Anatomy of the Canine Brain Flashcards
What does the neural tube form from?
neuroectoderm
Which portion of the neural tube grows more?
the anterior portion
Which portion of the neural tube becomes the brain?
the anterior portion
What structures are dervied from the telencephalon?
cerebrum and rhinencephalon
What structure seperates both hemispheres of the brain?
the longitudinal fissure
What gyri are located on the lateral side of the brain?
sylvian, ectosylvian, and suprasylvian gyri
What sensory regions are located within the ectosylvian gyrus?
somesthetic and auditory
What sensory regions are located in the suprasylvian gyrus?
somesthetic and motor
What gyrus is located on the caudal portion of the brain?
the occipital gyrus
What sensory region is located in the occipital gyrus?
the visual region
What gyri are located on the dorsal side of the brain?
the precruciate and postcruciate gyri
What sensory regions are located in the postcruciate gyri?
somesthetic and motor
What are the lobes of the cerebrum?
temporal, frontal, parietal, occipital, and piriform
What structures make up gray matter?
cell bodies, dendrites, axons, glia, and capillaries
What structures make up white matter?
axons, glia, and capillaries
Is the cerebral cortex located in the grey or white matter?
grey
Is the basal nuclei located in the grey or white matter?
grey
Is the corpus callosum located in the grey or white matter?
white
What is the function of the corpus callosum?
it carries information from the right side of the cerebrum to the left side and vice versa
Is the internal capsule located in the grey or white matter?
white
What is the internal capsule made up of?
afferent and efferent fibers
Where does information flow within a neuron?
to dendrites and out at the axon terminal
What does the presynaptic part of a neuron do?
it sends information to another neuron
What does the postsynaptic part of a neuron do?
it recieves information from another neuron
What do afferent fibers do?
they bring sensory information to the brain or from one brain structure to antoher
What do efferent fibers do?
they send motor information to the brain or from one brain structure to another
How many processes at the cell body are there in unipolar neurons?
one
What type of neurons are unipolar neurons?
sensory
How many processes at the cell body are there in bipolar neurons?
two
What type of neurons are bipolar neurons?
sensory
How many processes at the cell body are there in multipolar neurons?
many
What type of neurons are multipolar neurons?
sensory and motor
What are the three layers of the meninges?
dura mater, arachnoid, and pia mater
What is located in between the arachnoid and pia mater?
the subarachnoid space
What is the leptomenengies?
the arachnoid and pia mater combined
What is the falx cerebri?
the layer of meninges located in between the two hemispheres
What is the tentorium cerebelli?
the layer of meninges located in between the cerebrum and the cerebellum
What is the dorsal sagittal sinus?
it is where the falx cerebri of noth the right and left meed
What circulates in the dorsal saggital sinus?
cerebrospinal fluid
What is the rhinencephalon for?
olfaction
Which cranial nerve is for olfaction?
CN I - olfactory nerve
What is the origin of the olfactory nerve?
olfactory cells of the olfactory epithelium
Where do the olfactory axons terminate?
in the olfactory bulb
What is the olfactory tract?
the communication between the olfactory bulb and the piriform lobe
What are the derivatives of the diencephalon?
thalamus, epithalamus, and hypothalamus
What is the epithalamus also known as?
the pineal gland
What is the pineal gland?
an endocrine structure that releases melatonin in response to darkness
Where is the pineal gland located?
caudodorsal to the thalamus
What is the hypothalamus made up of?
multiple nuclei
What is the hypophysis?
the pituitary
What is the thalamus made up of?
a group of bilateral nuclei
What does the thalamus do?
integrates sensory and motor information
What nuclei are located in the thalamus?
lateral and medial geniculate nuclei
What type of information is associated with the lateral geniculate nuclei?
visual information - it gets it form the retina
What type of information is associated with the medial geniculate nuclei?
auditory information - motor, somatic, and visceral
When sending information to the brain, what does everything stop at?
the thalamus
What are the only signals that bypass the thalamus to get to the cortex?
olfactory signals
What is the origin of the optic nerve?
axons of retinal ganglion cells
What does the optic nerve do?
carries visual information from the eye to the lateral geniculate nucleus
Information from the right eye goes to which side of the brain?
the left and right side
What tests can you do check the function of the optic nerve?
pupillary light reflex, visual reflex, and the menace response
What is a direct response to the pupillary light reflex?
pupil constriction of the eye that the light is directly shone in
What is the indirect response to the pupillary light reflex?
pupil constriction of the eye that the light is not shone in
How should an animal respond when using the visual reflex test?
they should turn their head towards the thing in their peripheral vision