Chapter 8: Skeletal System

Question 1

What is the highlighted area in the picture called?

Answer 1

Anterior cranial fossa

Question 2

What is the highlighted area in the picture called?

Answer 2

Middle cranial fossa

Question 3

What is the highlighted area in the picture called?

Answer 3

Posterior cranial fossa

Question 4

What is the most complex part of the skeleton?

Answer 4

Skull

Question 5

How many bones are in the skull?

Answer 5

22 bones- joined together by sutures (immovable joints)

Question 6

Name the cavaties in the skull

Answer 6

• cranial cavity (brain case)
• orbits (eye sockets)
• nasal cavity
• oral (buccal) cavity
• middle- and inner-ear cavities
• paranasal sinus

Question 7

Define foramina

Answer 7

holes that allow passage for nerves and blood vessels

Question 8

Paranasal sinuses

Answer 8

• Frontal
• Ethmoid
• Maxillary
• Sphenoid
  
  • Lined by mucous membrane and are air-filled

Act as chambers that add resonance to the voice; lighten the skull

Question 9

What is the region of the skeleton(picture) called?

Answer 9

Axial skeleton

Question 10

What is this section of the skeleton(picture) called

Answer 10

Appendicular skeleton

Question 11

What separates brain from bones?

Answer 11

Meninges(membrane)

Question 12

What is the thickest membrane? Where is it?

Answer 12

Dura mater in the cranium cavity(skull/spinal cord)

Question 13

What are the 2 parts of the cranial cavity?

Answer 13

1. calvaria (skullcap)
2. cranial base

Question 14

Cranial base is divided into three basins that comprise the cranial floor, what are they?

Answer 14

1. Anterior cranial fossa holds the frontal lobe of the brain
2. Middle cranial fossa holds the temporal lobes of the brain
3. Posterior cranial fossa contains the cerebellum

Question 15

Name the 8 cranial bones

Answer 15

• 2 temporal
• 1 frontal
• 2 parietal
• 1 occipital
• 1 sphenoid
• 1 ethmoid

Question 16

What’s up with the Frontal bone?

Answer 16

• Forms forehead and part of the roof of the cranium
  
  • Coronal suture—posterior boundary of frontal bone
• Supraorbital margin—ridge of bone deep to eyebrow
• Contains frontal sinus

Question 17

Remember something about the Parietal bone…

Answer 17

• Form most of cranial roof and part of its lateral walls
• Bordered by four sutures
  
  • Sagittal: between parietal bones
  • Coronal: at anterior margin
  • Lambdoid: at posterior margin
  • Squamous: at lateral border
• Two temporal lines for attachment of the temporalis muscle

Question 18

Where the temporal bone?

Answer 18

Lateral wall and part of floor of cranial cavity

Question 19

What are the 4 parts of the temporal bone?

Answer 19

1. squamous
2. tympanic
3. mastoid
4. petrous

Question 20

Where’s the squamous part(of temporal bone)?

Answer 20

• Encircled by squamous suture
• Zygomatic process
• Mandibular fossa

Question 21

Where’s the tympanic part(of temporal bone)?

Answer 21

• External auditory meatus
• Styloid process

Question 22

Where’s the mastoid part(of temporal bone)?

Answer 22

Mastoid process

Question 23

Where’s the petrous part(of temporal bone)?

Question 24

Where’s the occipital bone?

Answer 24

• Rear and base of skull
• Foramen magnum opening for spinal cord
• Occipital condyles—knobs resting on spinal column
• Superior and inferior nuchal lines for neck muscle attachment

Question 25

Where’s the sphenoid bone?

Answer 25

• Body
• Greater wing
• Lesser wing
• Optic canal
• Sella turcica
• Sphenoid sinus

Question 26

Where’s the ethmoid bone?

Answer 26

• Located between eyes
• Contributes to medial wall of orbit, walls and roof of nasal cavity, and nasal septum

Question 27

Where’s the perpendicular plate?

Answer 27

Forms superior two-thirds of nasal septum

Question 28

Where’s the cribriform plate?

Answer 28

Forms roof of nasal cavity