Lower Extremity Flashcards
Abductor digiti minimi ACTION
Flexes 5th toe
Assists with abduction
Abductor digiti minimi INSERTION
Smooth groove on plantar surface of the base of 5th
metatarsal and is attached with the FDMB to the lateral side of the base of the proximal phalanx of the 5th toe
Abductor digiti minimi NERVE
Lateral Plantar n. (S1,S2,S3)
Abductor digiti minimi ORIGIN
Both processes of the calcaneal tuberosity, from the plantar surface of the bone between them, from the plantar aponeurosis, and from the intermuscular septum between the ADM and FDB
Abductor Hallucis ACTION
Abduction of MTP of great toe
Assists in flexion
Assists in adduction of the forefoot
Abductor Hallucis INSERTION
Medial side of base of proximal phalanx of great toe. Some fibers are attached to medial sesmoid bone, and a tendinous slip may extend to the base of the proximal phalanx of the great toe
Abductor Hallucis NERVE
Medial Plantar n. (S1,S2)
Abductor Hallucis ORIGIN
Medial process of tuberosity of calcaneus, flexor retinaculum, plantar aponeurosis, and adjacent intermuscular septum
Adductor brevis FUNCTION
Hip adduction and flexion
Adductor brevis INSERTION
Distal 2/3 of pectineal line and proximal 1/2 of medial lip of linea aspera
Adductor brevis NERVE
Obturator n. (L2, L3, L4)
Adductor brevis ORIGIN
Outer surface of inferior ramus of pubis
Adductor Hallucis ACTION
Adduction
Assists in flexion of MTP of great toe
Adductor Hallucis INSERTION
Lateral side of base of proximal phalanx of great toe
Adductor Hallucis NERVE
Lateral Plantar n. (S2,S3)
Adductor Hallucis ORIGIN
OBLIQUE HD:
From bases of 2-4th metatarsal bones and sheath of fibularis longus tendon
TRANSVERSE HD:
From plantar MTP ligaments of 3-5th digits and deep transverse ligament
Adductor Longus FUNCTION
Hip adduction and flexion
Adductor Longus INSERTION
Middle 1/3 of medial lip of linea aspera
Adductor Longus NERVE
Obturator n. (L2, L3, L4)
Adductor Longus ORIGIN
Anterior surface of pubis at intersection of crest and symphysis
Adductor magnus FUNCTION
Hip adduction, flexion, and extension
Adductor magnus INSERTION
Medial to gluteal tuberosity, middle line of linea aspera, medial supracondylar line, and adductor tubercle of medial condyle of femur.
Adductor magnus NERVE
Obturator n. (L2, L3, L4)
Tibial division of sciatic (L4,L5,S1)
Adductor magnus ORIGIN
Inferior pubic ramus, ramus of ischium (anterior fibers), and ischial tuberosity (posterior)
Biceps Femoris (long head) FUNCTION
Knee flexion and lateral rotation
Hip extension
Assists in hip lateral rotation
Biceps Femoris (long head) INSERTION
Lateral side of head of fibular head, lateral condyle of tibia, deep fascia, lateral side of leg
Biceps Femoris (long head) NERVE
Tibial n. (L5,S1,S2,S3)
Biceps Femoris (long head) ORIGIN
Distal part of sacrotuberous ligament, posterior part of ischial tuberosity
Biceps Femoris (short head) FUNCTION
