Flashcards in Anatomy of the Pituitary Gland Deck (26)
What do the thalamus and hypothalamus make up?
Where in the brain can the diencephalon be found?
central core of cerebrum
Connects to R+L hemispheres and midbrain
What 3 areas make up the brainstem?
What connects the hypothalamus to the pituitary?
What division of the pituitary gland is connected to the hypothalamus?
What embryological structure eventually develops into the anterior pituitary gland?
From Ectoderm (=> glandular tissue)
What embryological structure eventually forms the posterior pituitary?
From NEURAL ectoderm (=> neural tissue)
What tumour is commonly found in the anterior pituitary gland?
What 3 sections make up the anterior lobe of the pituitary gland?
What section makes up the posterior pituitary
Where is the pituitary gland located in the brain?
midline structure in pituitary fossa of sphenoid bone
What does the pituitary gland lie immediately inferior to?
What makes up the optic chiasm?
right & left optic nerves (CN II)
Light entering what part of the retinae causes it to cross to the opposite occipital lobe?
=> light coming from temporal visual field
If a tumour grows from the pituitary and interrupts conduction at the optic chiasm, what can this cause?
Loss of vision in the temporal fields
=> Bitemporal Hemianopia
How can a pituitary tumour be removed surgically?
Transcranial approach (subfrontal–under frontal lobe)
Transsphenoidalapproach (via nasal cavities & sphenoid sinus)
What bone is responsible for forming the roof of the nasal cavity?
Cribiform plate of the ethmoid bone
What parts of the ethmoid bone are found above the hard palate
Superior, Middle and Inferior nasal concha
What are the air spaces around the ethmoid bone called?
What bones must be broken for a transsphenoid/transnasal approach?
surgical fracture of the nasal septum and the floor (septum) & roof of the sphenoid sinus(es)
What fracture can be more useful for surgical approach in more complicated cases
Le Fort Fracture 1
What is the Dura Mater?
thick membrane adherent to the internal aspects of all the bones of the cranial vault
What is similar to the dura mater but covers the cerebellum?
** Has central gap to permit the brainstem to pass through**
What is the name given to the dura mater found over the pituitary fossa
What are the dural venous sinuses?
- Venous channels within the dura mater
- drain most of the venous blood from the cranial cavity (including the brain) into internal jugular veins