The meninges are three layers that cover and protect the brain. From outer to inner they are the dura, arachnoid, and pia. The cerebral spinal fluid flows between the arachnoid and pia layers, nourishing and protecting the brain and spinal cord. The pia is the innermost layer and extends into the brain's sulci.

1. The meninges cover and protect the brain
From outer to inner they include:
1. Dura
-tough outer layer we took off
2. Arachnoid
-The Cerebral Spinal Fluid (CSF)
Frontal Lobe
flows between the Arachnoid
and Pia layers and serves to nourish
and protect the brain & spinal cord.
3. Pia
-pearly layer extends into
Parietal Lobe Parietal Lobe
the sulci
This opaque covering is the dura
LOBES of the BRAIN
Occipital Lobe
Cerebellum

2. Cerebellum
Brain Stem:
Midbrain (we won’t differentiate this)
Pons
Medulla

3. Gyrus Sulci
Longitudinal
Fissure

4. The Pia Mater is the innermost meningeal layer.
It extends into the sulci.
The shiny coating is the Pia Mater
Transverse Fissure
Separates cerebellum
and cerebrum
Cerebellum

5. Lateral View: Left Hemisphere of the
Cerebrum and cerebellum with brain
stem
Left Parietal Lobe
Frontal
Lobe Transverse Fissure
Temporal
Cerebellum
Lobe
Pons

6. Underside of Brain
Brain Stem This usually
gets pulled off
(Pons & Medulla) Pituitarywith the dura.
Gland
Olfactory
Optic Chiasm
Optic Nerves
Bulbs
Capillary Bed

7. Posterior (rear) view
showing cerebellum
being pulled down to Occipital Lobe of Cerebrum
expose the Superior
colliculi, inferior colliculi,
and the Pineal Gland.
Pineal
Gland
Superior Colliculi Inferior Colliculi
Cerebellum

8. Mammillary Body
Optic Chiasm
Olfactory Bulb
Pons Medulla
Infundibulum
Stalk of the pituitary
Hypothalamus
Deep to the infundibulum
Occulomotor Nerve

9. Corpus callosum
Fornix Arbor Vitae
Of Cerebellum
Thalamus
Pons Medulla
Spinal Cord
Optic Chiasm

10. Lateral view, hemi section of lab brain model.
superior
posterior anterior
Cerebellum
Pituitary Gland
inferior

11. Olfactory Tract Pituitary Gland
pons

12. SPINAL CORD ANATOMY
Keep in mind that our models are HUGE. The spinal cord
Is really only about the thickness of your pinky finger!
Posterior
Spinous Process of Vertebrae
Posterior White Column
Central Canal: contains CSF
Posterior Gray Horn
Lateral Gray Horn
Contains Sensory & Interneurons
Axons of Sensory Neurons
Dorsal Root Ganglion
Anterior Gray Horn: Contains cell bodies of
somatic motor neurons
Axons of Motor Neurons
Anterior

13. This is the URL to a sheep dissection lab created by five students in
the bi-college (Haverford and Bryn Mawr) community: Jessica Kuhn,
Jessica Magid, Karen Revere, Elizabeth Caris, and Gray Vargas
through science education at Bryn Mawr College. It is a fantastic site
to explore the brain. Not everything you will learn will be on a test
BUT remember that educating yourself in your field is NOT about
what is going to be on the test .