Motor Tract 5

Attachments: Originates from the medial epicondyle of the humerus and the radius. The muscle splits into four tendons at the wrist, which travel through the carpal tunnel, and attach to the base of the middle phalanx of the four digits.

Actions: Flexes the metacarpophalangeal joints and proximal interphalangeal joints at the 4 fingers, and flexes at the wrist

Attachments: Originates from the tubercle of the trapezium and the associated flexor retinaculum. Inserts onto the lateral margin of the first metacarpal.

Actions: Opposition of the thumb

Attachments: Originates from the posterior surface of the ulna and interosseous membrane. Attaches to the extensor hood of the index finger.

Actions: Extension of the index finger at the interphalangeal and metacarpophalangeal joints 

Attachments: Originates from the coracoid process of the scapula. The muscle passes through the axilla and attaches the medial aspect of the humerus shaft (at the level of the deltoid tubercle).

Function: Flexion of the arm at the shoulder. It is also a weak adductor at the shoulder

Attachments: Originates from the lateral supracondylar ridge of the humerus and attaches to the base of the second metacarpal.

Actions: Extension and abduction at the wrist

Attachments: Originates from the anterior and lateral surfaces of the femoral shaft. It inserts onto the patella via the quadriceps femoris tendon. The patella is then attached to the tibial tuberosity by the patella ligament.

Actions: Extension of the knee joint. It has a secondary function of stabilizing the patella.

Attachments: Short head originates from the linea aspera on posterior surface of the femur. The two heads form a tendon which inserts onto the head of the fibula.

Actions: Flexion and lateral rotation of the knee. Weak extensor and lateral rotator of the thigh.

Attachments: Originates from the soleal line of the tibia and proximal fibula. The muscle converges with the fibers of the gastrocnemius to form the calcaneal tendon, which inserts onto the calcaneus.

Actions: Plantarflexion of the foot at the ankle joint