Lecture 21 - Skull and Cranial Nerves I Flashcards Preview

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Flashcards in Lecture 21 - Skull and Cranial Nerves I Deck (46):
1

What is the neurocranium?

Braincase

2

What is the function of the neurocranium?

Protect the brain

3

What is the facial skeleton called?

Splanchnocranium

4

What is the function of the splanchnocranium?

Face, sensory components, and masticatory apparatus

5

What are the three dorsal bones of the neurocranium?

Frontal, parietal, and the interparietal portion of the occipital

6

What is different about the frontal and parietal bone?

Both are bilaterally symmetrical

7

What is the function of the temporal fossa/line?

Contains the temporal muscle and fascia

8

What are the four ventral bones of the brain case?

Presphenoid, pterygoid, basisphenoid, and occipital

9

What canal is within the occipital bone?

Hypoglossal canal

10

What canals are within the basisphenoid bone?

Optic canal, Foramen rotundu, Foramen ovale, and Hypophyseal fossa

11

What are pterygoid processes?

Ventral projections of basisphenoid

12

What fossa are located within the temporal bone?

Mandibular fossa and stylomastoid foramen

13

What six bones line the brain cavity?

Occipital, parietal, frontal, petrous temporal, basisphenoidm and presphenoid

14

What does the neurocranium contain?

Cranial cavity

15

What are the two types of bone in the neurocraninal bones?

Compact and trabecular

16

What is compact bone?

Inner and outer tables, inner usually thiner

17

What is trabecular bone?

Between inner and outer tables of compact bone, contain red bone marrow

18

What is diploic bone?

Spongy bone between flat cranial bones

19

What are sutures in the skull made up of?

Sharpey's fibers (type 1 collagen)

20

What do the sharpey's fibers do?

Connect periosteum to the bone, provides strength and absorbs bone strain across suture

21

What happens when equines fall on their poll?

Basisphenoid fractures and avulsion of the longus capitus
Possible acute optic nerve damage

22

What are the three types of skull fractures?

Depressed - Linear - Comminuted

23

What is a depressed skull fracture?

Fragment of bone is depressed inward to compress or injure the brain

24

What is a linear fracture?

Usually occur at the point of impact, with fracture lines radiating away in two or more directions

25

What is a comminuted fracture?

Bone is broken into several pieces

26

What is the rostrum portion of the skull made up of?

Premaxilla, maxilla, palatine, nasal, lacrimal, and portions of the frontals and zygomatics

27

What is the hard palate made up of?

Premaxilla, maxilla, palatine, upper portion of "dental battery"

28

What is within the nasal choane?

Nasal conchae

29

What are nasal conchae?

Thin, scroll-like bones that are covered with repiratory and nasal epithelia

30

What makes up the bony orbit?

Zygomatic, lacrimal, frontal, maxilla, and palatine

31

What ligament is with in the orbit of the eye?

Postorbital ligament

32

What is the floor of the orbit formed by?

Processes of zygomatic, maxilla, and palatine

33

What is the zygomatic arch?

Formed via the temporal process of the zygomatic bone and the zygomatic process of the temporal bone

34

What muscle's origin is the zygomatic arch?

Masseter muscle (ventral edge of the zygomatic arch)

35

What does the mandible articulate with?

Temporal, at the temporomandibular joint

36

What is within the mandible?

Lower dental battery

37

What foramen are within the mandible?

Mental foramina and mandibular foramen

38

What does CN I exit out of?

Cribiform plate

39

What does CN V1 exit out of?

Maxillary foramen

40

What does CN II exit out of?

Optic canal

41

What does CN XII exit out of?

Hypoglossal canal

42

What does CN IX, X, and XI exit out of?

Jugular foramen

43

What does CN VII and VIII exit out of?

Internal acoustic meatus

44

What does CN III, IV, and VI exit out of?

Orbital fissure

45

What does CN V2 exit out of?

Round foramen

46

What does CN V3 exit out of?

Oval foramen