Skull Bones

Question 1

What are the immovable joints in the skull called?

Answer 1

• Sutures

Question 2

What is the main function of the skull?

Answer 2

• to protect the brain

Question 3

How many cranial bones are there?

Answer 3

• 8

Question 4

How many facial bones are there?

Answer 4

• 14

Question 5

What are the names of the eight cranial bones?

Answer 5

• Frontal bone
• Parietal bones (2)
• Temporal bones (2)
• Occipital bone
• Sphenoid bone
• Ethmoid bone

Question 6

What does the frontal bone form?

Answer 6

• the forehead
• the anterior portion of the cranial cavity
• part of each orbit (eye socket)

Question 7

What are some features of the frontal bone?

Answer 7

• supraorbital margin (2)
• supraorbital foramen (2)
• both are near the eyebrow or top of eye socket

Question 8

What do the parietal bones form?

Answer 8

• the top and upper part of the sides of the head
• most of the superolateral portion of the cranial cavity
• the lower part of the sides of the head (temples)
• most of the inferolateral portion of the cranial cavity

Question 9

What are some features of the temporal bones?

Answer 9

• Styloid process
• Mastoid process
• Stylomastoid foramen
• Carotid foramen
• Jugular foramen
• Zygomatic process
• Mandibular fossa
• External auditory meatus
• Internal auditory meatus

Question 10

What are the three areas of the ear?

Answer 10

• inner ear
• middle ear
• outer ear

Question 11

What is the scientific name for the “eardrum”?

Answer 11

• tympanic membrane

Question 12

What is the opening between the middle ear and inner ear known as?

Answer 12

• the oval window

Question 13

What are the three little bones in the ear?

Answer 13

• malleus
• incus
• stapes

Question 14

What bone is attached to the tympanic membrane?

Answer 14

• the malleus

Question 15

What bone is attached to a membrane covering the oval window?

Answer 15

• the stapes

Question 16

What are the smallest bones in the body?

Answer 16

• auditory ossicles

Question 17

What does the occipital bone form?

Answer 17

• The back of the head

- The posteroinferior portion of the cranial cavity

Question 18

What are some features of the occipital bone?

Answer 18

• Foramen magnum
• Occipital condyle (2)
• External occipital protuberance
• Superior nuchal line (2)
• Inferior nuchal line (2)

Question 19

What does the sphenoid bone form?

Answer 19

• The middle part of the inferior portion of the cranial cavity
• Part of each orbit
• Part of the nasal cavity

Question 20

What does the word Sphenoid mean in greek?

Answer 20

• wedge

- “keystone” to the cranial floor since it articulates with all of the other cranial bones

Question 21

What are some features of the Sphenoid bone?

Answer 21

• Body
• Sella turcica (“Turkish saddle”)
• Sphenoid sinus
• Greater wing (2)
• Lesser wing (2)
• Pterygoid process (4)
• Optic foramen (2)
• Superior orbital fissure (2)
• Foramen ovale (2)
• Foramen rotundum (2)

Question 22

What does the ethmoid bone form?

Answer 22

• Part of the anteroinferior portion of the cranial floor
• Part of each orbit
• Part of the border of the nasal cavity

Question 23

What does the word ethmoid mean in greek?

Answer 23

• “sieve-like”

- sponge-like in appearance with lots of small cavities

Question 24

What are some features of the ethmoid bone?

Answer 24

• Cribiform plate
• Olfactory foramina
• Crista galli
• Perpendicular plate
• Lateral mass (2)
• Ethmoidal sinuses
• Superior nasal concha (2)
• Middle nasal concha (2)

Question 25

What are the 14 facial bones?

Answer 25

- Nasal bone (2) - Lacrimal bones (2) - Zygomatic bones (2) - Maxillae (2) - Palatine bones (2) - Vomer - Inferior nasal conchae (2) - Mandible

Question 26

What does the zygomatic arch consist of?

Answer 26

- Temporal process of the zygomatic bone | - Zygomatic process of the temporal bone

Question 27

What bones form the hard palate?

Answer 27

- palatine process of the maxilla and horizontal plate of palatine bone (2)

Question 28

What is a feature of the maxillae?

Answer 28

- infraorbital foramen

Question 29

What are some features of the mandible?

Answer 29

- Mandibular foramen (2) - Coronoid process (2) - Mandibular notch (2) - Condylar process (2) - Ramus, angle, body of mandible

Question 30

What are the movable bones in the skull?

Answer 30

- mandible | - auditory ossicles

Question 31

What bones are in the roof of the orbits?

Answer 31

- Frontal bone | - Sphenoid bone

Question 32

What bones are in the lateral wall of the orbits?

Answer 32

- Zygomatic bone | - Sphenoid bone

Question 33

What bones are in the medial wall of the orbits?

Answer 33

- Maxilla - Lacrimal bone - Ethmoid bone - Sphenoid bone

Question 34

What bones are in the floor of the orbits?

Answer 34

- Maxilla - Zygomatic bone - Sphenoid bone

Question 35

What bones form nasal septum?

Answer 35

- perpendicular plate of ethmoid bone - vomer bone - septal nasal cartilage

Question 36

What is the function of the paranasal sinuses?

Answer 36

- to decrease the weight of the skull and increase the surface area of the nasal mucosa (moisten/clean inhaled air)

Question 37

What bones have sinuses?

Answer 37

- frontal bone - sphenoid bone - ethmoid bone - maxillae

Question 38

Where is the hyoid bone located?

Answer 38

- the anterior neck between the mandible and larynx

Question 39

Whats a fun fact about the hyoid bone?

Answer 39

- it does not articulated with any other bone

Question 40

What is the purpose of the hyoid bone?

Answer 40

- provides attachment sites for muscles of the tongue, pharynx, and anterior neck