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What is brain size proportional to?

Body size only and can be divided into three major portions

1

What 3 major portions can the brain be divided into?

1. Cerebrum
2. Cerebellum
3. Brainstem

2

Cerebrum appearance

-83% of brain volume
-consists of 2 cerebral hemispheres
-divided into multiple lobes each marked by gyri and sulcus

3

Sulcus

shallow groves (slits)

4

Fissure

DEEP groves (deep slits)

5

Gyrus

Convolutions (ridges that stick out)

6

Longitudinal fissure

Separates the left and right hemispheres, although they remain connected through the corpus callosum

7

Central sulcus

Separate front and back of cerebrum

8

Cerebellum location

Lies inferior and posterior to the cerebrum; more delicate surface markings
(Below and to the back of cerebrum)

9

Brainstem parts

Base of brain
Thalamus
Hypothalamus
Midbrain (top of brains stem/middle of brain)
Pons (bump)
Medulla oblongata (slight bump)

10

Cerebrospinal fluid location

Make in ventricles (lined with epithelium- ependemial cells)
-fills 4 hollow spaces in brain

11

Gray matter

Consisting of non-myelinated soma and dendrites

12

White matter

Myelinate nerve fibers (myelin is on axon)

13

**Location of gray matter in brain and spinal cord

Gray matter forms outer cortex* in brain, but is an inner core* in the spinal cord

14

White matter location in brain and spinal cord

White matter is inside brain and outside spinal cord

15

Meningitis

Very courageous and very deadly inflammation/infection in brain. Perform spinal tap to detect

16

Meninges

(Singular=meninx)
3 protective fibrous coverings that separate the brain and spinal cord from the skull and vertebrae

17

What separates brain and spinal cord from the skull and vertebrae

Meninges

18

Dura mater

Outermost meninx, really rough, consists of a periosteal layer and an inner meningeal layer

19

What part of and what does the dura mater form within the vertebral canal?

The meningeal layer (inner layer of dura mater) forms a dural sheath

20

Dural sheath

Same thing as the meningeal layer (inner layer) of the dura mater just the name for when it's in the vertebral canal!

21

Epidural space location

Between the dural sheath and surrounding bone

(Space is between the skull and the dura mater)

22

Arachnoid mater

The second meninx that adheres to the dura and sends spider like extensions out to the #3 pia mater (highly vascular)

23

#3 pia mater

Highly vascular, closely follows the contour of the brain

24

Subdural space

Between (below) dura mater and (above) arachnoid mater

25

Subarachnoid space

Separates arachnoid and pia mater

26

Cerebrospinal fluid appearance and function

Clear, colorless liquid that functions to lend buoyancy, for protection, in waste removal, and in providing a stable chemical environment

27

What is CSF produced by

The choroid plexus (area with ependymal cells) within each of the 4 ventricles

28

What do the ventricles in brain consist of?

Capillaries covered by simple cuboidal epithelium (ependymal cells that make CSF)

29

Blood-CSF fluid barrier

Tight junctions within capillaries in the choroid plexus form this that protects the brain; regulates substance entering the brain