Spinal Nerves Plexuses Flashcards
Phrenic nerve innervates?
Diaphragm (motor & sensory)
Cervical plexus is formed by what?
Ventral Rami: C1-4
Phrenic nerve
Accessory nerve
Accessory nerve innervates?
Sternocleidomastoid & trapezius muscles.
Brachial plexus is formed by:
Ventral rami: C5-8 & T1
Axillary nerve
Musculocutaneous nerve
Median nerve
Ulnar nerve
Radial nerve
Axillary nerve innervates?
Deltoid muscle (shoulder abduction)
Musculocutaneous nerve innervates?
Elbow flexors (biceps brachii & brachialis)
Median nerve innervates?
Most anterior forearm muscles (wrist flexion & abduction)
(Flexor carpi radialis)
= carpal tunnel syndrome
Ulnar nerve innervates?
A few anterior forearm muscles (wrist flexors & adduction)
(Flexor carpi ulnaris & flexor digitorum profundus)
= funny bone
Radial nerve innervates?
All extensors of the upper limb.
What is the largest branch of the brachial plexus?
Radial nerve
What are the 4 major branches of the brachial plexus?
- Roots
- Trunks
- Divisions
- Cords
Lumbar plexus is formed by what?
Ventral rami: L1-4
Femoral nerve
Obdurator nerve
Femoral nerve innervates?
Anterior thigh musculature (iliacus, sartorious, quadriceps).
Obturator nerve innervates?
Adductor muscles of the thigh (adductor longus & gracilis).
What is the largest nerve of the lumbar plexus?
Femoral nerve
The femoral nerve branches to form what?
Saphenous nerve
Supplying skin over medial surface of thigh
What forms the sacral plexus?
Ventral rami: L4-S-4
Sciatic nerve
What does the sciatic nerve form?
Tibial nerve
Common peroneal nerve
What does the tibial nerve innervate?
Muscles of the back of the leg (hamstrings, gastroc, and soleus)
The tibial nerve branches into what?
The plantar nerve
For the foot
The common peroneal nerve branches into what?
Deep peroneal nerve
Superficial peroneal nerve
The deep peroneal nerve innervates what?
Tibial is anterior
The superficial peroneal nerve innervates what?
Peroneous longus
What is the thickest and longest nerve in the body?
Sciatic nerve
