Spinal Cord, nerve plexuses, and spinal nerves

Be able to identify on a model, General location

Cervical Enlargement

L- Cervical region of spinal cord

D- C3-T2 spinal cord segments

C5-T1 spinal cord segments contain neurons for upper limb innervations

Lumbar enlargment

L- Lower thoracic vertebral canal (T9-12 vertebral levels)

D- L1-S3 spinal cord segments

Contains neurons for lower limb innervations

Autonomic (sympathetic) ganglia

D- Location of postganglionic sympathetic neuronal cell bodies

22 pairs of ganglia

AKA- paravertebral region

Cervical plexus

Contributions- Ventral rami of C1-C4 spinal nerves

Composition- Motor, general sensation

Brachial Plexus

Contributions- Ventral rami of C5-T1 spinal nerves

Composition- Motor. General Sensation

Axillary Nerves

Contributions- Ventral Rami of C5-6 spinal nerves

Composition- Motor and General sensation

Musculocutaneous Nerve

Contributions- Ventral rami of C5-6 spinal nerves

Composition- Motor and Genreal sensation

Ulnar nerve

Contributions- Ventral rami of C8-T1 spinal nerves

Terminal bracnh of medial cord

Composition- Motor and general sensation

Median nerve

Contributions- Ventral rami of C5-T1 spinal nerves

Composition- Motor and general sensation

Radial nerve

Contributions- Ventral rami of C5-T1 spinal nerves

Composition- Motor and General Sensation

Lumbar Plexus

Contributions- Ventral rami of L1-5 spinal nerves

Femoral nerve

Contributions- Ventral Rami of L2-4

Composition- Motor and general sensation

Sacral Plexus

Contributions- Ventral rami of S2-4 spinal nerves

Siatic nerve

Contributions- Ventral rami of L4-S3 spinal nerves

Composition- Motor and general sensation

Tibial Nerve

Contributions- Ventral rami of L4-S3 spinal nerves

Composition- Motor and General sensation

Common Fibular nerve

Contributions- Ventral rami of L4-S2 spinal nerves

Composition- Motor and General sensation