Day 14 (pg 199)

Question 1

What bones converge to form the foramen lacerum?

Answer 1

the temporal, sphenoid and occipital bones

Question 2

What are the contents of the foramen lacerum?

Answer 2

the internal carotid artery, the carotid sympathetic nerve plexus, and a venous plexus

Question 3

What forms the roof of the posterior cranial fossa?

Answer 3

the tentorium cerebelli

Question 4

What part of the central nerve system occupies the posterior cranial fossa?

Answer 4

the cerebellum, pons, and medulla oblongata

Question 5

Which ostia will allow exit from the posterior cranial fossa?

Answer 5

the foramen magnum, the internal acoustic meatus, the jugular foramen, the hypoglossal canal and the condylar canal

Question 6

What are the contents of the internal acoustic meatus?

Answer 6

cranial nerves VII (facial nerve) and VIII (vestibulocochlear/ auditory nerve), the nervus intermedius/nerve of Wrisberg/sensory root of VII and the motor root of VII, the vestibular and cochlear roots of VIII and the internal auditory/internal labyrinthine artery and vein

Question 7

What are the contents of the jugular foramen?

Answer 7

the jugular bulb, the inferior petrosal sinus, the tympanic body/tympanic glomus or jugular body/jugular gloms, cranial nerves IX (glossopharyngeal), X (vagus) and XI (spinal accessory)

Question 8

What is the name of the venous expansion between the sigmoid dural venous sinus and the internal jugular vein?

Answer 8

the jugular bulb

Question 9

What is the function of the tympanic body/tympanic glomus

Answer 9

a chemoreceptive organ which monitors hypoxia, hypercapnia and increases in the hydrogen ion

Question 10

What are the contents of the condylar canal?

Answer 10

an emissary vein connecting the sigmoid dural venous sinus and the vertebral venous plexus

Question 11

What can the five layers of the scalp spell?

Answer 11

Skin, Connective tissue, Aponeurosis, Loose Connective Tissue, Periosteum…SCALP

Question 12

What are the principle sources of blood to the scalp?

Answer 12

internal carotid and external carotid artery branches

Question 13

What branches of the external carotid artery ramify in the scalp?

Answer 13

occipital, posterior auricular, and superficial temporal arteries…OPS

Question 14

What location will each branch of the fifth cranial nerve pass into upon exit from the middle cranial fossa?

Answer 14

ophthalmic nerve - orbit; maxillary nerve - pterygopalatine region; mandibular nerve - infratemporal region

Question 15

Which divisions of the trigeminal nerve receive sensory information from the scalp?

Answer 15

all 3 divisions; opthalmic nerve, maxillary nerve, & mandibular nerve

Question 16

What nerve(s) and cord levels of origin to the cervical plexus supply the scalp?

Answer 16

great auricular nerve - C2, C3 ventral rami branches; lesser occipital nerve - C2 (C3) ventral rami branches

Question 17

Which dorsal ramus nerve branch (name and cord level of origin) supplies the scalp?

Answer 17

greater occipital nerve - C2, C3 communicating ramus