Spinal cord

Arachnoid mater

4 Delicate layer that is attached to the inside of the dura and around the brain and spinal cord

Dura mater

5 Forms the dural sheath, which in turn encloses the spinal cord ~ most superficial mater ~ dense fibrous tissue

Musculocutaneous nerve

6

Axillary nerve

7

Radial nerve

8

Median nerve

9

Posterior (dorsal) column

A

Subarachnoid space

A

Ulnar nerve

10

Pia mater

3 ~ most deep ~ thin fibrous tissue that is impermeable to fluid ~ encloses cerebrospinal fluid ~ allows blood vessels to pass through and nourish the brain

Anterior (ventral) column

B

Pia mater

B

Arachnoid mater

C

Lateral column

C

Dura mater

D

Posterior (dorsal) root ganglion

E

Spinal nerve

F

Anterior (ventral) root

H

Posterior (dorsal) median sulcus

I

Gray commissure

J

Posterior (dorsal) horn

K

Anterior (ventral) horn

L

Lateral horn

M

Central canal

O

Anterior (ventral) median fissure

P

Phrenic nerve

USE DRAWING FROM LAB

Posterior cord

USE DRAWING FROM LAB Y

Lateral cord

X

Medial cord

Z