TBL-14: Lumbar and Sacral Plexus

jelani version

Iliopsoas (innervation)

Femoral (posterior L2-L4)

Iliopsoas (action)

Hip flexion

Pectineus (innervation)

Femoral (posterior L2-L4)

Pectineus (action)

Hip flexion

Sartorius (innervation)

Femoral (posterior L2-L4)

Sartorius (action)

Hip: FABER

Leg: IR (when knee flexed)

Rectus abdominus (innervation)

Femoral (posterior L2-L4)

Rectus femoris (action)

Hip flexion

Knee extension

Vastus lateralis (innervation)

Femoral (posterior L2-L4)

Vastus lateralis (action)

Hip flexion

Knee extension

Vastus intermedius (innervation)

Femoral (posterior L2-L4)

Vastus intermedius (action)

Hip flexion

Knee extension

Vastus medialis (innervation)

Femoral (posterior L2-L4)

Vastus medialis (action)

Hip flexion

Knee extension

Obturator externus (innervation)

Obturator (anterior L2-L4)

Obturator externus (action)

Lateral rotation of thigh

Adductor longus (innervation)

Obturator (anterior L2-L4)

Adductor longus (action)

Thigh adduction

Adductor brevis (innervation)

Obturator (anterior L2-L4)

Adductor brevis (action)

Thigh adduction

Pubofemoral part of adductor magnus (innervation)

Obturator (anterior L2-L4)

Pubofemoral part of adductor magnus (action)

Thigh adduction

Gracilis (innervation)

Obturator (anterior L2-L4)

Gracilis (action)

Thigh adduction

Cremaster (innervation)

Genital branch of genitofemoral (L1-L2)

Cremaster (action)

Raises scrotum

Gluteus medius (innervation)

Superior gluteal (L4-S1)

Gluteus medius (action)

Abduction and medial rotation of extended thigh

Gluteus minimus (innervation)

Superior gluteal (L4-S1)

Tensor fascia lata (innervation)

Superior gluteal (L4-S1)

Gluteus minimus (action)

Abduction and medial rotation of extended thigh

Tensor fascia lata (action)

Abduction and medial rotation of extended thigh

Gluteus maximus (innervation)

Inferior gluteal (L4-S2)

Gluteus maximus (action)

Extension and lateral rotation of thigh

Piriformis (innervation)

Nerve to piriformis (S1-S2)

Piriformis (action)

Lateral rotation of extended thigh

Abduction of flexed thigh

Obturator internus (innervation)

Nerve to obturator internus and superior gamellus (L5-S2)

Obturator internus (action)

Lateral rotation of extended thigh

Abduction of flexed thigh

Quadratus femoris (innervation)

Nerve to quadratus femoris and inferior gamellus (L5-S1)

Quadratus femoris (action)

Lateral rotation of extended thigh

Abduction of flexed thigh

Semimembranosus (innervation)

Sciatic (L4-S3)

Semitendinosus (innervation)

Sciatic (L4-S3)

Long head of biceps femoris (innervation)

Sciatic (L4-S3)

Adductor magnus (hamstring part - innervation)

Sciatic (L4-S3)

Semimembranosus (action)

Extension of thigh

Flexion of knee

Long head of biceps femoris (action)

Extension of thigh

Flexion of knee

Adductor magnus (hamstring part - action)

Extension of thigh

Flexion of knee

Short head of biceps femoris (innervation)

Nerve to biceps femoris

• a branch of common fibular (which is a brand of sciatic)

Short head of biceps femoris (action)

Knee flexion

Gastrocnemius (innervation)

Tibial

• a branch of sciatic

Soleus (innervation)

Tibial

• a branch of sciatic

Plantaris (innervation)

Tibial

• a branch of sciatic

Popliteus (innervation)

Tibial

• a branch of sciatic

Tibialis posterior (innervation)

Tibial

• a branch of sciatic

Flexor digitorum longus (innervation)

Tibial

• a branch of sciatic

Flexor hallucis (innervation)

Tibial

• a branch of sciatic

Gastrocnemius (action)

Plantar flexion of foot

Flexion of digits

Soleus (action)

Plantar flexion of foot

Flexion of digits

Plantaris (action)

Plantar flexion of foot

Flexion of digits

Popliteus (action)

Plantar flexion of foot

Flexion of digits

Tibialis posterior (action)

Plantar flexion of foot

Flexion of digits

Flexor digitorum longus (action)

Plantar flexion of foot

Flexion of digits

Flexor hallucis (action)

Plantar flexion of foot

Flexion of digits

Tibialis anterior (innervation)

Deep peroneal

• a branch of common fibular, which is a branch of sciatic

Extensor hallucis longus (innervation)

Deep peroneal

• a branch of common fibular, which is a branch of sciatic

Extensor digitorum longus (innervation)

Deep peroneal

• a branch of common fibular, which is a branch of sciatic

Fibularis tertius (innervation)

Deep peroneal

• a branch of common fibular, which is a branch of sciatic

Tibialis anterior (action)

Dorsiflexion

Inversion

Extension of digits

Extensor hallucis longus (action)

Dorsiflexion

Inversion

Extension of digits

Extensor digitorum longus (action)

Dorsiflexion

Inversion

Extension of digits

Fibularis tertius (action)

Dorsiflexion

Inversion

Extension of digits

Fibularis longus (innervation)

Superficial fibular/peroneal

• a branch of common fibular (which is a branch of sciatic)

Fibularis brevis (innervation)

Superficial fibular/peroneal

• a branch of common fibular (which is a branch of sciatic)

Fibularis longus (action)

Plantarflexion

Eversion

Fibularis brevis (action)

Plantarflexion

Eversion

Semitendinosus (action)

Extension of thigh

Flexion of knee