Spinal Nerves and Spinal Cord

1

Posterior median sulcus

2

Posterior/dorsal horn

3

Lateral horn

4

Anterior/ventral horn

5

Anterior/ventral fissure

6

Anterior/ventral root

7

Posterior/dorsal root

8

Grey commissure

1

Posterior median sulcus

2

Posterior funiculus

3

Posterior horn

4

Lateral funiculus

5

Lateral horn

6

Anterior horn

7

Anterior funiculus

8

anterior fissure

9

Anterior root

10

Posterior root

11

Grey commissure

1

Conus medullaris

2

Filum terminale

3

Spinal nerve

4

Cauda equina

1

Central cana

2

Ependymal cells

3

Lateral funiculus

4

Anterior horn

5

Central canal

6

Posterior horn

1

Phrenic nerve

2

Axillary nerve

3

Musculocutaneous nerve

4

Radial nerve

5

Ulnar nerve

6

median nerve

What is the Cervical Plexus?

Located in the neck (C1-C5), it controls the diaphragm (via the phrenic nerve)

• supplies the neck and shoulders.

What is the Brachial Plexus?

Located near the shoulder (C5-T1),

supplies the upper limbs and shoulders.

What is the Lumbar Plexus?

Found in the lower back (L1-L4),

supplies the anterior thigh, abdominal wall, and hips.

What is the Sacral Plexus?

Located near the pelvis (L4-S4), it supplies the posterior thigh, lower leg, and foot (e.g., the sciatic nerve).

What is the largest nerve in the body?

sciatic nerve from the Sacral Plexus.

1

femoral nerve

2

sciatic nerve

3

tibial nerve

4

Obturator nerve

5

Fibular nerve