Temporal Bone

00:02 The temporal bone is a bit complicated and has a lot of different parts.

00:07 So we can see even from the lateral view versus the medial view, there's going to be a lot of different processes.

00:14 The first part is something we already mentioned.

00:16 Which is a rounded portion to which a lot of muscles are going to attach called the mastoid part.

00:22 Then there's a tympanic part.

00:25 That's going to have something to do with hearing and the tympanic area or tympanic membrane.

00:31 And then we have the petrous part.

00:34 It's a very hard part petrous means rock like.

00:38 The flat part, again is called the squamous part.

00:44 We have the temporal surface.

00:46 Which is fairly flat.

00:48 But then we have this projection called the zygomatic process and this zygomatic process of the temporal bone.

00:54 Is going to merge with the temporal process of the zygomatic bone to form the zygomatic arch.

00:59 That can be a little confusing, but just remember that zygomatic arch is formed from two bones.

01:06 We have a little articular tubercle.

01:08 Because this is where the temporomandibular joint is going to attach.

01:14 And because it's going to participate with the mandible.

01:18 We have a fossa for the mandible called the mandibular fossa.

01:22 And again, we have the mastoid process.

01:24 And a small opening behind it called the mastoid foramen.

01:28 And we have the thinner sharper, styloid process.

01:33 And the external acoustic opening.

01:35 Which again is a passageway for the processing of sound.

01:40 If we look immediately from inside.

01:42 We see the internal acoustic meatus.

01:45 Basically continuing that canal.

01:48 We have the apex of the petrous portion of the bone there.

01:52 And again, we see the styloid process.

01:56 And from this side we see the internal opening of the mastoid foramen.

02:01 And we have a groove for another dural venous sinus called the sigmoid sinus.

02:06 The sigmoid sinus is getting close to its exiting portion where it eventually drains into the internal jugular vein.

02:13 Here from an inferior point of view.

02:15 We see that zygomatic process.

02:18 As it's reaching out towards the zygomatic bone to complete the zygomatic arch.

02:23 We have the little fossa for the head of the mandible called the mandibular fossa.

02:28 We again have that sharp process that pointy process called the styloid process.

02:35 And then more posterior the mastoid process.

02:37 And now we can see that there's a hole or foramen in between the two called the stylomastoid foramen.

02:44 And again posterior to the mastoid process.

02:47 Is the opening called the mastoid foramen.

02:50 More laterally we have the external acoustic meatus.

02:55 And we have a jugular fossa this time as it implies it's going to be related to the jugular vein.

03:03 And the carotid canal.

03:05 Which as the name implies, is going to have something to do with the carotid artery.