Knee flexion and lateral rotation
Biceps Femoris (short head) INSERTION
Lateral side of fibular head, lateral tibial condyle, deep fascia lateral side of leg
Biceps Femoris (short head) NERVE
Common fibular n. (L5,S1,S2)
Biceps Femoris (short head) ORIGIN
Lateral lip of linea aspera, proximal 2/3 of supracondylar line, and lateral inter muscular septum
Extensor Digitorum Longus ACTION
Extend MTP joints
Assists in extension of IP 2-5
DF and EV
Extensor Digitorum Longus INSERTION
By 4 tendons to the 2-5th digits, each tendon forms an expansion on the dorsal surface of the toe, and divides
into an intermediate slip attached to base of middle phalanx and into 2 lateral slips
Extensor Digitorum Longus NERVE
Deep Fibular n. (L4, L5, S1)
Extensor Digitorum Longus ORIGIN
Lateral condyle of tibia, proximal ¾ of anterior surface of body of fibula, proximal part of interosseous membrane, adjacent intermuscular septa, and deep fascia
Extensor Hallucis Brevis ACTION
Great toe MTP Extension
Extensor Hallucis Brevis INSERTION
Dorsal surface of base of proximal phalanx of great toe
Extensor Hallucis Brevis NERVE
Deep Fibular n. (L4,L5,S1)
Extensor Hallucis Brevis ORIGIN
Distal part of superior and lateral surfaces of calcaneus, lateral talocalcaneal ligament, and apex of inferior extensor retinaculum
Extensor Hallucis Longus ACTION
Great toe IP and MTP extension
Assist in inversion of foot and dorsiflexion of ankle
Extensor Hallucis Longus INSERTION
Base of dorsal distal phalanx of great toe
Extensor Hallucis Longus NERVE
Deep Fibular n. (L4,L5, S1)
Extensor Hallucis Longus ORIGIN
Middle 2 quarters of anterior surface of fibula and adjacent interosseous membrane
Fibularis Brevis ACTION
Eversion
Assists in plantar flexion
Fibularis Brevis INSERTION
Tuberosity at base of 5th metatarsal bone, lateral side
Fibularis Brevis NERVE
Superficial Fibular n. (L4,L5,S1)
Fibularis Brevis ORIGIN
Distal 2/3 of lateral surface of fibula and adjacent intermuscular septa
Fibularis Longus ACTION
Eversion
Assists in plantar flexion and depresses first metatarsal head
Fibularis Longus INSERTION
Lateral side of base of 1st metatarsal and of medial cuneiform bone
Fibularis Longus NERVE
Superficial Fibular n. (L4,L5,S1)
Fibularis Longus ORIGIN
Lateral tibial condyle, head and proximal 2/3 of lateral surface of fibula, intermuscular septa, and adjacent deep fascia
Fibularis Tertius ACTION
Ankle DF
Foot Eversion
Fibularis Tertius INSERTION
Dorsal surface, base of 5th metatarsal
Fibularis Tertius NERVE
Deep Fibular n. (L4-L5-S1)
Fibularis Tertius ORIGIN
Distal 1/3 of anterior surface of fibula, interosseous membrane and adjacent intermuscular septa
Flexor digiti minimi brevis ACTION
MTP flexion of 5th digit
Flexor digiti minimi brevis INSERTION
Distal tendon that inserts into the lateral side of the base of the proximal phalanx of the minimus (5th digit).
