Plexuses

Plexuses

Networks of ventral rami (mixed nerves)

Overall layout of the plexuses + extra

Cervical plexus, brachial plexus, intercostal nerves(not plexus) , lumbar plexus, sacral plexus, cauda equina

Cervical plexus - origin and innervation

C1-C5 → phrenic nerves

innervates skin and muscle of neck, ear, back of head, and shoulder

Phrenic nerves → where what and what happens when its irritated

In cervical plexus (C3-C5) → major motor and sensory nerve for diaphragm

hiccups if irritated phrenic nerves

Brachial plexus - origin and innervation

C5-T1 → innervate upper limbs

axillary, musculocutaneous, median, ulnar and radial nerves are all part of the ___

brachial plexus

Erb’s Palsy

stretching/ injury of upper trunk of brachial plexus (upper arm)

Klumpke’s Paralysis

injury to lower roots of brachial plexus → claw hand

Thoracic region

T2→T12 → intercostal nerves no plexus → between ribs

Lumbar plexus - origin and innervation

L1-L4

innervates thigh, abdominal walls, and psoas muscles

Femoral nerves → what plexus and what innervation

lumbar plexus → quadricep + anterior medial thigh

Obturator nerve → what plexus and what innervation

lumbar plexus → adductor groin muscles

Sacral plexus - origin and innervation

L4 → S4

innervate buttocks, lowerlimb, pelvis, foot

Sciatic nerve - what plexus and what innervations

sacral plexus → longest and thickest nerve

innervate hamstring adductor and most leg and foot muscles

What two nerves is the sciatic nerve composed of

tibial and common fibular

Cauda equina

bundle of lower spinal roots

Sciatica

sciatic nerve pain radiating down leg