The anatomy of the scalp and innervation of the head

Question 1

scalp infection could spread where

Answer 1

osteomyelitis

meningitis

Question 2

which is the most dangerous layer of the scalp if infection is present

Answer 2

loose areolar layers - blood and pus spread easily here through emissary veins to major cerebral sinuses

Question 3

what dermatome innervates left side of occiput

Answer 3

C2
C3 neck
C4 back neck

Question 4

mandibular nerve leaves skull from what foramen

Answer 4

foramen ovale

also supplies addiotnal to chin, muscle of mastication and sensation via inferior alveolar to chin, auriculotmproal to parotid gland and skin
lingual to antihero 2/3 of tongue
buccal to lateral gangiva and inner cheek

Question 5

where do each cranial nerve nuclei belong

Answer 5

C1-4 midbrain
5-8- pons
9-12 medulla

Question 6

CN1 is contained the anterior cranial fossa

what is contained in the middle cranial fossa

Answer 6

CN2-6

Question 7

ophthalmic nerve functions

Answer 7

sensation
pupillary dialtion ( sympthatic )
lacrimiantion ( para)

Question 8

maxillary nerve function

Answer 8

sensation via infraorbital nerve and superior alveolar nerve

para for zygomatic, nasoplatine, great and lesser palatine and phyangeal nerve

fromamen rotundum

Question 9

facila nerve functions

Answer 9

muscles fo facial expression 
stapedius and posterior belly of digastric 
lacrimiantion - grette petrosal 
submandibular glands 
taste via chord tympani

Question 10

80yr old man weakness of right side of face with taste preserved where is the most likely lesion

Answer 10

parotid gland ( taste is preserved therefore likely to lie below point at which chorda tympani leaves

Question 11

how can disease pass from the 5th nerve to 7th nerve

Answer 11

viridian’s nerve ( joins VII to Vb)

chorda tympani ( joins 8 to Vc/lingual nerve)