Flexor digiti minimi brevis NERVE
Lateral Plantar n. (S2, S3)
Flexor digiti minimi brevis ORIGIN
Medial part of the plantar surface of the base of the 5th metatarsal bone and from the sheath of the fibularis longus
Flexor digitorum longus FUNCTION
Flexion of PIP, DIP and MTP of digits 2.5
Assists in ankle plantar flexion and foot inversion
Flexor digitorum longus INSERTION
Bases of distal phalanges of 2nd through 5th digits
Flexor digitorum longus NERVE
Tibial n. (L5,S1,S2)
Flexor digitorum longus ORIGIN
Middle 3/5 of posterior surface of body of tibia and from fascia covering the posterior tibialis
Flexor digitorum
brevis ACTION
PIP Flexion
Assists in flexion of 2-5th MTP
Flexor digitorum
brevis INSERTION
Middle phalanx of 2-5th digits
Flexor digitorum
brevis NERVE
Medial Plantar n. (S1,S2)
Flexor digitorum
brevis ORIGIN
Medial process of tuberosity of calcaneus, central part of plantar aponeurosis and adjacent intermuscualr septa
Flexor hallucis brevis ACTION
Flexion of MTP of great toe
Flexor hallucis brevis INSERTION
Medial and lateral sides of base of proximal phalanx of great toe
Flexor hallucis brevis NERVE
Medial Plantar n. (S1,S2)
Flexor hallucis brevis ORIGIN
Medial part of plantar surface of cuboid bone, adjacent part of lateral cuneiform bone, and from prolongation of tendon of posterior tibialis
Flexor hallucis longus FUNCTION
Great toe IP flexion
Assists in metatarsophalangeal flexion
Ankle plantar flexion
Foot inversion
Flexor hallucis longus INSERTION
Base of distal phalanx of great toe and plantar surface
Flexor hallucis longus NERVE
Tibial n. (L5,S1,S2)
Flexor hallucis longus ORIGIN
Posterior surfac of distal 2/3 of fibula, interosseous membrane, and adjacent intermuscular septa and fascia
Gastrocnemius (lateral head) FUNCTION
Talocrural plantar flexion
Assists in knee flexion
Gastrocnemius (lateral head) INSERTION
Middle part of posterior surface of calcaneus
Gastrocnemius (lateral head) NERVE
Tibial n. (S1, S2)
Gastrocnemius (lateral head) ORIGIN
Lateral condyle and posterior surface of femur, capsule of knee
Gastrocnemius (medial head) FUNCTION
Talocrural plantar flexion
Assits in knee flexion
Subtalar joint inversion (supination)
Gastrocnemius (medial head) INSERTION
Middle part of posterior surface of calcaneus
Gastrocnemius (medial head) NERVE
Tibial n. (S1,S2)
Gastrocnemius (medial head) ORIGIN
Proximal and posterior part of medial condyle and adjacent part of femur, capsule of knee joint
Gluteus maximus FUNCTION
Hip extension and lateral rotation
Lower fibers: assists in hip adduction
Upper fibers: assists in abduction, stabilize knee in extension through iliotibial band insertion
Gluteus maximus INSERTION
Larger proximal part and superficial fibers of distal portion of muscle into iliotibial tract of fascia lata
Deep fibers of distal part into gluteal tuberosity of femur
Gluteus maximus NERVE
Inferior gluteal n. (L5, S1, S2)
Gluteus maximus ORIGIN
Posterior gluteal line of ilium and portion of bone superior and posterior to it, posterior surface of lower part of sacrum, side of coccyx, aponeurosis of erector spinae, sacrotuberous ligament, and gluteal aponeurosis
Gluteus medius FUNCTION
Abduct hip
Anterior fibers: hip medial rotation and assist with hip flexion
Posterior fibers: hip lateral rotation and assist with hip extension
Gluteus medius INSERTION
Oblique ridge of lateral surface of greater trochanter of femur
Gluteus medius NERVE
Superior gluteal n. (L4,L5, S1)
Gluteus medius ORIGIN
External surface of ilium between iliac crest and posterior gluteal line dorsally and anterior gluteal line ventrally, and gluteal tuberosity
Gluteus minimus FUNCTION
Hip Abduction and MR
Assist with with hip flexion
Gluteus minimus INSERTION
Anterior border of greater trochanter
Hip joint capsule
Gluteus minimus NERVE
Superior gluteal n. (L4,L5, S1)
Gluteus minimus ORIGIN
External surface of ilium between anterior and inferior gluteal lines, and margin of greater sciatic notch
Gracilis FUNCTION
Adduct hip
Assists in knee medial rotation and flexion
Gracilis INSERTION
Medial surface of body of tibia, distal to condyle, proximal to insertion of semitendinosus, and posterior to insertion of sartorius
Gracilis NERVE
Obturator n. (L2,L3,L4)
Gracilis ORIGIN
Inferior 1/2 of pubic symphysis and medial margin of inferior ramus of pubis
Iliopsoas (Iliacus) FUNCTION
Flexes hip
Assists in hip lateral rotation and abduction
With insertion fixed:
- Billaterally: flexes trunk on femurs, increases lumbar lordosis
- Unilaterally: Assists in lateral flexion of trunk to same side
If trunk is stable, contribute to anterior shear of lumbar spine.
