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60 Cards in this Set
- Front
- Back
What are the trhee depressions which make up the base of th einterior of the cranial cavity?
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Anterior, middle and posterior cranial fossae
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What three bones form the shallowest of the cranial fossae?
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Frontal bone
Ethmoid bone Sphenoid bone |
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What part of the frontal bone supports the frontal lobes of the brain?
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The orbital plates
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What is the midline protrusiono fht efrontal bone and projects into the left an dright cerbral hemispheres?
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The frontal crest
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What serves as the attachment point for the falx cerebri?
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The frontal crest
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What transmits through the foramen cecum?
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An emissary vein
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What is located at the base of the frontal crest?
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The forament cecum
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What is a sharp ridge of bone in the midline, psoterior to the frontal crest and formane ceum?
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Crista galli
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In addition to the attachment at the frontal crest where else does the falx cerebri attach?
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crista galli
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What gyrus lies laterally to the crista galli?
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The gyrus rectus
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What is a thin lamina of bone located on each side of th cresta galli?
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Cribiform plate
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What lies on the cribriform plate on each side.
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Olfactory bulb
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Where are the anterior and posterior ethmoidal foramina located?
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At the jucntion of the cribriform plate and the orbital plate of the frontal bone.
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What transmits through the anterior and posterior ethmoidal foramina?
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The anterior and posterior ehtmoidal nerves and vessels from the orbit to the anterior cranial fossa
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What is located medially, posterior to the cribriform plat and is the most anterior part of the boyd of the sphenoid bone.
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Jugum (Yoke of sphenoid)
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What extend laterally from the jugum?
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Extend laterally from the jugum
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What part of brain is supported for by the lesser wings?
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Posterior border of each lesser wing.
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Where does the lesser wing project into?
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Lateral sulcus of the cerebral hemisphere.
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What serves as the attachment for the free border ofthe tentorium cerebeli?
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Anterior Clinoid processes
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What are the two components of the cetnral part of the middle cranial fossa?
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The chiasmatic sulcus and sella turcica
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What forms the median elevation forming the posterior border of the chiasmatic sulcus?
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Tuberculum sellae
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What is the name of the depresion that houses the pitutary gland and is covered diaphrgma sellae?
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Hypophysial fossa
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What is the square plate o fbone projecting superiorly from the body fo the sphenoid?
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Dorsum sellae
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What provides the attacdhmen for the fixed border of the tentorium cerebeli?
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Posterior clinoid process
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What supports the temporal lobes of the cerebral hemispheres?
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The lateral part of the middle cranial fossa
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What three components form the lateral part of the middle cranial fossa (ant to post)?
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Greater wign fo the sphenoid bone
Squamous temporal bone Anterior face of the petrous temporal bone |
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What foramen is located between the two roots of the leser wing of the sphenoid and the boyd of the sphenoid?
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Optic canal
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What foramen is a large horizontal opening lcoated between the greater and lesser wings of the sphenoid?
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Superior Orbital fissure
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What structures transmit through the optic canal?
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The optic nerve (CN II) and the ophthalmic artery (from the carotid)
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What structures transmit through the superior orbital fissure?
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CN III (Oculomotor)
CN IV (Trochlear) Ophtahlmic nerve (CN V 1) CN VI (Abducens) Ophthalmic veins |
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What foramen is located in the greater wing of the sphenoid bone, posterior to the medial end of the superior orbital fissure?
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Foramen Rotundum
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What structure transmits through the foramen rotundum?
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The maxillary nerve (CN V 2)
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What foramen is located in the greater wing of the sphenoid bone, posterolateral to the foramen rotundum?
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Foramen ovale
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What structre transmits through the foramen ovale?
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The Mandibular nerve (CN V3)
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What foramen is located in the greater wing of the sphonoid bone, postero lateral to the foramen ovale?
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Foramen spinosum
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What structures transmit through the foramen spinosum?
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The middle meningela artery (greatest contributor to dura)
Mengingeal branch of V 3 |
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AFter Forament Spinosum Describe the course of the middle meningeal artery?
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After transmission, it courses in a groove on the floor and lateral wall of the middle cranial fossa.
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What foramen is located between the petrous temporal bone and the sphenoid bone and is closed by a cartilaginous plate in life.
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Foramen Lacerum
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What passes over the superior aspect of the cartilage in route ot the cavernous sinus?
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The Internal carotid artery (ICA)
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Describe the relationship between the greater and lesser petrosal nerves and the foramen lacerum.
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Posterolaterally along the anterior face of the petrous temporal bone
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Where is the trigeminal impression located?
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Posterior to the foramen lacerum on the anterio surface of the petrous temporal bone (near the apex)
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Where does the end of the carotid canal open into?
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The middle cranial fossa at the apex of the petrous temporal bone
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What is housed in the trigeminal impresssion?
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The trigeminal (semilunar) ganglion
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What are the four parts of the ICA?
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1st part: The Cervical part
2nd part: Petrous part 3rd part: Cavernous or Sigmoid part 4th part: Supraclinoid part |
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What is the largest and deepest of the cranial fossae?
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The posterior cranial fossa
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What are the components of the posterior cranial fossa?
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The occipital bone
parts of the temporal bone the posterior surface of the dorsum sellae of the sphenoid bone |
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What is a long flat slope of b one located anterior to the foramen magnum and is formed by the basilar portion of the occipital bone
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Clivus
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What supports the brainstem?
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The clivus
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What is a longitudinal ridge on the occipital bone; located posterior to the foramen magnum in the midline?
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Internal occipital crest
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What provides bony attachement for the falx cerebelli
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Internal occipital crest
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Where does the internal occipital crest end posteriorly?
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Internal occipital protuberance where the confluence of the sinuses are located.
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What is a pair of depressions in the occipital bone, posterior and lateral ot the foramen magnum?
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Cerebellar fossae
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What fossae makes up most of the floor of the posterior fossa?
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Cerebellar fossae
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What fossa (not posterior) houses the left and right cerebellar hemispheres?
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Cerebellar fossae
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What forms the anterolateral wall of the posterior cranial fossa?
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Posterior surface of the petrous temporal bone
Mastoid part of the temporal bone |
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What structures transmit via the foramen magnum?
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Brain stem
Spinal accessory nerve (CN XI) Vertebral arteries |
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What structures transmit via the internal acoustic meatus?
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CN VII (Facial)
CN VIII (Vestibulocochlear) |
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What foramen is located between the base of the petrous temporal bone and the occipital bone?
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Jugular foramen
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What structures transmit via the jugular foramen?
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CN IX (Glossopharyngeal)
CN X (Vagus) CN XI (Spinal accessory) Inferior petrosal sinus Jugular Bulb |
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What canal is located in the occipital bone, just above the anterolateral margin of the foramen magnum?
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Hypoglossal canal
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