NERVOUS SYSTEM - Major Nerve Plexuses

Question 1

Cervical Plexus (C1-C4)

Answer 1

Includes the Phrenic nerve (C3-C4) → Diaphragm control

Question 2

Brachial Plexus (C5-T1)

Answer 2

Radial nerve → Extensors & posterior skin of the upper limb.

Median nerve → Wrist & finger flexors.

Ulnar nerve → Works with the median nerve.

Question 3

Lumbar Plexus (L1-L4)

Answer 3

Femoral nerve → Quadriceps; thigh flexors & knee extensors.

Question 4

Sacral Plexus (S1-S4)

Answer 4

Sciatic nerve → Controls the lower limbs except for the anteromedial thigh.