto the (inferior alveolar) nerve before distributing to the anterior 2/3 of the tongue. FALSE, lingual. However, there is a communicating branch between the lingual and inferior alveolar nerve. What it does, a mongoose would not pretend to know!

7. Postganglionic fibers from the otic ganglion join onto; first the chorda tympani, and then the lingual nerve. FALSE, a better narrative would be: postganglionic fibers (GVE), that had synapsed with preganglionic fibers whose cell bodies reside within the Inferior Salivatory Nucleus and composed part of CN IX, travel with the Auriculotemporal nerve (GSA, third twin) to reach the parotid gland. Chorda tympani is a branch of the facial nerve which contains GVE and SVA fibers. I think, both hop on lingual nerve (V3) but preganglionics hop off lingual to synapse in submandibular ganglion while SVA fibers hop off more distal to provide taste to anterior 2/3 of the foot. Oops, words.

8. A lesion of the chorda tympani within the infratemporal fossa is expected to decrease sensitivity of touch to the posterior 1/3 of the tongue as well as decrease lacrimation. FALSE, While a lesion in the infratemporal fossa may lead to decreased GSA to ANTERIOR tongue via Lingual nerve and SVA (taste) to anterior 2/3 tongue (CT, VII); decreased lacrimation and touch sensitivity to posterior 1/3 of tongue are the responsibility of two nerves that dont really have presence in the infratemporal fossa. Decreased lacrimation is provided by GVE fibers of VII. After preganglionics (parasympathetics) travel through pterygoid canal, they reach the Pterygopalatine (spenopalatine) glanglion within the pterygopalatine fossa (different space from infratemporal fossa!). Synapse at this ganglion with postganglionic fibers allows them to jump on maxillary (zygomatic?) nerve to reach the lacrimal gland. Sensitivity to posterior 1/3 of tongue is the responsibility of Glossopharangeal nerve (GVA). These pseudounipolar neurons have their cell bodies within the petrosal ganglion - outside of the jugular foramen (an area not near infratemporal fossa?) TLDR: I tried to construct an accurate narrative from this T/F but scared the snakes away with words.

9. A lesion of the lingual nerve within the floor of the mouth is expected to disrupt both taste and touch to the anterior 2/3 of the tongue. TRUE, CT may not have stopped traveling with lingual nerve at that point.

10. The mouth is apt to be stuck open if the condyle of the mandible slips forward to the articular tubercle. TRUE, spastic action of lateral pterygoid m. keeps the condyle of the mandible anterior and superior to its normal resting place in the mandibular fossa. Not good if you're a mongoose.

11. The left body of the mandible is one on the most commonly broken bones in males. TRUE, those mean right hooks!

12. The inferior alveolar nerve contributes to the inferior dental plexus and then continues onto the face as the mental nerve. TRUE.

13. The nerve to the mylohyoid conveys GSE fibers to the mylohyoid muscle and SVE fibers to the anterior belly of the digastric. FALSE, should both be SVE, both muscles derived from first pharyngeal arch mesenchyme.

14. The buccal nerve conveys SVE and GSA fibers to the buccinator muscle. FALSE, buccal nerve (third twin) only GSA to oral mucosa, goes through buccinator. Buccal branch of VII does SVE to buccinator muscle. Yo-ho, yo-ho.

15. The inferior (alveolar) nerve encircles the middle meningeal artery. FALSE, auriculotemporal

16. The posterior superior alveolar artery does not enter the pterygopalatine fossa despite that the nerve of the same name is within this fossa. TRUE, it hangs out on the lateral (superficial) surface of the (zygomatic?) bone.

17. The medial pterygoid muscle arises from the medial pterygoid plate whereas the lateral pterygoid muscle arises from the lateral pterygoid plate. FALSE, they both have origins at lateral pterygoid plate (sphenoid bone).

18. The hamulus is an inferior extension of the (lateral) pterygoid plate. FALSE, medial

19. The maxillary artery passes from the infratemporal fossa to the pterygopalatine fossa whereas the maxillary nerve does not enter the infratemporal fossa. TRUE?, tough question for a mongoose.

20. The lingula of the mandible is a site of attachment for the (pterygomandibular raphe). FALSE, sphenomandibular ligament

21. The (hamulus of the medial pterygoid plate) is a site of attachment for the sphenomandibular ligament. FALSE, spina angularis (sphenoid bone)

22. The groove for the mylohyoid nerve proceeds inferior and anterior from the mandibular foramen. TRUE

23. A lesion of the lesser superficial petrosal nerve is expected to cause ipsilateral salivatory deficits. TRUE, parotid gland (GVE, IX)

24. A lesion of the lingual nerve at the foramen ovale is expected to disrupt touch (GSA) but not taste (SVA) to the anterior 2/3 of the tongue. TRUE, petrotympanic fissure transmits the CT nerve to lingual, they join distal to the proposed lesion.

25. A lesion of the auriculotemporal nerve just medial to the neck of the mandible is expected to cause a salivatory deficit. TRUE, parotid branch (GVE, IX) would be disrupted.

26. The sympathetic root of the otic ganglion is derived from the external carotid plexus (middle meningeal plexus).TRUE? Probably, because if sympathetics follow arterial supply, the closest vessel to the otic ganglion would be the middle meningeal artery (br. of maxiallry, br. of external carotid).

"Nag, come up and dance with death!"
Eye to eye and head to head,

This shall end when one is dead;

Turn for turn and twist for twist--

Hah! The hooded Death has missed!"


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