Muscle 2 Origin, Insertion, and Action

External Abdominal Oblique

Origin: anterior surface of lower 8 ribs

Insertion: abdominal aponeurosis

Action: flexion and rotation of trunk

Internal Abdominal Oblique

Origin: anterior iliac crest

Insertion: abdominal aponeurosis

Action: flexion and rotation of trunk

Transverse Abdominis

Origin: iliac crest

Insertion: abdominal aponeurosis

Action: compression of abdominal cavity

Rectus Abdominis

Origin: pubic symphysis

Insertion: xiphoid process

Action: flexion of trunk

Gluteus Maximus

Origin: sacrum

Insertion: gluteal tuberosity of femur

Action: extension of hip

Gluteus Medius

Origin: lateral surface of ilium

Insertion: greater trochanter of femur

Action: abduction of thigh

Sartorius

Origin: ASIS

Insertion: medial proximal shaft of tibia

Action: lateral rotation of thigh

Iliopsoas

Origin: lumbar vertebrae

Insertion: lesser trochanter of femur

Action: flexion of thigh

Tensor Fasciae Latae

Origin: ASIS

Insertion: iliotibial tract

Action: abduction of thigh

Biceps Femoris

Origin: ischial tuberosity

Insertion: head of fibula

Action: knee flexion (hamstring)

Semimembranosus

Origin: ischial tuberosity

Insertion: medial condyle of tibia

Action: knee flexion (hamstring)

Semitendinosus

Origin: ischial tuberosity

Insertion: medial anterior proximal shaft of tibia

Action: knee flexion (hamstring)

Rectus Femoris

Origin: AIIS

Insertion: patella

Action: knee extension (quadricep)

Vastus Medialis

Origin: linea aspera

Insertion: patella

Action: knee extension (quadricep)

Vastus Lateralis

Origin: linea aspera

Insertion: patella

Action: knee extension (quadricep)

Vastus Intermedius

Origin: anterior shaft of femur

Insertion: patella

Action: knee extension (quadricep)

Gracilis

Origin: body of pubis

Insertion: proximal medial tibia

Action: adduction of thigh

Adductors

Origin: body of pubis

Insertion: linea aspera

Action: adduction of thigh

Gastrocnemius

Origin: lateral condyle of femur

Insertion: calcaneus via the calcaneal tendon

Action: plantar flexion of ankle

Tibialis Anterior

Origin: lateral condyle of tibia

Insertion: first metatarsal

Action: dorsiflexion of ankle

Bend forward with hand on abdomen superior to the navel

rectus abdominus

groove made by lateral margins of rectus abdominis

linea semilunaris

right side intersection of linea semilunaris and costal margin

gallbladder

cough lateral to the rectus abdominis

external abdominal obliques

abduct thigh, between greater trochanter and iliac crest, superior to gluteus maximus

gluteus medius

Injections given in medius, not maximus, because:

sciatic nerve is deep to maximus

flex leg, run hand over posterior thigh

biceps femoris

posterior surface of knee, cord like muscle

semitendinosus

medial to semitendinosus

semimembranosus

depression on the back of the knee

popliteal fossa, where popliteal artery and vein is

inferior border of popliteal fossa

gastrocnemius

proximal anterior medial surface of thigh

adductor

abduct thigh with femur medially rotated, anterior to greater trochanter

tensor fasciae latae

anterior, superior, medial portion of thigh

femoral triangle, with femoral artery and vein