Anatomy Review

Cervical roots C1-3

Cervical Plexus

CNXII, C1 to C5

Motor

Supplies mainly neck

muscles and sensory of

the head and neck

region Note C3 to C5 -

Phrenic nerve

Lesions

Neck and upper back

muscle weakness and

atrophy, Hiccups,

breathing difficulty

Cervical Roots Simplified C5, C6, C7

Lumbar Roots Simplified L4, L5, S1

Anatomy Review

Vascular system in the head and neck

Arterial Blood Supply

Anterior spinal artery

Branch of vertebral

Descends

Segmental supply

Vertebral

Thyrocervical

Costovertebral

Aorta (thoracic, lumbar)

Internal Iliac

Posterior spinal artery

Vertebral

Occasionally PICA

Descends laterally along dorsal roots

Segmental arteries

Enter via IVF

3 branches

Anterior

Posterior

Neurospinal

• Anterior, Posterior

Venous Drainage

Three main plexus

Internal plexus

In the canal itself

Vertebral Plexus

In the epidural space

Irregular venous plexus

On the cord itself

All are valveless

3 posterior vessels

3 anterior vessels