Iliopsoas (Iliacus) INSERTION
Lesser trochanter of femur
Iliopsoas (Iliacus) NERVE
Femoral n. (L1,L2,L3,L4)
Iliopsoas (Iliacus)ORIGIN
Superior 2/3 iliac fossa, internal lip of iliac crest, iliolumbar and ventral SI ligaments and sacral ala
Iliopsoas (Psoas Major) FUNCTION
Flexes hip
Assists in hip lateral rotation and abduction
With insertion fixed:
- Billaterally: flexes trunk on femurs, increases lumbar lordosis
- Unilaterally: Assists in lateral flexion of trunk to same side
If trunk is stable, contribute to anterior shear of lumbar spine.
Iliopsoas (Psoas Major) INSERTION
Lesser trochanter of femur
Iliopsoas (Psoas Major) NERVE
Anterior rami of Lumbar spinal n. (L1,L2,L3,L4)
Iliopsoas (Psoas Major) ORIGIN
Ventral surface of transverse processes of all lumbar vertebrae, sides of bodies and corresponding intervertebral discs of last thoracic and all lumbar vertebrae and membranous arches that extend over sides of lumbar vertebrae.
Inferior Gemelli FUNCTION
Laterally rotate extended hip
Abduct flexed hip
Stabilize femoral head in acetabulum
Inferior Gemelli INSERTION
With the tendon of Obturator Internus into medial surface of greater trochanter
Inferior Gemelli NERVE
N. to quadratus femoris (L5, S1)
Inferior Gemelli ORIGIN
Proximal part of tuberosity of ischium
Interossei ACTION
PLANTAR (3):
ADD 3-5th digits toward axial line through the 2nd digit.
Assists in MTP flexion
Assist in extension of IP3-5th
DORSAL (4)
Abduct 2-4th digits from axial line through the 2nd digits.
Assists in MTP flexion and extension of 2-4th IP
Interossei INSERTION
PLANTAR (3)L:
Medial sides of bases of proximal phalanges of same digit
DORSAL (4):
Side of proximal phalanx and capsule of 1st MTP joint to
medial side of 2nd digit, other 3 to lateral sides of 2-4th digits
Interossei NERVE
Lateral Plantar n. (S2,S3)
Interossei ORIGIN
PLANTAR (3):
Bases and medial sides of bodies of 3-5th metatarsal bones
DORSAL (4):
Each by 2 heads from adjacent sides of the metatarsal bones
Lumbricals ACTION
MTP flexion
Assists in IP 2-5th extension
Lumbricals INSERTION
Medial side of proximal phalanx and dorsal expansion of EDL tendon of 2nd – 5th digits
Lumbricals NERVE
1 - Medial Plantar n. (S1,S2)
2-4: Medial Plantar n. (S2,S3)
Lumbricals ORIGIN
1st from medial side of 1st FDL tendon, 2nd from adjacent sides of 1st and 2nd FDL tendons, 3rd from adjacent sides of 2nd and 3rd FDL tendons, 4th from adjacent sides of 3rd and 4th FDL tendons
Obturator Externus FUNCTION
Laterally rotation of thigh and assists hip adduction
Obturator Externus INSERTION
Trochanteric fossa of femur
Obturator Externus NERVE
Obturator n. (L3, L4)
Obturator Externus ORIGIN
Rami of pubis and ischium and external surface of obturator membrane
Obturator Internus FUNCTION
Laterally rotate extended hip
Abducts flexed hip
Assists hip extension
Stabilizes femoral head in acetabulum
Obturator Internus INSERTION
Medial surface of greater trochanter
Obturator Internus NERVE
N. to Obturator Internus (L5, S1)
Obturator Internus ORIGIN
Internal/pelvic surface of obturator membrane and margin of obturator foramen, pelvic surface of ischium, posterior and proximal to obturator foramen, and to slight extent from the obturator fascia
Pectineus FUNCTION
Hip adduction and flexion
Pectineus INSERTION
Pectineal line of femur
