Peripheral Nerve

Endoneurium

Endoneurium

Layer of connective tissue that surrounds a single neuron

Perineurium

Layer of connective tissue that surrounds a bundle of nerves

Epineurium

Layer of connective tissue that surrounds an entire nerve

Fascicles

Bundle of nerves

Schwann cell nucleus

Central Canal

Dorsal/Posterior Column

Lateral Column

Ventral/Anterior Column

Dorsal/Posterior Horn

Lateral Horn

Ventral/Anterior Horn

Gray Commissure

White Commissure

Anterior Median Fissure

Posterior Median Sulcus

Dorsal Root

Contain Sensory Afferents

Ventral Root

Contain Motor Efferents

Dorsal Root Ganglion

Spinal Nerve

Gray Matter

White Matter

Dura Mater

Arachnoid Mater

Pia Mater

Where is the Cerebrospinal Fluid?

In the Subarachnoid Space

Where is the Subarachnoid Space?

Between the Arachnoid and Pia Maters

Cervical Enlargement

Thoracic Segment

Lumbar Enlargement

Cauda Equina

Conus Medullaris

Cervical Segment

Lumbar Segment

Sacral Segment

Filum Terminale

Foramen Magnum

Hole at the bottom of the skull

Lesser Occipital Nerve

2, 3. Lateral head, posterior ear

Ansa Cervicalis Nerve

Loop. Muscles of neck

Supraclavicular Nerve

3, 4. Neck and shoulders

Phrenic Nerve

Superior Trunk

Middle Trunk

Inferior Trunk

Anterior Divisions

Posterior Divisions

Lateral Cord

Posterior Cord

Medial Cord

Axillary Nerve

Deltoid and teres minor. Inner arm.

Radial Nerve

Arm extensor muscles, inferior lateral shoulder. Outside arm.

Musculocutaneous Nerve

Arm flexor muscles, lateral forearm. Elbow area.

Ulnar Nerve

Forearm and hand muscles, medial portion of palm and fingers. Helps with grip.

Median Nerve

Forearm flexors and hand muscles, lateral portion of palm and fingers. Thumb rotation.

Obturator Nerve

Thigh adductor muscles, medial thigh. Groin.

Femoral Nerve

Anterior thigh muscles, anterior thigh

Superior Gluteal Nerve

Gluteal muscles

Inferior Gluteal Nerve

Gluteal muscles

Sciatic Nerve

Tibial Nerve

Hamstring muscles, lateral and posterior lower leg

Peroneal/Common Fibular Nerve

Lateral and anterior lower leg muscles and skin

Pudendal Nerve

Urethral and anal sphincters, external genitalia and perineum