DPT 642: Practical 2 Muscles

Psoas Minor

Assists flexion of lumbar spine and posterior pelvic tilt.

Psoas Major

Bilaterally flexes hip; when hip is flexed, it extends lumbar spine; when hip is extended, it flexes lumbar spine; unilaterally causes lateral flexion; helps with external rotation when hip is abducted.

Iliacus

Hip flexion; helps with external rotation when hip is abducted.

Pectineus

Adducts, medially rotates, flexes and extends hip depending on position of leg.

Sartorius

Flexes, abducts, and laterally rotates hip; flexes and internally rotates knee.

Adductor Brevis

Adducts, internally rotates, flexes and extends hip depending on position of leg.

Adductor Longus

Adducts, internally rotates, flexes and extends hip depending on position of leg.

Gracilis

Adducts, internally rotates, flexes and extends hip depending on position; internally rotates the knee.

Obturator Externus

External rotation and adduction.

Adductor Magnus

Adducts, internally rotates, flexes and extends hip depending on position of leg.

Gluteus Medius

Abduction; anterior fibers flex and internally rotate, posterior fibers extend and laterally rotate.

Gluteus Minimus

Abducts the hip; upper fibers flex and medially rotate the hip; lower fibers extend and laterally rotate the hip.

Gluteus Maximus

Extends, laterally rotates, and adducts/abducts depending on fibers.

Tensor Fascia Latae

Flexes, abducts, and internally rotates.

Piriformis

External rotation and abduction; when hip is flexed, it internally rotates.

Gemellus Superior

Externally rotates.

Obturator Internus

Externally rotates.

Gemellus Inferior

Externally rotates.

Quadratus Femoris

Externally rotates and adducts.

Biceps Femoris (long head)

Extends hip and flexes knee; laterally rotates knee.

Biceps Femoris (short head)

Flexes knee.

Semitendinosus

Extends hip, flexes and medially rotates knee.

Semimembranosus

Extends hip, flexes and medially rotates knee.

Rectus Femoris

Extends knee and flexes hip.

Vastus Intermedius

Extends knee.

Vastus Lateralis

Extends knee.

Vastus Medialis

Extends knee.

Tibialis Anterior

Dorsiflexes and inverts.

Extensor Hallucis Longus

Extends big toe, dorsiflexes and inverts.

Extensor Digitorum Longus

Extension of digits 2-5, dorsiflexion and eversion.

Fibularis Tertius

Dorsiflexion and eversion.

Fibularis Brevis

Plantarflexion and eversion.

Fibularis Longus

Plantarflexion and eversion.

Gastrocnemius

Knee flexion, plantarflexion, helps supinate; extends knee in closed chain.

Popliteus

Flexes and internally rotates knee.

Soleus

Plantarflexes and helps with supination.

Tibialis Posterior

Plantarflexion and inversion.

Flexor Digitorum Longus

Flexes IP and MTP joints.

Flexor Hallucis Longus

Flexes big toe.