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Re: True/False - Skull lecture 2013

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Posted by lae2 on September 25, 2013 at 21:48:33:

In Reply to: Re: True/False - Skull lecture 2013 posted by Caitlin McMenamin on September 25, 2013 at 20:46:59:

: : True/False - Skull lecture 2013
: : These questions were not submitted by the lecturer

: : 1. The pterion is so named in reference to a prehistoric bird having a greater wing. Perhaps a pterodactyl.

: true!!!!! caw caw
Agree. :)

: : 2. The parietal foramina transmit emissary veins.

: true- the parietal foramina transmit veins that drain the scalp and drain into the superior dural sinus.
Agree. The superior sagittal sinus.

: : 3. The parietal foramina provide communication between the region of the scalp and the cranium.

: true- as stated above through veins

: : 4. The condylar canal transmits the hypoglossal nerve and the hypoglossal canal transmits the condylar emissary vein.

: false- the hypoglossal canal (anterior to the condyle that articulates with C1) transmits the hypoglossal nerve. the condylar canal (posterior to the condyle that articulates with C1) transmits the occipital vein (?)
Agree. The condylar canal transmits the condylar emissary vein and, thus, provides a venous communication between the external posterior vertebral plexus and the sigmoid sinus. There may also be tributaries to the marginal sinus and the posterior internal vertebral venous plexus. The condylar canal can be confused with the hypoglossal canal. The condylar canal runs longitudinal to the condyle and the hypoglossal canal is orthogonal to the condyle. Further the condylar canal is often unilateral. The hypoglossal canal is bilateral and symmetrical. Please demonstrate this on the skull.

: : 5. The jugular canal transmits the common carotid artery into the skull.

: false- the jugular canal transmits the internal jugular vein into the skull
Agree. The common carotid artery does not enter the skull. The internal carotid artery enters the skull by the carotid canal.

: : 6. The petrotympanic fissure transmits the tympanic branch of the glossopharyngeal nerve.

: false- it transmits the tympanic branch of the maxillary nerve
No. The petrotympanic fissure transmits the chorda tympani branch of the facial nerve (see the colored handout). The tympanic canaliculus transmits the tympanic branch (recurrent tympanic nerve) of the glossopharyngeal nerve.

: : 7. The continuation of the facial nerve into the parotid region is by way of the stylomastoid foramen.

: true- the facial nerve exits the skull at the stylomastoid foramen to travel through the parotid gland and then split to innervate muscles of the face
Agree. Except, in addition there are sensory branches (GSA) to the posterior ear. See colored handout.

: : 8. The stylomastoid foramen provides communication between the facial canal of the occipital bone and the infratemporal fossa.

: false- should be facial canal of the temporal bone
agree.

: : 9. The epicranial aponeurosis (galea) is the intertendon of the occipitofrontalis muscle.

: true
Agree. Know about compromise of the epicranial aponeurosis in the context of spread of infection.

: : 10. The dura mater of the cranial cavity, unlike in the spinal canal, is adhered to the endosteum. Thus, there is not an epidural space.

: true
Agree. Nevertheless, an epidural hematoma may lift the dura matter from the endosteum and claim intracranial space. So much so that the brain herniates through the foramen magnum and the tentoral incisure "bites" into the brainstem. Death.




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