 This is a supine cadaver. We are showing the right side. I'm narrating from the right side and the camera person is also on the right side This is going to be a demonstration of the infratemple fossa. In order to reach the infratemple fossa We first cut the zygomatic arch. So therefore this was filled by the zygomatic arch Then we cut the promise of the mandible just before its angle This is my cut portion of the mandible with the cornoid process and the temporalis muscle attached to it We disarticulated the temporal mandibular joint and we reflected it up. This is the parotid duct We pushed it from under the parotid duct and we reflected the meseter muscle from the mandible Before reflecting the mandible itself and that's how we reach the infratemple fossa Because if you note the infratemple fossa the lateral boundary of the infratemple fossa is formed by the ramus of the mandible So therefore in order to see it we have to remove the lateral boundary Incidentally the lateral boundary of the temporal fossa is the zygomatic arch So therefore to see it more clearly we have to remove the lateral boundary of the temporal fossa also So now we can see the infratemple fossa. We have already mentioned the lateral boundary The medial boundary of the infratemple fossa is the lateral plate of pterigoid which is covered by this muscle This is the medial pterigoid muscle and this is the lateral pterigoid muscle The anterior boundary of the infratemple fossa is the posterior surface of the maxilla The posterior boundary of the infratemple fossa is where my finger is located The mastoid process, styloid process Roof of the infratemple fossa is the intratemporal surface of the greater wing of sphenoid The floor of the infratemple fossa is where the medial pterigoid gets attached to the angle of the mandible on the inner surface And my finger is located there. So these are the boundaries of the infratemple fossa This is a skeleton of the skull base to show the infratemple fossa and the boundaries which we described just now Now let's take a look at the contents We will divide the contents into the muscles the nerves the arteries the weights And a few other structures Muscles are this one. This is the lateral pterigoid muscle. This is the next one. This is the medial pterigoid muscle Then we have the insertion of the temporalis muscle to the cornoid process That much is the content of the intratemporal fossa coming to the artery. The most important structure is this one here This is the maxillary artery which i'm going to describe just now coming to the nerve This is mandibular division of trigeminal nerve with its branches which i'm going to describe Then which is not visible in a cadaver dissection There will be a venous plexus and that is known as the pterigoid venous plexus in a cadaver The veins get completely collapsed and they get drained off. So therefore they are not visible This whole thing was filled with fat which has also been cleared of and additionally on the medial side of the mandibular nerve Will be the ottic ganglion and there will also be the lesopetrocell nerve and the corno timpani nerve So these are the full contents of the intratemporal fossa. Having mentioned this Let me elaborate on some important neuro vascular structures that we can see here Let's start with this one. This is the continuation of the external carotid artery An external carotid artery as it goes up it enters the carotid gland and this is the carotid gland Here inside it divides into these two branches this branch which i have picked up here This is the maxillary artery, which is the larger terminal division of the external carotid and this is the next branch This is the superficial temporal artery, which is the smaller terminal division And we can see the other end of the superficial temporal artery here When I exert traction here, we can see this pulling here So this is the smaller terminal division superficial temporal artery runs through the carotid gland And it supplies the skin of the temporal region by means of the frontal and paracal branches Let's take a look at the maxillary artery, which is the content of the intratemporal fossa The maxillary artery has got two three parts The first part is lateral to the lateral teregoid and that is known as the mandibular part The second part in normal circumstances is superficial to the lateral teregoid But in this particular endeavor it is deep to the granite teregoid and that is known as the teregoid part The third part is not in the intratemporal fossa, it goes through the terego maxillary fissure into the terego palatine fossa So therefore we can see the first part and the second part of the maxillary artery And this is the one which I picked up here. The first part of the maxillary artery has got five branches Many branches are very small. We can see only one branch and that is this branch, which I have lifted up here This is the middle meningeal artery The middle meningeal artery runs in the intratemporal fossa and it goes through the foremen spinalisum And it enters the cranial cavity and it supplies the meninges And this is the one which runs on the inner surface of the tereon And the fracture of the tereon can rupture the middle meningeal artery leading to extra neural hematoma, which can be life threatening This is a CT scan of the head to show fracture of the tereon on the left side with rupture of the middle meningeal artery and EDH Not visible here, but just media to that will be the accessory meningeal artery Which enters the cranial cavity through the foremen ovary And before the middle meningeal artery and the accessory meningeal artery There'll be a deep auricular anterior tympanic branches Which supplies the external tributaries and the tympanic membrane and finally there will be one branch Which is again not visible here, but which will be running with the inferior alveolar nerve That's the inferior alveolar artery, which supplies the lower jaw and the lower teeth So these are the five branches which come out from the first part The second part as I said in most cases are located on the surface of the lateral teregoid But really it can be deep to the lateral teregoid and in this case We can see that it is deep to the lateral teregoid. The second part gives four branches All of them are muscular branches, temporal branch, the mesiatric branch, buccal branch and teregoid branches So these are the two parts of the meningeal artery The whatever branches that we can see in the infratemple fossa The next important structure that we can see in the infratemple fossa is this one which I have picked up This is mandibular division of trigeminal nerve and we have dissected it right up to the base of the skull And the membrane instrument has disappeared. That is the region of the foramen ovale So the mandibular division cn5 v3 comes into the infratemple fossa through the foramen ovale And here it gives the following branches This is the buccal branch It passes between the two heads of the lateral teregoid and it supplies the cheek This is a cutaneous branch. Then we have this branch here. This is the lingual nerve The lingual nerve goes to the floor of the mouth It supplies the structures in the floor of the mouth and it supplies the tongue The next branch is this one here This is the inferior alveolar nerve and the small branch just below that is the nerve to mylohyoid And we can see the nerve to mylohyoid also The inferior alveolar nerve through its dental and incisive branches supplies the lower teeth And the nerve to mylohyoid supplies a muscle in the floor of the mouth called the mylohyoid muscle And the next branch that we can see is this one here. This is the auriculotemporal nerve The auriculotemporal nerve carries secretive motor fibers Which came from the autech ganglion. The autech ganglion is located on the medial surface Therefore we cannot see and the auriculotemporal nerve carries secretive motor post ganglionic fibers to the parotid gland And after that the auriculotemporal nerve becomes cutaneous And it runs with the superficial temporal artery And I picked up the superficial temporal artery with one instrument And I picked up the auriculotemporal nerve with the other instrument And the auriculotemporal nerve then runs onto the temporal region and it supplies the skin in this region So these are the branches of the mandibular nerve that we can see here The best way to remember it is to remember it like a cross Or a T. Mandibular nerve giving this branch here This is the buccal branch Giving the lingual branch inferior alveolar nerve to mylohyoid Auriculotemporal And while we are on this topic, we can also see one more branch of the mandibular and that is this one here This is the deep temporal branch Which supplies the temporalis muscle. It also gives branches to the vaseter It gives branch to the temporal mandibular joint It gives branches to the lateral teregoid and medial teregoid So these are the full distribution of the Contents of the infertile temporal fossa Thank you very much for watching Dr. Sanjay Sanyal signing out. Please like and subscribe if you have any questions or comments Please put them in the comment section below. Have a nice day