Temporal Bone

by Darren Salmi, MD, MS

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    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.

    About the Lecture

    The lecture Temporal Bone by Darren Salmi, MD, MS is from the course Skull.

    Included Quiz Questions

    1. Nasal
    2. Tympanic
    3. Mastoid
    4. Petrous
    5. Squamous
    1. External acoustic opening
    2. Mastoid foramen
    3. Mastoid process
    4. Mandibular process
    5. Zygomatic process

    Author of lecture Temporal Bone

     Darren Salmi, MD, MS

    Darren Salmi, MD, MS

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