Muscles Of The Human Body

Action: raises eyebrows and wrinkles forehead.

Action: closes eyelids; used in blinking, winking, and squinting.

Action: compresses, contracts, puckers and wrinkles the lips; Flat band around the upper and lower lips.

Action: draws lips into the grinning expression;

Action: compresses cheek, allowing for rapid changes in volume of mouth cavity.

Action: raises the lower jaw and is used in chewing.

Action: closes jaw, elevates and retracts mandible; Description: muscle extending from the temporal fossa to the coronoid process of the mandible.

Action: elevates and protracts and moves mandible from side to side

Action: grinding movement, depresses and protracts mandible and moves it from side to side.

Action: elevates the hyoid and base of the tongue. Forms the floor of the mouth.

Action: elevates and retracts the hyoid bone during swallowing.

Action: elevates the hyoid bone. Depresses the mandible (opens the mouth).

Action: depresses the larynx and hyoid bone.

Action: depresses the larynx and hyoid bone.

Action: flexion of neck forward, rotates the head to opposite shoulder.

Action: elevates ribs 1 and 2, aid in inspiration.

Action: extends or hyperextends the head. rotates head to same side of the muscle.

Action: Respiration, most important muscle in inspiration.

Action: draw ribs downward and inward to compress thoracic cavity and force air from lungs; not needed for relaxed expiration.

Action: pulls ribs toward one another to elevate rib cage.

Action: flexes and rotates vertebral column.

Action: compresses abdominal content.

Action: laterally flexes the spine.

Action: extends the vertebral column laterally.

Action: rotates the arm.

Action: rotates the arm.

Action: prime mover that holds the scapula against the ribs.

Action: raises, rotates, and adducts the arm.

Action: elevates and adducts the scapula.

Action: stabilize and retract scapula; pulls shoulders back (2 muscles).

Action: extends, adducts, and medially rotates the arm; draws the shoulder downward and backward.

Action: flexes the humerus,assists to adduct the humerus; Origin: coracoid process of the scapula; Insertion: medial shaft of the humerus at about its middle.

A large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm

Action: extends and medially rotates humerus; contributes to arm swinging. Origin: Inferior angle of scapula. Insertion: Medial lip of intertubercular sulcus of humerus.

Abducts arm; stabilizes the head of the humerus in glenoid cavity; one of the "rotator cuff" muscles

Laterally rotates shoulder; stabilizes the head of the humerus in glenoid cavity; one of the "rotator cuff" muscles

Teres muscle that adducts the arm and rotates it laterally

O: inner surface of scapula | I: lesser tubercle of humerus | A: medial rotation of humerus

Muscle that lies underneath the biceps and is the strongest flexor of the forearm.

Superficial, lateral forearm muscle. Synergist in forearm flexion. Stabilizes elbow.

A muscle that flexes and supinates the forearm, powerful flexor of forearm; origin is glenoid process and coracoid process of scapula, insertion is radial tuberosity.

The skeletal muscle having three origins that extends the forearm when it contracts.

Action: supinates the forearm; Origin: lateral epicondyle of humerus, proximal ulna; Insertion: proximal end of radius

Powerful wrist flexor; abducts hand. Origin: medial epicondyle of humerus; Insertion: palmar aponeurosis.

Action: flexes wrist and adducts hand; Origin: medial epicondyle of humerus; olecranon of ulna; Insertion: pisiform bone; 5th metacarpal.

Action: extends & abducts wrist; Orgin: lateral supracondylar ridge of humerous., insertion: base of metacarpal 2 and 3.

Action: extends and adducts wrist; Origin: lateral epicondyle of humerus; posterior border of ulnar. Insertion: Base of metacarpal 5.

Action: flexes wrist and middle phalanges of fingers 2-5. Deeper muscle , visible at distal end of forearm.

Action: prime mover of finger extension. Extends wrist; Origin: lateral epicondyle of humerus. Insertion: dorsal surfaces of phalanges II - V.

Action: abducts and extends thumb. Origin: posterior surface of radius and ulna; Insertion metacarpal 1 and trapezium.

Action: extends thumb; Origin: dorsal shaft of ulna and radius; Insertion: base of distal phalanx of thumb.

Flexes thigh at the hip

either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh

heaviest muscle in body, extends/straightens leg at hip during walking

Medially rotates thigh; abducts the hip

Medially rotates thigh; abducts the hip

originates on anterior surface of pelvis, inserts on greater trochanter, rotates hip laterally and abducts flexed thigh at hip

..., Adducts and flexes thigh at the hip; assists in medial rotation

..., Adducts and extends thigh at the hip; assists in medial rotation

Adducts and flexes thigh at the hip

Adducts thigh at the hip and flexes leg at the knee; assists in medial rotation

a muscle in the thigh that helps to rotate the leg into the sitting position assumed by a tailor

part of quadriceps group, extends leg at knee

Extends leg at the knee; part of the quadriceps group

Extends leg at the knee; part of the quadriceps group

Action: extension of leg; Origin: femur (anterolateral surface of shaft); Insertion: patella (via a common quadriceps tendon)

Action: flexes leg at knee; extends thigh at hip. Origin: ischial tuberosity. Insertion: shaft of tibia. Location: medial to biceps femoris, superficial to semimembranosus. Nerve: sciatic

Action: flexes leg at knee; extends thigh at hip. Origin: ischial tuberosity. Insertion: medial condyle of tibia. Location: medial hamstring. Nerve: sciatic

O:ischial tuberosity, distal femur I: tendon to insert into head of fibula and lateral condyle of tibia A: Extends thigh and flexes knee

originates on lateral condyle of femur, inserts on posterior surface of tibia, brings knee out of locked full extension

the muscle in the back part of the leg that forms the greater part of the calf

a broad flat muscle in the calf of the leg under the gastrocnemius muscle

front of shin, flexes ankle

Plantar flexion and inversion of foot

O: tibia | I: bases of distal phlanges of toes | A: flexes 4 lateral digits; plantarflexion; aids with inversion; supports foot longitudinal arches; helps toes grip the ground

O: lateral tibial condyle, interosseous membrane, fibula (prox 3/4) / I: via tendon to middle and distal phalanges of 2-5 toes / A: PRIME MOVER toe ext, dorsiflexion of foot synergist of tib ant and extensor hallicus longus

Plantar flexion and eversion of foot; stabilizes the lateral ankle and arch of the foot

anterior part of the external lip of iliac crest, outer surface of ASIS, and deep surface of fascia lata