Spinal Tracts and plexuses

gracile Fasciculus

ascending, posterior, medullar.

sensation of limbs and trunk below level T6

Cuneate Fasciculus

ascending, posterior, medullar

fsensation of limb and trunk above level T6

Lateral corticospinal

descending tract, lateral, medullar- 19 million

all skeletal muscle and fine limb movement below neck from cerebrum,

Anterior corticospinal

descending anterior, spinal cord- 1 million

all skeletal muscle and fine limb movement below neck

from cerebrum,

cervical plexus

C1-C5

Cervical plexus branches

lesser occipital, greater auricular, transverse cervical, supraclavicular, ansa cervicalis, phrenic

Cervical plexus innervation

motor: hyoid muscles, diaphragm

sensory: skin of ears, head, neck, shoulder, anterior chest

Brachial plexus

C5-T1

Brachial plexus branches

Musculocutaneous, axillary, ulnar, radial, median

Brachial plexus innervation

motor: muscles of arm, forearm, hand, shoulder, scapula and chest

sensory: skin of arm, forearm, hand, shoulder, and scapula

Thoracic plexus

NO Plexus, intercostal muscles

Lumbar plexus

L1-L5

Lumbar plexus branches

femoral, obturator, lateral femoral cutaneous, iliohypogastric, ilioinguinal, genitofemoral

lumbar plexus innervation

motor: muscles of medial, anterior thigh, genitals and abdominal muscles

sensory: skin of genitalia, buttocks, hip, anterior and medial thigh, leg knee

Sacral coccygeal plexus

L4-Co1

Sacral coccygeal plexus branches

superior, inferior gluteal, siatic n (common fibular, tibial) femoral cutaneous, pudendal,

sacral coccygeal plexus innervation

motor: muscles of hamstrings, buttocks, leg

Sensory: skin of genitals, buttocks, posterior thigh and leg, foot and hip joint

lesser occipital

cervical plexus

greater auricular

cervical plexus

transverse cervical

cervical plexus

supraclavicular

cervical plexus

ansa cervicalis

cervical plexus

phrenic

cervical plexus

musculocutaneous

brachial plexus

axillary

brachial plexus

ulnar

brachial plexus

radial

brachial plexus

median

brachial plexus

femoral

lumbar plexus

obturator

lumbar plexus

lateral femoral cutaneous

lumbar plexus

iliohypogastric

lumbar plexus

ilioinguinal

lumbar plexus

genitofemoral

lumbar plexus

superior gluteal

sacral coccygeal plexus

common fibular

(sciatic) sacral coccygeal plexus

tibial

(sciatic) sacral coccygeal plexus

femoral cutaneous

sacral coccygeal plexus

pudendal

sacral coccygeal plexus

sciatic

sacral coccygeal plexus