Chapter 21 - Spinal Cord and Spinal Nerves

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1

Spinal Cord

The bundle of nervous tissue that runs from the brain to the first to third lumbar vertebrae and provides a conduction pathway to and from the brain.

2

Conus Medullaris

The terminal end of the spinal cord.
Occurs near lumbar vertebral levels 1 (L1) and 2 (L2).

3

Filum Terminale

Continuation of the conus medullaris and is the thin cord-like structure that extends down to the end of the spinal canal.

4

Cauda Equina

The roots of the spinal nerves controlling movement and sensation in the legs. These nerve roots are located in the lower spine.

5

Gray Matter

Cross section of the spinal cord; looks like a butterfly or "H"

6

Posterior Horns

Dorsal projections of the gray matter.

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Anterior Horns

Ventral projections of the grey matter.

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Lateral Horns

Lateral outpocketing of grey matter that can be observed in the thoracic and lumbar regions of the spinal cord.

9

Gray Commissure

Central area of grey matter connecting the two ventral regions.

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Central Canal

Surrounded by the gray commissure, contains CSF.

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Dorsal Root

Point of entry of interneurons and sensory fibers into the spinal cord from the body.

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Dorsal Root Ganglion

Peripheral collection of cell bodies of first-order afferent neurons whose central axons enter the spinal cord.

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Ventral Root

Point of exit for axons of motor neurons of the somatic nervous system, so their signal can be transmitted into adjacent spinal nerves.

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White Matter

Surrounds the gray matter and is bisected by fissures.

15

Anterior Median Fissure

More open fissure

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Posterior Median Sulcus

More shallow.

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Posterior Median Septum

A sheet of glial tissue in the midsagittal plane of the spinal cord that extends from the posterior median sulcus toward the gray commissure and that partitions the posterior part of the spinal cord into right and left halves

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White Column (Dorsal Funiculus)

Dorsal section of white matter

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White Column (Lateral Funiculus)

Lateral section of white matter

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White Column (Ventral Funiculus)

Ventral section of white matter

21

Tracts

Collection of axons that conduct sensory inpulses to the brain.

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Spinal Nerves Mixed

All spinal nerves are mixed nerves (carry signals to and from the spinal cord)

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Dorsal Rami

The posterior branches of the spinal nerves. (Smaller than ventral rami.)

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Ventral Rami

The anterior branches of the spinal nerves. (Larger than dorsal rami)

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Nerve Plexuses

Interlacing nerve networks that occur in the cervical, brachial, lumbar, and sacral regions and primarily serve the limbs.

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Cervical Plexus

Phrenic Nerve

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Brachial Plexus

Axillary Nerve
Radial Nerve
Medial Nerve
Ulnar Nerve

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Lumbar Plexus

Femoral Nerve

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Sacral Plexus

Sciatic Nerve (Largest)
Common Fibular Nerve
Tibial Nerve

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What is A?

White Matter/Column

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What is B?

Dorsal Funiculus

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What is C?

Ventral Funiculus

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What is D?

Lateral Funiculus

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What is E?

Dorsal Median Sulcus

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What is F?

Gray Commissure

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What is G?

Dorsal Horn

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What is H?

Ventral Horn

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What is I?

Lateral Horn

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What is J?

Gray Matter

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What is K?

Central Canal

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What is L?

Ventral Medium Fissure

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What is M?

Dorsal Ganglia Root

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What is N?

Spinal Nerve

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What is O?

Dorsal Root

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What is P?

Ventral Root