Pectineus NERVE
Femoral n., accessory obturator (L2, L3,L4)
Pectineus ORIGIN
Surface of superior ramus of pubis ventral to pectin between iliopectineal eminence and pubic tubercle
Piriformis FUNCTION
Laterally rotate extended hip
Abducts flexed hip
Assists hip extension
Stabilizes femoral head in acetabulum
Piriformis INSERTION
Superior border of greater trochanter
Piriformis NERVE
N. to Piriformis (L5,S1,S2)
Piriformis ORIGIN
Surface of sacrum between 1,2,3 and 4 pelvic sacrum foramina, margin of greater sciatic foramen, and pelvic surface of sacrotuberous ligament
Plantaris FUNCTION
Plantar flexion
Assists in knee flexion
Plantaris INSERTION
Posterior part of calcaneus
Plantaris NERVE
Tibial n. (L4,L5,S1,S2)
Plantaris ORIGIN
Distal part of lateral supracondylar line of femur and adjacent part of its popliteal surface, oblique popliteal ligament of knee joint
Popliteus ACTION
NWB:
MR of tibia on the femur
Knee flexion
WB:
LR of femur on tibia
Knee flexion
Helps reinforce posterior ligament of knee joint
Popliteus INSERTION
Triangular area proximal to soleal line on posterior surface of tibia, and fascia covering the muscle
Popliteus NERVE
Tibial n. (L4, L5, S1)
Popliteus ORIGIN
Anterior part of groove on lateral condyle of femur, and oblique popliteal ligament of knee joint
Quadratus femoris FUNCTION
Laterally rotate extended hip
Abducts flexed hip
Assists hip extension
Stabilizes femoral head in acetabulum
Quadratus femoris INSERTION
Proximal part of quadrate line extending distally from intertrochanteric crest
Quadratus femoris NERVE
N. to quadratus femoris (L5, S1)
Quadratus femoris ORIGIN
Proximal part of lateral border of tuberosity of ischium
Quadratus plantae ACTION
Modifies line of pull of the flexor digitorum longus tendons, and assists in flexion of 2-5th digits
Quadratus plantae INSERTION
Lateral margin and dorsal and plantar surfaces of tendon of flexor digitorum longus
Quadratus plantae NERVE
Lateral Plantar n. (S1,S2,S3)
Quadratus plantae ORIGIN
MEDIAL HEAD
Medial surface of calcaneus, and medial border of long plantar ligament
LATERAL HEAD
Lateral border of plantar surface of calcaneus, and lateral border of long plantar ligament
Rectus femoris FUNCTION
Extends knee
Assists iliopsoas to flex thigh
Rectus femoris INSERTION
Proximal border of patella and through patellar ligament to tibial tuberosity
Rectus femoris NERVE
Femoral n. (L2, L3, L4)
Rectus femoris ORIGIN
Straight Head: AIIS and superior rim of acetabulum
Reflected Heah: From groove above rim of acetabulum
Sartorius FUNCTION
Flexion, abduction and lateral rotation of thigh
Sartorius INSERTION
Proximal part of medial surface of tibia near anterior border
Sartorius NERVE
Femoral n. (L2,3,4)
Sartorius ORIGIN
ASIS and superior 1/2 of notch just distal to spine
Semimembranosus FUNCTION
Knee flexion and medial rotation
Hip extension
Assists in hip medial rotation
Semimembranosus INSERTION
Posteromedial aspect of medial condyle of tibia
Semimembranosus NERVE
Tibial n. (L4,L5,S1,S2)
Semimembranosus ORIGIN
Ischial tuberosity, proximal and lateral to biceps femoris and semitendinosis
Semitendinosus FUNCTION
Knee flexion and medial rotation
Hip extension
Assists in hip medial rotation
Semitendinosus INSERTION
Proximal part of medial surface of body of tibia, deep fascia of leg
