Nuro Cranium 3-4

Question 1

PARIETAL BONES borders

Answer 1

Sagittal margin (for sagittal suture) 
Frontal margin (for coronal suture) 
Occipital margin (for lambdoid suture) 
Squamous margin(for squamosal suture)

Question 2

Angles of parietal bones

Answer 2

Frontal angle (anterosuperior)
Sphenoidal angle
Occipital angle (posterosuperior)
Mastoid angle

Question 3

External surface

Answer 3

Parietal tuberosity (tuber), parietal eminence
Parietal foramen
Superior temporal line
Inferior temporal line

Question 4

Internal surface of parietal

Answer 4

Groove for middle meningeal artery
Groove for superior sagittal sinus
Groove for sigmoid sinus

Question 5

Passes through the foramen magnum

Answer 5

➢ Spinal cord
➢ Meningeal branches of C1-C3 spinal nerves
➢ Vertebral artery
➢ Spinal part of accesory n.
➢ Internal vertebral venous plexus

Question 6

Parts of occipital bones

Answer 6

1.Squamous part
2.Basilar part
3+4.Condylar (lateral) part

Question 7

Squamous part split into

Answer 7

Internal and external surfacek

Question 8

External surface of squamous part

Answer 8

• External occipital protuberance (prominent post. projection)
(INION)
• Planum occipitale
• Superior nuchal line
• Planum nuchale (rough, irregular)
• Inferior nuchal line
• External occipital crest

Question 9

Internal surface of occipital squama

Answer 9

• Cruciate eminence
• Cerebral fossa
• Cerebellar fossa
• Internal occipital protuberance
• Internal occipital crest
• Groove for superior sagittal suture
• Groove for transverse sinus
• Groove for occipital (sigmoid) sinus

Question 10

Shape of Internal surface of occipital

Answer 10

deeply concave, divided into four fossae

Question 11

Sphenoccipital synchondrosis

Answer 11

Joins the basiliar part with the body of sphenoid

Question 12

Basilar part

Answer 12

• Clivus
• Pharyngeal tubercle
• Groove for inferior pertrosal sinus

Question 13

2. Lateral part

Answer 13

• Mastoid border
• Occipital condyle
• Condylar canal
• Hypoglossal canal
• Condylar fossa
• Jugular notch

Question 14

Temporal bone

Answer 14

• Squamous part (Pars squamosa)
• Petromastoid part (Pars petromastoidea)
• Tympanic part (Pars tympanica)
• Styloid process (Proc. styloideus)

Question 15

Squamous part

Answer 15

• Parietal border
• Sphenoidal margin
• Parietal notch
• Temporal surface : 
Groove for middle temporal artery
• Zygomatic process:
 Supramastoidcrest
 Foveola suprameatica
• Articular surface
• Articular tubercle
• Petrosquamous fissure
• Cerebral surface: Groove for middle meningeal vessels
.Mandibular fossa

Question 16

Carotid canal

Answer 16

Internal opening of carotid canal

External opening of carotid canal

Question 17

Inferior surface of petrous part

Answer 17

➢ Musculotubal canal
▪ Semicanal for tensor tympani
▪ Semicanal for auditory tube
➢ Jugular notch
➢ Styloid process
➢ Stylomastoid foramen

Question 18

Anterior surface of petrous part

Answer 18

➢ Tegmen tympani
➢ Arcuate eminence
➢ Hiatus for greater petrosal nerve
➢ Groove for greater petrosal nerve
➢ Hiatus for lesser petrosal nerve
➢ Groove for lesser petrosal nerve
➢ Trigeminal impression
➢ Petrous ridge
➢ Groove for superior petrosal sinus

Question 19

Posterior surface of petrous part

Answer 19

➢ Internal acoustic meatus ( Facial n.,vestibulocachlear n., labrynthi a.)
➢ Posterior border of petrous part
➢ Groove for inferior pertrosal sinus
➢ Petrosal fossula
➢ Bony tympanic cavity

Question 20

2. Tympanic part

Answer 20

• External acoustic meatus
• Tympanic sulcus
• Mandibular fossa
• Petrotympanic fissure
• Tympanic notch
• Tympanosquamous fissure
1. Petrosquamous fissure
2. Petrotympanic fissura
• Tympanomastoid fissure
.Vagina of styloid process
.Canaliculus for tympanic nerve