External Oblique

Origin: Outer surfaces of lower ribs

Insertion: Outer lip of iliac crest and linea alba

Action: Tenses abdominal wall and compresses abdominal contents

Internal Oblique

Origin: Crest of ilium and inguinal ligament

Insertion: Cartilages of lower ribs, linea alba, and crest of pubis

Action: Tenses abdominal wall and compresses abdominal contents

Transversus Abdominis

Origin: Costal cartilages of lower ribs, processes of lumbar vertebrae, lip of iliac crest, and inguinal ligament

Insertion: Linea alba and crest of pubis

Action: Tenses abdominal wall and compresses abdominal contents

Rectus Abdominis

Origin: Crest of pubis and symphysis pubis

Insertion: Xiphoid process of sternum and costal cartilages

Action: Tenses abdominal wall and compresses abdominal contents; also flexes vertebral column

Rectus Abdominis

Origin: Crest of pubis and symphysis pubis

Insertion: Xiphoid process of the sternum and costal cartilages

Action: Tenses abdominal wall and compresses abdominal contents; also flexes vertebral column

Levator Ani

Origin: Pubic bone and ischial spine

Insertion: Coccyx

Action: supports pelvic viscera and provides sphincterlike action in anal canal and vagina

Superficial Transversus perinei

Origin: Ischial Tuberosity

Insertion: Central Tendon

Action: Supports pelvic viscera

Bulbospongiosus

Origin: Central Tendon

Insertion: Males-Urogenital diaphragm and fascia of the penis. Females-pubic arch and root of clitoris

Action: Males-Assists emptying of urethra 

Females-Constricts vagina

Ischiocavernosus

Origin: Ischial tuberosity

Insertion: Pubic arch

Action: Assists function of bulbospongiosus

Gluteus Maximus

Origin: Sacrum, coccyx, and posterior

Insertion: Posterior surface of femur and fascia of thigh

Action: Extends thigh

Gluteus Medius

Origin: Lateral surface of ilium

Insertion: Greater trochanter of femur

Action: Abducts and rotates thigh medially

Gluteus Minimus

Gracilis

Origin: Lower edge of symphysis pubis

Insertion: Medial surface of tibia

Actions: Adducts thigh, flexes and rotates lower limb medially

Sartorius

Origin: Anterior superior iliac spine

Insertion: Medial siurface of tibia

Action: Flexes leg and thigh, abducts thigh, rotates thigh laterally, and rotates leg medially

Hamstring Group Biceps Femoris

Origin: Ischial tuberosity and posterior surface of femur

Insertion: head of fibula and lateral condyle of tibia

Action: Flexes leg, extends thigh

Semitendinosus

Origin: Ischial tuberosity

insertion: Medial surface of tibia

Action: Fixes leg, extends thigh

Semimembranosus

Origin: Ischial tuberosity

Insertion: Medial condyle of tibia

Action: Flexes leg, extends thigh

Quadriceps Femoris Group rectus Femoris

Origin: Spine of ilium and margin of acetabulum

Insertion: Patella by the tendon, which continues as patellar ligament to tibial tuberosity

Action: Extends leg at knee

Vastus lateralis

Origin: Greater trochanter and posterior surface of femur

Insertion: Patella by the tendon, which continues as patellar ligament to tibial tuberosity

Action: Extends leg at knee

Vastus Medialis

Origin: Medial surface of femur

Insertion: Patella by the tendon, which continues as patellar ligament to tibial tuberosity

Action: Extends leg at knee

Vastus Intermedius

Origin: Anterior and lateral surfaces of femur

Insertion: Patella by the tendon, which continues as patellar ligament to tibial tuberosity

Action: Extends leg at knee

Tibialis Anterior

Origin: Lateral condyle and lateral surface of tibia

Insertion: Tarsal bone (cuneiform) and first metatarsal

Action: Dorsiflexion and inversion of foot

Gastrocemius

Origin: Lateral and medial condyles of femur

Insertion: Posterior surface of calcaneus

Action: Posterior flexion of foot and flexion of leg at knee

Soleus

Origin: head and shaft of fibula and posterior surface of tibia

Insertion: Posterior surface of calcaneus

Action: Plantar flexion of foot