Exam II Lecture IV

Question 1

Bones of the base of the skull

Answer 1

Endochondral

Question 2

Bones forming sides and roof of skull

Answer 2

Dermal bones

Make up bones of face

Question 3

Chondrocranium

Answer 3

Cartilagenous embryonic skull
Includes capsules housing sensory organs
-Olfactory
-Optic
-Otic

Question 4

Only basicranial bone that is entirely preformed in cartilage

Answer 4

Ethmoid

Question 5

Components of ethmoid

Answer 5

Cribriform plate
Crista galli
Perpendicular plate
Labrynth - superior/inferior conchae 
Ethmoid air cells

Question 6

Crista galli is attachment for

Answer 6

Falx cerebri

Question 7

Sphenoid formed from

Answer 7

Both cartilage and dermal elements

Question 8

Components of sphenoid

Answer 8

Pterygoid plates medial/lateral
Hypophyseal fossa (body)
Four clinoid processes joint by dorsum sellae

Question 9

Greater wings lower flaps of sphenoid

Answer 9

Contribute to floor of middle cranial fossa

Foramen rotundum, ovale, spinosum

Question 10

Greater wings upper flaps sphenoid

Answer 10

Foraminae contain optic canal and anterior clinoid process

Question 11

Middle cranial fossa is location of

Answer 11

Temporal lobes

Question 12

Foramina spinosum has what running through it

Answer 12

Middle meningeal vessels

Question 13

Temporal bones components

Answer 13

Petrous part
Mastoid process
Styloid process
Squamous part
Tympanic part

Question 14

Styloid process derived from/fuses to

Answer 14

Derived from second gill arch

Fuses to petrous portion in front of mastoid

Question 15

Petrous parts of temporal bones

Answer 15

Surrounds ear apparatus
Forms middle ear chamber
Forms eustachian tube
Forms carotid canal

Question 16

Squamous part of temporal bones

Answer 16

Thin sheet of dermal bone forming lateral wall of braincase above auditory meatus

Question 17

Tympanic part of temporal bones

Answer 17

Forms a ring of dermal bone around eardrum

Becomes external auditory meatus

Question 18

Occipital bone squamous part

Answer 18

Dermal bone that forms lower back of head

Question 19

Occipital bone basilar part

Answer 19

Corms four bones that fuse around spinal cord to form foramen magnum which is for:
-passage of spinal cord/vertebral arteries/spinal root of XI

Question 20

Frontal bone

Answer 20

Paired in fetus, fused in adult

Supraorbital foramina

Question 21

Maxillary bone

Answer 21

Alveolar processes

Infraorbital foramina

Question 22

Anterior skull consists of

Answer 22

Sphenoid greater/lesser wings
Ethmoid
Lacrimal
Vomer

Question 23

Anterior cranial fossa formed by

Answer 23

Frontal bone

Question 24

Anterior cranial fossa features, contains

Answer 24

Features crista galli, cribriform plate, olfactory foramina

Contains- frontal lobes of cerebellum

Question 25

Middle cranial fossa formed by

Answer 25

Body and greater wings of sphenoid

Question 26

Middle cranial fossa features

Answer 26

Foramen rotundum, ovale, spinosum, lacerum

Question 27

Middle cranial fossa contains

Answer 27

Temporal lobes of cerebrum

Question 28

Posterior cranial fossa formed by

Answer 28

Occipital bone

Question 29

Posterior cranial fossa features

Answer 29

Jugular foramen

Hypoglossal, condylar, mastoid canals

Question 30

Posterior cranial fossa contains

Answer 30

Cerebellum, pons, medulla