Sheep Brain Flashcards Preview

Neurology > Sheep Brain > Flashcards

Flashcards in Sheep Brain Deck (18):
1

Brainstem

Pons and medulla

2

Pons

Axons of the middle cerebellar peduncle from the pontine nuclei forming a bulge on brainstem caudal to CN IV and those that cross midline form the pontine decussation

3

Medulla

From pons to the C1 nerve
Trapezoid bodies and pyramids

Pyramids are the continuation of the crus cerebri of the mesencephalon as its axons travel caudally to influence cranial nerve motor nuclei in the brainstem and motor neurons in spinal cord

4

Fourth ventricle

Dorsal surface of medulla and pons

Contains choroid plexus and CSF

5

Cerebellar peduncles

Bundles of axons that relay info related to somatic sensation and movement into and out of the cerebellum

6

Obex

Where fourth ventricle narrows to central canal of spinal cord

Gracile tubercle, cuneate and trigeminal tubercle

Beneath tubercles are tracts and nuclei containing nerves and axons which convey fine touch sensation for lower (gracile) and upper body (cuneate) and face

7

Tegmentum

Middle portion of the midbrain between roof and floor

8

Crus cerebri

Cerebral peduncle is the major highway of nerve fibers running throughout the brain in longitudinal direction

Continuation of white matter and turns into the pyramids caudally

9

Choroid plexus

In ventricles CSF production

10

Cerebral hemisphere

Hippocampus is medial and neocortex is expansive lateral wall

Accompanied by lateral ventricle

11

Amygdala

Subcortical part of telencephalon and plays important role in emotion

12

Optic tract

Terminates at lateral geniculate body

Processes visual info and communicates with the visual cortex in the occipital lobe

13

Medial geniculate body

Smaller bump caudal to lateral geniculate which receives auditory input from caudal colliculus and communicates with auditory cortex in the temporal lobe

14

Internal capsule

In rostral half, large fiber bundle that separates the caudate nucleus and putamen which are parts of the basal ganglia

15

Globus pallidus

Small, basal ganglion, ventrally located

16

Superhighway

Large number of axons traveling through the internal capsule, crus, cerebri and pyramids

Descending axons from cerebral cortex to the brain stem and spinal cord and ascending axons from the thalamus to cortex

Axons headed to brainstem innervate cranial nerve nuclei bilaterally and axons to spinal cord cross in pyramidial decussation at boundary between medulla and spinal cord

17

White matter

Tracts that are analogous to large highways

18

Gray matter

Tracts that are analogous to local neighborhoods