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Flashcards in Brain Atlas Deck (32):
1

Dura Mater

Outermost covering

2

Arachnoid/Pia

Arachnoid layer is below dura mater and underlaid by the subarachnoid space where vessels and CSF travel

Arachnoid collapses onto pia mater postmortem

Pia mater is the innermost covering of the Brain tightly adhered to sulci and gyri

3

Arterial circle of Willis

Surrounds region of pituitary gland

Circle is fed by two internal carotid arteries and basilar artery

Caudal= caudal communicating arteries and rostral cerebral arteries form rostral end of circle

4

Rostral cerebral arteries

Between dorsal longitudinal fissure supplying the medial surface of the rostral cerebral cortex

5

Middle cerebral Artery

Supplies lateral surface of cerebral cortex

6

Caudal cerebral artery

Follows optic tract over thalamus to the longitudinal fissure

7

Dorsal Sagittal sinus

In the dura along dorsal midline

Transverse sinuses diverge from caudal end of the Sagittarius sinus in dura

8

Transverse sinus blood flow

In dura

Into the sigmoid and temporal

Sigmoid is continuous with the internal jugular vein and the temporal sinus is continuous with the internal maxillary vein

9

Dorsal longitudinal fissure

Separates into two hemispheres

10

Cruciate sulcus

Indentation near rostral part of frontal lobe and separates precruciate and postcruciate gyri

Precruciate: somatomotor for leg and arm and postcruciate: motor for face and somatosensory areas

In carnivores only

11

Rhinal fissure

Sulcus, runs longitudinally on ventrolateral aspect of brain and separates the olfactory bulb, tract and pyriform lobe (olfactory cortex)

12

Telencephalon

Optic to pons

Cerebrum, olfactory/pyriform lobe, hippocampus, corpus callosum
Lumen= lateral ventricles

Grows after other divisions so overlays diencephalon, mesencephalon

Only olfactory nerve

13

Diencephalon

Thalamus, hypothalamus and mammillary bodies

Lumen= third ventricle

Ends at interthalamic adhesion

Optic nerve

14

Mesencephalon

Crus cerebral, rostral and caudal colliculi

Lumen= mesencephalic aquaduct

Occulomotor and trochlear nerve associated

Midbrain, ends when the pons begins

15

Metencephalon

Cerebellum dorsal and pons centrally

Lumen= 4th ventricle

Includes some of the midbrain

Trigeminal is the only nerve associated with this division

16

Myelencephalon

Trapezoid bodies and pyramids, medulla

Until spinal cord

Lots of nerves associated

17

Brainstem

Mesencephalon and metencephalon but the pons only not cerebellum

18

Telencephalon boundaries

Olfactory bulbs to optic chiasm

19

Diencephalon boundaries

Optic chiasm to the intercrural fossa

20

Midbrain boundaries

Intercrural fossa to the rostral margin of pontine decussation

21

Pons boundaries

Rostral and caudal margin of the pontine decussation

22

Medulla boundaries

Rostral margin of trapezoid body and disappearance of pyramids, marks pyramidial decussation that occurs with the medulla-spinal cord junction

23

Abducens Nerve

CN 6

Emerge from junction of pons and trapezoid body

24

Facial and vestibulocochlear nerve

CN 7 and 8

Found together on lateral margin of trapezoid body

25

CN nerves

SSMMBMBSBBMM

26

Corpus Callosum

Largest commissure (axon) of telencephalon connecting the left and right hemispheres

Located ventral to this is the fornix

27

Rostral commissure

Within the fornix

Fornix= bundle related to hippocampus

28

Thalamus

Ventral to the fornix

Serves to relay all sensory information except smell to the cortex

Interthalamic adhesion is the middle of the thalamus connecting the two sides with the third ventricle surrounding it

29

Hypothalamus

Ventral to thalamus

Above the infundibulum of the pituitary

Endocrine, homeostatic and other survival functions

30

Mammillary bodies

Located caudoventral to hypothalamus

Affective emotional behaviors

31

Mesencephalic aquaduct

Narrow channel from third to fourth ventricle

32

Cerebellum

Dorsal structure that is caudal to the occipital cortex and above the brainstem