Anatomy

Question 1

Epidermis layers

Answer 1

stratum...
Corneum
Granulosum
Lucidum
Spinosum
Basale

Question 2

Optic canal

Answer 2

(1) Optic nerve(
2) Ophthalmic artery
(3) Central retinal artery

Question 3

Superior orbital fissure

Answer 3

(1) CN III
(2) CN IV
(3) CN V1 branches
frontal nerve,
lacrimal nerve,
nasociliary nerve
(4) CN VI
(5) Superior ophthalmic vein (6) Inferior ophthalmic vein branch
(7) Middle meningeal artery (orbital branch)

Question 4

Inferior orbital fissure

Answer 4

CN V2 branches

zygomatic nerves, sphenopalatine branch

Question 5

Foramen rotundum

Answer 5

CN V2

Question 6

Foramen ovale

Answer 6

(1) CN V3
(2) Accessory meningeal artery
(3) Lesser petrosal nerve
(4) Emissary vein

Question 7

Foramen spinosum

Answer 7

Middle meningeal artery

Question 8

Foramen lacerum

Answer 8

(1) Cartilage
(2) Internal carotid artery
(3) Deep petrosal nerve
(4) Greater petrosal nerve
(5) Terminal branch of ascending pharyngeal artery
(6) Emissary vein

Question 9

Internal auditory canal (IAC)

Answer 9

(1) CN 7
(2) CN 8
(3) Labyrinthine artery

Question 10

Jugular foramen

Answer 10

Anterior
(1) inferior petrosal sinus
Middle
(2) CN 9
(3) CN 10
(4) CN 11
Posterior
(5) Internal jugular vein
(6) Meningeal branches from occipital and ascending pharyngeal arteries
(7) NodesofKrause

Question 11

Hypoglossal canal

Answer 11

(1) CN 12
(2) Emissary vein
(3) Lymphatics

Question 12

Foramen magnum

Answer 12

(1) CN 11
(2) Medulla
(3) Vertebral arteries
(4) Anterior and posterior spinal arteries

Question 13

SO4 LR6

Answer 13

CN 4: motor fibers for superior oblique muscle

CN 6: motor fibers for lateral rectus muscle; longest intracranial course of the cranial nerves

Question 14

CN 5 motor

Answer 14

Muscles of mastication: 
- temporalis
- masseter
- lateral and medial pterygoids
mylohyoid
anterior digastric
tensor tympani
tensor veli palatini muscles

Question 15

Jacobson’s nerve *tumor

Answer 15

CN 9 - tympanic branch (PARA pre - Visceral efferent)

From the inferior salivatory nucleus to tympanic plexus (leaves as lesser petrosal n) to the otic ganglion to the auriculotemporal nerve to the parotid gland

• Glomus tympanicum - neuroendocrine paraganglioma

Question 16

Arnold’s nerve *tumor

Answer 16

CN 10 - auricular / mastoid branch (somatic sensory)

• EAC and posterior auricle
• • referred pain from larynx
• ** rarely, cough reflex, syncope
• Glomus jugular - neuroendocrine paraganglioma

Question 17

AEA - PEA - ON relative distances

Answer 17

24 - 12 - 6

24 mm anterior lacrimal crest to AEA
12 mm AEA to PEA
6 mm PEA to ON

Question 18

Orbital bones

Answer 18

(1) maxillary
(2) frontal
(3) ethmoid
(4) zygomatic
(5) sphenoid
(6) palatal
(7) lacrimal

Question 19

Upper lid fat *whiter

Answer 19

Prelevator fat (2 fat pads)

medial *whiter
middle

Lateral - lacrimal gland

Question 20

Lower lid fat *IO position

Answer 20

Orbital fat (3 fat pads)

medial
*IO muscle
middle
lateral