Semitendinosus NERVE
Tibial n. (L4,L5,S1,S2)
Semitendinosus ORIGIN
Ischial tuberosity by tendon common with long head of biceps femoris
Soleus FUNCTION
Talocrural plantar flexion
Subtalar joint inversion (supination)
Soleus INSERTION
Posterior part of calcaneus
Soleus NERVE
Tibial n. (S1, S2)
Soleus ORIGIN
Posterior surfaces of head of fibula and proximal 1/3 of its body, soleal line, and middle 1/3 of medial border of tibia, tendinous arch between tibia and fibula
Superior Gemelli FUNCTION
Laterally rotate extended hip
Abduct flexed hip
Stabilize femoral head in acetabulum
Superior Gemelli INSERTION
With tendon of Obturator Internus into medial surface of greater trochanter
Superior Gemelli NERVE
N. to Obturator Internus (L5, S1)
Superior Gemelli ORIGIN
External surface of ischial spine
Tensor fasciae latae FUNCTION
Abduction, medial rotation and flexion of thigh. Assists in keeping knee extended
Tensor fasciae latae INSERTION
Into iliotibial tract of fascia lata at junction of proximal and middle thirds of thigh.
Tensor fasciae latae NERVE
Superior gluteal n. (L4, L5, S1)
Tensor fasciae latae ORIGIN
Anterior part of the external lip of iliac crest, outer surface of ASIS, and deep surface of fascia lata.
Tibialis Anterior ACTION
Ankle dorsiflexion
Assists in foot inversion
Tibialis Anterior INSERTION
Medial and plantar surface of medial cuneiform, base of 1st metatarsal bone
Tibialis Anterior NERVE
Deep Fibular n. (L4,L5,S1)
Tibialis Anterior ORIGIN
Lateral condyle and proximal 1/2 of lateral surface of tibia, lateral talocalcaneal ligament, and apex of inferior extensor retinaculum
Tibialis Posterior ACTION
Inversion
Assists in ankle plantar flexion
Tibialis Posterior INSERTION
Tuberosity of navicular bone and by fibrous expansions to the sustentaculum talk, all cuneiforms, cuboid, and bases of 2nd,3rd and 4th metatarsal bones
Tibialis Posterior NERVE
Tibial n. (L4, L5, S1)
Tibialis Posterior ORIGIN
Most of interosseous membrane, lateral portion of posterior surface of tibia, proximal 2/3 of medial surface of fibula, adjacent inter-muscular septa, and deep fascia
Vastus intermedius FUNCTION
Extend knee
Vastus intermedius INSERTION
Proximal border of patella and through patellar ligament to tibial tuberosity.
Vastus intermedius NERVE
Femoral n. (L2, L3, L4)
Vastus intermedius ORIGIN
Anterior and lateral surfaces of proximal 2/3 of body of femur, distal 1/2 of linea aspera, and lateral intermuscular septum.
Vastus lateralis FUNCTION
Extend knee
Vastus lateralis INSERTION
Proximal border of patella and through patellar ligament to tibial tuberosity.
Vastus lateralis NERVE
Femoral n. (L2, L3, L4)
Vastus lateralis ORIGIN
Proximal part of intertrochanteric line, anterior and inferior borders of greater trochanter, lateral lip of gluteal tuberosity, proximal 1/2 of lateral lip of linea aspera, and lateral inter muscular septum.
Vastus medialis FUNCTION
Extend knee
Vastus medialis INSERTION
Proximal border of patella and through patellar ligament to tibial tuberosity.
Vastus medialis NERVE
Femoral n. (L2, L3, L4)
Vastus medialis ORIGIN
Distal 1/2 of intertrochanteric line, medial lip of linea aspera, proximal part of medial suprocondylar line, tendons of adductor longus and adductor magnus, and medial inter muscular septum.