Neuro- Structure cont...
Card Set Information
Neuro- Structure cont...
GSA and GVA arise from the _______.
GSE and GVE arise from the ________.
What 3 structures are located on the ventral surface of the myelencephalon?
pyramids, olive, trapezoid body
What are the left an right pyramids separated by?
ventral median fissure
75% of fibers from the pyramids descend as __________ after __________; 25% continue _________ into the spinal cord as __________, which cross at _________.
lateral corticospinal tract; decussation; ipsilaterally; ventral corticospinal tract; site of synapse
The olive is the site of...
synapse of the extra-pyramidal motor system.
The pyramid regulates and controls ________.
Where is the olive located?
half way down the length of the pyramids, within the myenecephalon
Where is the trapezoid body located?
at the rostral limit of the myelenecephalon
What is the function of the trapezoid body?
What is the dorsal surface of the myelencephalon characterized by?
tracts and the fourth ventricle
Where is the fasciculus gracilis located?
on the dorsal surface of the myelencephalon, on either side of the ventral median sulcus
What controls conscious proprioception from the pelvic limb?
What 4 structures are located on the dorsal surface of the myelencephalon?
fasciculus gracilis, fasciculus cuneatus, spinal tract if the trigeminal nerve, obex
What controls conscious proprioception from the thoracic limb?
Where is the fasciculus cuneatus located?
lateral to the fasciculus gracilis on the dorsal surface of the myelencephalon
What does the spinal tract of the trigeminal nerve control?
pain and temperature sensation from the head and face
Where is the spinal tract of the trigeminal nerve located?
lateral to the fasciculus cuneatus on the dorsal surface of the myelencephalon
What is the obex?
landmark at the caudal angle of the fourth ventricle in the myelencephalon
What is the medullary velum?
thin layer of ependyma and pia mater that forms the roof over the cavity of the fourth ventricle
Where is the caudal medullary velum located?
dorsal surface of the myelencephalon
Where is the rostral medullary velum?
dorsal surface of the metencephalon
Where is the sulcus limitans located?
groove in the lateral wall of the fourth ventricle, where the wall meets the floor
What and where is the dorsal median sulcus?
continuation from the spinal cord in the midline of the floor of the fourth ventricle
What cranial nerve(s) is/are located in the myelencephalon?
What 3 structures make up the closed portion of the myelencephalon?
fasciculus gracilis, fasciculus cuneatus, spinal tract of the trigeminal nerve
What 2 structures are located on the ventral surface of the metencephalon?
transverse fibers of the pons,longitudinal fibers of the pons
What are the transverse fibers of the pons?
pyramidal motors fibers going into the cerebellum
The transverse fibers of the pons become the _________.
middle cerebellar peduncle
What are the longitudinal fibers of the pons?
pyramidal motor fibers going through the brainstem into the spinal cord
What 2 structures are located on the dorsal surface of the metencephalon?
cerebellum, cerebellar peduncles
What are the functions of the cerebellum?
coordinates, integrates, and regulates motor activity with sensory information
What are the functions of the cerebellar peduncles?
sensory and motor; connects cerebellum to brainstem
What cranial nerve(s) is/are located in the metencephalon?
What 2 structures are on the ventral surface of the mesencephalon?
crus cerebri, interpeduncular fossa
What is the crus cerebri?
descending pyramidal motor pathway
Where are the left and right crus cerebri located?
on the floor of the mesencephalon
Where is the interpeduncular fossa located?
space b/w the left and right crus cerebri
What structure is located on the dorsal surface of the mesencephalon?
What are the components of the corpora quadrigemina?
left and right rostral and caudal colliculi
What is the purpose of the right and left rostral colliculus?
What is the purpose of the left and right caudal colliculus?
What part of the ventricular system is located within the mesencephalon?
What cranial nerve(s) is/are located in the mesencephalon?
What is the only cranial nerve that comes off the dorsal surface of the dorsal surface?
What 4 structures are located on the ventral surface of the diencephalon?
mamillary bodies, tuber cinereum, optic chiasm, optic tract
Where are the mamillary bodies located?
on the floor of the hypothalamus on the ventral surface of the diencephalon
What are the purposes of the mamillary bodies?
site of synpase for emotions and ANS
Where is the tuber cinereum located?
b/w the mamillary bodies and optic chiasm on the ventral surface of the diencephalon
What is the purpose of the tuber cinereum?
site of attachment for the pituitary gland
What is the function of the optic chiasm?
site of decussation for CN II (vision)
What is the optic tract?
What 5 structures are on the dorsal surface of the diencephalon?
medial and lateral geniculate bodies, third ventricle, interthalamic adhesion, pineal body
The third ventricle is within the _______; it wraps around the ________.
diencephalon; interthalamic adhesion
What is the interthalamic adhesion?
cut surface of the thalamus as seen on the midline
What structures make up the metathalamus?
medial and lateral geniculate bodies
What forms the epithalamus?
What is the function of the pineal body?
releases melatonin to regulate sleep patterns and circadian rhythm
What cranial nerve(s) is/are located within the diencephalon?
What 2 structures are on the ventral surface of the telencephalon?
olfactory bulb, piriform lobe
What is the function of the olfactory bulb?
site of synapse for the olfactory n. (CN I)
What is the function of the piriform lobe?
olfactory cortex, where smelling is perceived
What 3 structures are on the dorsal surface of the telencephalon?
gyrus/gyri, sulcus/sulci, cerebral hemispheres
What separates the cerebral hemispheres?
longitudinal cerebral fissure
What does the transverse cerebral fissure separate?
cerebrum and cerebellum
What components of the ventricular system are within the telencephalon?
lateral ventricles and interventricular foramen
What cranial nerve(s) is/are present within the telecephalon/
What are the white matter fiber systems of the telencephalon?
projection fibers, association fibers, commissural fibers
What are projection fibers?
ascending and descending axons (white matter) from cell bodies
What are the types of association fibers?
long interlobar fibers, short intralobar fibers
What are long association fibers?
interlobar- pass b/w lobes
What are short association fibers?
intralobar- pass b/w adjacent gyri
What is an example of a long association fiber?
What are commissural fibers?
fibers that cross the midline, passing b/w hemispheres
What is an example of commissural fibers?