Lab Practical #2 (orgin, insertion, action only)

Iliopsoas Origin

iliac fossa, body of T12 and all lumbar vertebrae.

Iliopsoas Insertion

Lesser trochanter of the femur.

Iliopsoas Action

Flexion of the thigh and flexing the trunk.

Sartorius Origin

Anterior superior iliac spine.

Sartorius Insertion

Proximal medial shaft of the tibia.

Sartorius Action

Flexion and lateral rotation of thigh

Tensor fasciae latae Origin

Anterior superior iliac spine

Tensor fasciae latae Insertion

Lateral condyle of the tibia via the IT band.

Tensor fasciae latae Action

Internal rotation of the thigh, external rotation of the leg

Rectus Femoris Origin

Anterior inferior iliac spine and groove superior to acetabulum.

Rectus Femoris Insertion

Patella

Rectus Femoris Action

Extension of the leg and flexion of the thigh.

Vastus Lateralis Origin

Lateral side of greater trochanter and linea aspera.

Vastus Lateralis Insertion

Patella

Vastus Lateralis Action

Extension of the leg and stabilization of the knee.

Vastus Medialis Origin

Medial side of intertrochanteric line and linea aspera.

Vastus Medialis Insertion

Patella

Vastus Medialis Action

Extension of the leg.

Vastus Intermedius Origin

Anterolateral surface of shaft of femur.

Vastus Intermedius Insertion

Patella via common quadriceps tendon.

Vastus Intermedius Action

Extension of the leg.

Quadriceps Femoris Group Action

Prime mover of knee extension.

Gracilis Origin

Body and inferior ramus of pubis.

Gracilis Insertion

Proximal medial shaft of the tibia.

Gracilis Action

Adduction of the thigh, and flexion and medial rotation of the leg.

Adductor Magnus Origin

Inferior ramus of pubis, ramus and tuberosity of ischium.

Adductor Magnus Insertion

Gluteal tuberosity, linea aspera, and adductor tubercle of femur.

Adductor Magnus Action

Adduction, medial rotation, and extension of the thigh.

Adductor Longus Origin

Body and inferior ramus of pubis.

Adductor Longus Insertion

Linea aspera.

Adductor Longus Action

Adduction, medial rotation, and flexion of the thigh.

Adductor Brevis Origin

Anterior body of pubis.

Adductor Brevis Insertion

Linea aspera.

Adductor Brevis Action

Thigh flexion, thigh adduction, and thigh external rotation.

Adductor Group Action

Adduction, medial/external rotation, flexion, and extension of the thigh.

Gluteus Maximus Origin

Ala of ilium, sacrum, and coccyx.

Gluteus Maximus Insertion

Iliotibial tract and gluteal tuberosity of femur.

Gluteus Maximus Action

Extension, lateral rotation, and abduction of the thigh.

Gluteus Medius Origin

Ala of ilium.

Gluteus Medius Insertion

Greater trochanter of femur.

Gluteus Medius Action

Abducts and medially rotates the thigh; lowers pelvis on weight-bearing side.

Piriformis Origin

Anterior surface of sacrum.

Piriformis Insertion

Greater trochanter of femur.

Piriformis Action

Lateral rotation and extension of the thigh.

Biceps Femoris Origin

Ischial tuberosity.

Biceps Femoris Insertion

Head of fibula.

Biceps Femoris Action

Flexion of the leg and extension of the thigh.

Semitendinosus Origin

Ischial tuberosity.

Semitendinosus Insertion

Proximal medial shaft of tibia.

Semitendinosus Action

Flexion of the leg and extension of the thigh.

Semimembranosus Origin

Ischial tuberosity.

Semimembranosus Insertion

Medial condyle of tibia.

Semimembranosus Action

Flexion of the leg and extension of the thigh.

Hamstring Group Action

Flexion of the leg and extension of the thigh.

Tibialis Anterior Origin

Anterior lateral shaft of tibia and interosseous membrane.

Tibialis Anterior Insertion

First metatarsal and medial cuneiform.

Tibialis Anterior Action

Dorsiflexion and inversion of the foot.

Extensor Digitorum Longus Origin

Lateral condyle of tibia, anterior shaft of fibula, interosseous membrane.

Extensor Digitorum Longus Insertion

Distal phalanges of toes 2-5.

Extensor Digitorum Longus Action

Extension of toes 2-5, dorsiflexion, and eversion.

Extensor Digitorum Brevis Origin

Dorsal calcaneus.

Extensor Digitorum Brevis Insertion

Joins tendons of extensor digitorum longus to middle phalanx of toes 2-4.

Extensor Digitorum Brevis Action

Extension of toes 2-4.

Fibularis (Longus and Brevis) Origin

Shaft of fibula.

Fibularis (Longus and Brevis) Insertion

Longus: metatarsal I and medial cuneiform; Brevis: metatarsal V.

Fibularis (Longus and Brevis) Action

Eversion and plantar flexion of the foot.

Gastrocnemius Origin

Medial and lateral condyles of femur.

Gastrocnemius Insertion

Calcaneus.

Gastrocnemius Action

Plantar flexion of the foot and flexion of the leg.

Soleus Origin

Proximal posterior shaft of tibia and fibula.

Soleus Insertion

Calcaneus through calcaneal tendon.

Soleus Action

Plantar flexion of the foot.

Flexor Digitorum Origin

Posterior middle shaft of tibia.

Flexor Digitorum Insertion

Distal phalanges of toes 2-5.

Flexor Digitorum Action

Flexion of toes 2-5, plantar flexion of foot, and inversion of foot.

Frontalis Origin

Epicranial aponeurosis.

Frontalis Insertion

Skin of eyebrow and forehead.

Frontalis Action

Elevation of eyebrows, creases skin of forehead.

Orbicularis Oculi Origin

Frontal bone and maxilla.

Orbicularis Oculi Insertion

Fibers blend at lateral side of orbit.

Orbicularis Oculi Action

Closes eyelids.

Zygomaticus Major Origin

Zygomatic bone.

Zygomaticus Major Insertion

Skin at angle of mouth.

Zygomaticus Major Action

Elevates mouth upward.

Zygomaticus Minor Origin

Zygomatic bone.

Zygomaticus Minor Insertion

Blends with muscles of upper lip.

Zygomaticus Minor Action

Elevates upper lip.

Orbicularis Oris Origin

Skin around mouth, midline of mandible and maxilla.

Orbicularis Oris Insertion

Lips.

Orbicularis Oris Action

Closes and protrudes lips.

Buccinator Origin

Molar region of maxilla and mandible.

Buccinator Insertion

Blends with orbicularis oris muscle.

Buccinator Action

Compression of cheeks.

Mentalis Origin

Mandible.

Mentalis Insertion

Skin of chin.

Mentalis Action

Elevates, everts, and protrudes lower lip, wrinkles skin of chin.

Masseter Origin

Zygomatic arch and bone.

Masseter Insertion

Mandible (external surface of angle and ramus).

Masseter Action

Closes jaw, elevation and protraction of mandible.

Temporalis Origin

Temporal bone (fossa).