Muscles of the Forearm and Lower Leg

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Presentation transcript:

Muscles of the Forearm and Lower Leg

Muscles of the Forearm Posterior extensors: Anterior flexors: Extensor carpi radialis longus Extensor digitorum Extensor carpi ulnaris Anterior flexors: Flexor carpi radialis Flexor carpi ulnaris Flexor digitorum Palmaris longus

Brachioradialis origin: lateral epicondyle of humerus. insertion: styloid of radius. action: synergist in forearm flexion. Ext. carpi radialis longus origin: later epicondyle of humerus. insertion: metacarpals. action: extends wrist.

Extensor carpi ulnaris origin: Lateral epicondyle of humerus. insertion: metacarpals. action: extends wrist. Extensor digitorum insertion: phalanges. action: extends fingers 2-5.

Palmaris longus origin: medial epicondyle of humerus. insertion: fascia of palm. action: "squeezes palm". Flex. carpi ulnaris origin: medial epicondyle of humerus. insertion: metacarpals. action: flexes wrist. Flex. carpi radialis

Retinacula Flexor digitorm origin: medial epicondyle of humerus. insertion: phalanges. action: flexes fingers 2-5. Retinacula

Posterior compartment: -Gastrocnemius -Soleus

Muscle: Origin: Insertion: Action Gastrocnemius Lateral and medial femoral condyles. Calcaneus via the “Achilles ” tendon Plantar flexion of foot. Soleus Head and shaft of fibula. Calcaneus via the “Achilles” tendon

Anterior/lateral compartments: -Tibialis anterior -Extensor digitorum longus -Fibularis longus

Muscle: Origin: Insertion: Action: Tibialis anterior Lateral condyle of tibia. First metatarsal and cuneiform bone. Dorsiflexion and inversion of foot. Extensor digitorum longus Toes (phalanges) 2 thru 5. Extension of toes 2 thru 5. Fibularis longus Lateral condyle of tibia and fibula head and shaft. Plantar flexion and eversion of foot .

Compartment Syndrome: increased pressure in a muscle compartment