Crainal bones Axial Skeleton

Question 1

How many bones in the Skull?

Answer 1

29 (22 plus inner 2 sets of 3 inner ear bones, Hyoid) 22+6+1=29

Question 2

What are the sub category’s of the skull?

Answer 2

Inner ear 6 (3 pairs of bones)
Facial 14 bones
Cranial 8 bones
Hyoid

Question 3

What are the 8 bones of the Cranium? hint 2 pairs and four single bones.

Answer 3

1. Occipital(posterior skull)
   2-3. R/L Partial(superior medial skull)sagittal suture
   4-5. R/L Temporal(lateral skull)squamous suture
2. Sphenoid(forms posterior wall of ocular orbit)
3. Ethmoid(forms medial wall of ocular orbit)
4. Frontal(forms forehead and superior wall of ocular orbit)

Question 4

What are the facial bones? hint 6 pairs and two single bones

Answer 4

1. Mandible(Jaw)
2. Vomer(between sphenoid bone posterior to palatine bone inferior view)
   3-4. R/L Maxilla(form anterior roof of mouth) Palatine process
   5-6. R/L Palatine(form posterior roof of mouth, and horizontal plate)
   7-8. R/L Zygomatic(form cheek and inferior lateral ocular orbit)
   9-10. Lacrimal(small posterior to the maxilla lateral to nasal)
   11-12. R/L Nasal(internasal suture)
   13-14. R/L Nasal Concha(form upper chamber of nasal cavity 3 pairs superior, medial, inferior)

Question 5

What are the names of the ear bones?

Answer 5

Malleus(Hammer), Incus(Anvil), Stapes(stirrup)

Question 6

How many bones in the Axial Skeleton?

Answer 6

80

Question 7

What are the sub categories of the Axial skeleton?

Answer 7

Skull (29)
Vertebra (26)
Thoracic cage (25) 24 Ribs 1 Sternum
29+26+25=80

Question 8

Some flat, all long and short, and most irregular bones will ossify via what type of ossification?

Answer 8

Endochondral

Question 9

How do Intramembranous and endochondral ossification differ?

Answer 9

Endochondral forms from Hyaline cartilage ossification.

Intramembranous forms within a fibrous membrane from sheets of mesenchymal cells.

Question 10

What is a Process, and what is its role?

Answer 10

Bump or projection, Attachment to other bone, tendon, or ligament

Question 11

What is a Trochanter, and what is its role?

Answer 11

Large rough projection, Attachments for tendons and ligaments

Question 12

What is a tubercle?

Answer 12

Small rounded projection

Question 13

Where would you find a Crest?

Answer 13

Prominent ridge (iliac crest = superior hip)

Question 14

What describes a Head?

Answer 14

Prominent rounded articular process

Question 15

What is a smooth rounded articular process?

Answer 15

Condyle (Occipital condyles articulate with atlas)

Question 16

A Fossa is?`

Answer 16

A shallow depression

Question 17

What describes a Sulcus?

Answer 17

A groove

Question 18

What is a tube shaped canal or passage way?

Answer 18

Meatus

Question 19

________ is an elongated opening?

Answer 19

Fissure

Question 20

Foramen?

Answer 20

Round opening for nerves/vessels

Question 21

What is a cavity within a cranial or facial bone that opens into the nasal cavity?

Answer 21

Sinus

Question 22

A Neck is?

Answer 22

Narrowing of bone adjacent to the head

Question 23

What is the thin flat region of the temporal bone found superior to the petrous portion and mastoid process?

Answer 23

Squamous portion

Question 24

What bones will you find on the squamous suture?

Answer 24

Superior Temporal, Inferior Parietal (lateral view)

Question 25

What do the Zygomatic process of the temporal bone and the Temporal process of the zygomatic bone come together to form?

Answer 25

Zygomatic arch (lateral view)

Question 26

The coronal suture connects?

Answer 26

Anterior part of the Parietal bone and the superior part of the Frontal bone

Question 27

What fissure is found within the Sphenoid bone?

Answer 27

Superior orbital fissure

Question 28

What are some features of the Temporal bone

Answer 28

``` Zygomatic process External acoustic meatus (ear hole) Mandibular fossa (connection to mandible) Mastoid process Petrous and squamous portions ```

Question 29

What are features of the Sphenoid bone?

Answer 29

Greater wing (foramen rotundum, ovale, spinosum) Lesser wing Sella turcica (cup for pituitary) Pterygoid plates (extending inferior from wings) Optic canal Superior orbital fissure

Question 30

What are some features of the Ethmoid bone and where is it located?

Answer 30

Medial orbit wall and superior nasal cavity Crista galli (helps to stabilize brain) Cribriform plate (olfactory nerves for smell) Perpendicular plate (superior nasal septum) Superior and Middle nasal concha