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Week 11
11/20
| Question | Answer |
|---|---|
| Q What four cranial bones form the floor of the temporal fossa? | A frontal, temporal, parietal, and great wing of the sphenoid? |
| Q What is another name for the junction of the four cranial bones which form the temporal fossa? | A Pterion |
| Q What is unique about the suture that form the pterion? | A the bones overlap instead of interlocking |
| Q What forms the superior/posterior border of the temporal fossa? | A There is none/it is open |
| Q The temporalis mm. is a powerful elevator of the mandible. What would the pos. fibers of this mm. also accomplish? | A pos. fibers can cause retraction of the mandible |
| Q The temporalis mm. is a powerful full elevator of the mandible. Aside from this action, what can the ant. fibers of this m. accomplish? | A ant. fibers may cause a small amount of protraction |
| Q What is unique about the insertion of the masseter mm.? | A It inserts directly into the ramus/tuberosity of the mandible. That means there isn't a confluence of fibers into a ligamentous attachment like usual. |
| Q Here's an easy one for you: What is the action of the masseter m.? | A Powerfull elevator of the mandible |
| Q What is the innervation of the masseter m.? | A the masseteris n., easy enough. Remember this is motor off CNV3 |
| Q What bone must be removed to visualize the infratemporal fossa? | A The RAMUS of the mandible. This is what we did in gross lab. You cut the coronoid process, condyloid process, and the angle of the mandible. |
| Q What is the sup border of the infratemporal fossa? What about the inf border? | A Sup= great wing of the sphenoid/infratemporal line (that's just what it sounds like it is), and inf = medial pterygoid m. [N4,55] |
| Q What n. passes through the foramen ovale? | A CNV3 |
| Q What BV gives major blood supply to the dura? Where does this BV enter the cranium? | A The middle meningeal a. enters the cranium through the foramen spinosum. [N71] |
| Q What is the middle meningeal a. a branch of? | A The first part of the maxillary a., which is a branch off the ext carotid a. [N71] |
| Q What are the ant/lat borders of the infratemporal fossa? | A ant = pos aspect of maxilla bone, and lat = int surface of mandibular ramus (this is before you cut it off to see the fossa) |
| Q What n. bifurcates around the middle meningeal a.? | A auriculotemporal n. [G884] |
| Q Does the internal carotid a. pass through the foramen lacerum? | A No, it only lays next to it. The internal carotid a. passes into the cranium via the carotid canal |
| Q What a./n. passes through the mandibular/alveolar foramen? | A This is on the medial side of the ramus of the mandible, and the inf. alveolar a./n. pass through it. |
| Q what n./a. passes through the infraorbital foramen? | A inf. orbital a. and CNV2 |
| Q At the sup. border of the ext carotid a., what two aa. does it branch into? Which is larger? | A Maxillary a. (larger), and superficial temporal a. |
| Q Which part of the maxillary a. is associated with the pterygoid m.? | A second/muscular/pterygoid part [G889] |
| Q What are the two major branches off the maxillary a. in the first/mandibular part? | A middle meningeal, and inf alveolar a. [G889] |
| Q What branches off the maxillary a. are associated with the first/mandibular part? | A middle meningeal, inf alveolar, deep auricular, ant. tympanic, and accessory meningeal |
| Q What a. off of the first part of maxillary a. supplies the external acoustic meatus? | A deep auricular artery |
| Q Which part of the maxillary a. occupies both the infratemporal fossa and the temporal fossa? | A The second/muscular/pterygoid part |
| Q What branches are found off the second part of the maxillary a.? | A going from prox to dist = pterygoid, masseteric, deep temporal, and buccal aa. |
| Q The pterygoid venous plexus lies between the temporalis m. and the lat. pterygoid m. . This provides communication between what two structures? | A The facial vein, and the cavernous sinus of the dura mater.[G794,890] |
| Q What ganglia is located just inferior to the foramen ovale? | A Otic/Arnold's ganglion (this is parasympathetic) [G886] |
| Q The glossopharyngeal n. uses what structure to carry it's sensory fibers to the parotid gland? | A The glossopharyngeal n. carries sensory to the parotid gland by means of the otic/arnold's ganglia. According to gray's, this looks to be accomplished by the auriculotemporal n. [G887] |
| Q What n. creates a loop around the middle meningeal a.? | A auriculotemporal n. |
| Q Sensory to the auricle and the TMJ are supplied by what n.? | A auriculotemporal a. |
| Q Just before entering the alveolar foramen with the inf alveolar a., what n. branches off, and what does it innervate? | A The mylohyoid n., which innervates the mylohyoid, and the ant. belly ofthe digastric m. [G885] |
| Q What are the two components of the lingual n.? | A CNV3, whose fibers innervate general sensory to the ant 2/3 of the tongue, and the Chordae tympani n. (from the facial) which gives special sensory to the ant 2/3 of the tongue. |
| Q Remember how CN 7 and 8 enter the ear, and 7 continues through? Where does it exit, as what, and where does it do? | A It exits the prterygotympanic fissure as the chorda tympani of the facial n. and heads for the tongue, and sublingual/submandibular glands. [G884-885] |
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GrossAnatomy1
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