Chapter 7/11

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How many bones in the skull?

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Skull and Facial Muscles

47 Terms

1

How many bones in the skull?

22

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2

How many bones in the cranium?

8

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3

How many bones in the face?

14

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4

What suture is formed by the two parietal bones?

Sagittal suture

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5

What suture is formed by the frontal and parietal bones?

Coronal suture

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6

What suture is formed by the occipital and parietal bones?

Lambdoid suture

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7

What suture is formed by the temporal and parietal bones?

Squamous suture

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8

What is the zygomatic arch?

Articulation between zygomatic bone/zygomatic process and temporal process/temporal bone

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9

What opening is on the frontal bone?

Supraorbital foramen

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10

What opening is on the parietal bone?

Parietal foramina

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11

What openings are in the temporal bone?

Carotid canal, external and internal acoustic meatus, mastoid foramen, stylomastoid foramen, jugular foramen (with occipital bone)

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12

What openings are in the occipital bone?

Foramen magnum, hypoglossal canal, jugular foramen (with temporal bone)

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13

What openings are in the sphenoid bone?

Foramen ovale, foramen rotundum, foramen spinosum, optic canal, superior orbital fissure, foramen lacerum (with temporal and occipital bones)

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14

What opening is on the ethmoid bone?

Cribriform foramina

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15

What cranial nerve passes through the cribriform plate?

Olfactory nerve (CNI)

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16

What nerve passes through the optic canal?

Optic nerve (CNII)

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17

What nerves pass through the superior orbital fissure?

  • Oculomotor nerve (CNIII)

  • Trochlear nerve (CNIV)

  • Ophthalmic nerve (CNV1)

    Abducens nerve (CNVI)

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18

What nerve passes through the foramen rotundum?

Maxillary nerve (CNV2)

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19

What nerve passes through the foramen ovale?

Mandibular nerve (CNV3)

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20

What nerves pass through the internal acoustic meatus?

  • Facial nerve (CNVII)

  • Vestibulocochlear nerve (CNVIII)

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21

What nerves pass through the jugular foramen?

  • Glosopharyngeal nerve (CNIX)

  • Vagus nerve (CNX)

  • Accessory nerve (CNXI)

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22

What nerve passes through the hypoglossal canal?

Hypoglossal nerve (CNXII)

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23

What are the functions of the paranasal sinuses?

  • Lighten skull

  • Mucous lining humidifies and warms inhaled air

  • Resonant chambers for sound production while speaking

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24

What bones form the superior border of the nasal complex?

Cribriform plate of ethmoid, parts of frontal and sphenoid

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25

What bones form the inferior border of the nasal complex?

Maxillae and palatine bones

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26

What bones form the lateral walls of the nasal complex?

Ethmoid, maxillae, inferior nasal conchae, palatine bones, and lacrimal bones

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27

What bones form the lateral wall of the orbit?

Zygomatic, greater wing of sphenoid, and frontal bones

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28

What bones form the posterior wall of the orbit?

Mainly sphenoid bone

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29

What bones form the medial wall of the orbit?

Maxilla, lacrimal, and ethmoid bones

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30

What bones form the floor of the orbit?

Mainly maxilla bone

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31

What bones form the roof of the orbit?

Frontal bone and lesser wing of sphenoid bone

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32

What are the features of the temporal bone?

  • Mandibular fossa

  • Mastoid air cells

  • Mastoid process

  • Petrous part

  • Styloid process

  • Squamous part

  • Zygomatic process

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33

What is the function of the mandibular fossa?

Articulates with mandible

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34

What is the function of mastoid air cells?

Lighten mastoid process

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35

What is the function of the mastoid process?

Attachment site of some neck muscles to extend or rotate head

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36

What is the function of petrous part?

Protects sensory structures in inner ear

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37

What is the function of styloid process?

Attachment site for hyoid bone ligaments and muscles

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38

What is the function of the squamous part?

Attachment site of some jaw muscles

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39

What is the function of the zygomatic process?

Articulates with zygomatic bone to form zygomatic arch

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40

What is the action of the buccinator?

Compresses cheek, holds food between teeth during chewing

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41

What is the action of the mentalis?

Protrudes lower lip

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42

What is the action of the orbicularis oris?

Compresses and purses lips

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43

What is the action of the risorius?

Retracts corners of mouth, as in a closed mouth smile

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44

What is the action of the zygomaticus major and minor?

Elevates corner of the mouth - smile

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45

What is the action of the corrugator supercilia?

Pulls eyebrows inferiorly and medially

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46

What is the action of the orbicularis oculi?

Closes eye; produces winking, blinking, squinting

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47
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