NPTE MSK Innervation

What Muscles are innervated by Musculocutaneous Nerve? Nerve roots?

• C5-C7

• biceps brachii

• brachialis

• coracobrachialis

What Muscles are innervated by Axillary nerve? Nerve roots?

• C5-C6

• Deltoid & teres minor

What Muscles are innervated by Radial nerve?

• C5-T1

• Brachioradialis

• Extensors of wrist, hand, forearm

• Anconeus, Abductor pollicis longus

• Supinator

• Triceps brachii

What Muscles are innervated by Median nerve? Nerve roots?

• C5-T1

• “1-2 LOAF”

• Lumbricals 1 & 2

• Opponens Pollicis

• Abductor Pollicis brevis

• flexor pollicis brevis

What Muscles are innervated by Ulnar nerve? Nerve roots?

• C8-T1

• “4-5 Mafia”

• Medial 2 lumbricals (4-5)

• adductor pollicis

• flexor carpi ulnaris , Flexor digitorum profundus, flexor digiti minimi brevis

• Interossei (Palmar & Dorsal)

• abductor digiti minimi

What Muscles are innervated by Medial Plantar nerve? Nerve roots?

• Tibial Nerve L4-S3

• Flexor digitorum brevis

• Lumbricals (2nd toe)

• abductor hallucis 

• flexor hallucis brevis 

What Muscles are innervated by lateral plantar nerve? Nerve roots?

• Tibial nerve (L4-S3)

• Abductor digiti minimi

• Quadratus plantae

• Lumbricals (toe 3-5)

• Adductor hallucis 

• Flexor digiti minimi brevis

• Dorsal interossei

• Plantar interossei

What Muscles are innervated by sciatic nerve? Nerve roots?

• L4-S3

• Hamstring

  • Semitendinosis 

    • Flex & IR leg

    • Extends thigh 

  • Semimembranosis

    • Flex & IR leg

    • Extends thigh 

  • Biceps Femoris 

    • Flex & ER leg

    • Extends thigh 

• Adductor magnus (tibial portion)

What Muscles are innervated by nerve to piriformis? Nerve roots?

• S1-S2

• Piriformis

  • ER thigh

  • Abducts flexed thigh

What Muscles are innervated by Superior gluteal nerve? Nerve roots?

• L4-S1

• Glute Med/Min

  • Abducts & IR thigh 

• TFL

  • Abducts, IR, flex thigh

What Muscles are innervated by inferior gluteal nerves? Nerve roots?

• L5-S2

• Glute max 

  • Extends thigh

  • ER hip

What Muscles are innervated by Obturator nerve? Nerve root?

• L2-L4

• Gracilis 

  • Adducts thigh

• Adductor magnus

  • Adducts & flexes thigh

  • Extends thigh (hamstring portion)

• Adductor brevis

  • Adducts thigh

  • Weak hip flexor 

• Adductor longus

  • Adducts thigh 

• Obturator externus 

What Muscles are innervated by Femoral nerve? Nerve root?

• L2-L4

• Pectineus

  • Adducts & flex thigh

• Sartorius 

  • Abducts, ER, flex thigh

  • Flexes & IR thigh

• Vastus intermedius

  • Extends leg

• Vastus lateralis 

  • Extends leg

• Rectus femoris 

  • Extends leg & flex thigh

• Iliacus (iliopsoas)

  • Flexes thigh

What Muscles are innervated by Tibial Nerve? Nerve root?

• L4-S3

• Gastrocnemius 

  • PF foot

• Soleus 

  • PF foot

• Plantaris 

  • Weakly assists knee flexion

• Popliteus 

  • Flexes knee

• Flexor digitorum longus 

  • Flexes 2-5 digits

  • PF foot

  • Supports longitudinal arch

• Flexor hallucis longus 

  • Flexes great toe

  • PF foot

• Tibialis posterior 

  • PF foot

  • Inverts foot

What Muscles are innervated by Deep Peroneal Nerve? Nerve root?

• L4-L5

• Peroneus tertius 

  • DF & everts foot

• Extensor hallucis longus 

  • DF foot & extend great toe

• Extensor digitorum longus 

  • DF foot & extends digits 2-5

• Tibialis anterior 

  • DF & Inverts foot

What Muscles are innervated by Superficial peroneal nerve? Nerve root?

• L5-S2

• Peroneus longus

• Peroneus brevis 

• Actions (Both): 

  • Everts foot

  • PF foot