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Muscle Man

TermDefinition
Triceps brachii Only muscle fleshing out the posterior humerus. Its 3 heads arise from the shoulder girdle & proximal humerus, & inserts into the olecranon process of the ulna. This muscle is often called the boxer's muscle because it can deliver a straight-arm KO punch
Biceps brachii The most familiar muscle of the arm because it bulges when the elbow is flexed. It originates by 2 heads from the shoulder girdle & inserts into the radial tuberosity
Brachialis This muscle lies deep to the biceps muscle & is as important as the biceps in elbow flexion. It lifts the ulna as the biceps lifts the radius
Brachioradialis This muscle is fairly weak muscle that arises on the humerus & inserts into the distal forearm
Flexor carpi radialis It is a muscle that is a relatively thin & located on the anterior part of the forearm. It arises in the humerus, close to the wrist area. It is a superficial muscle that becomes very visible as the wrist comes into flexion.
Extensor carpi radialis longus This muscle aids in moving the hand. It abducts & extends the hand at the wrist joint. The muscle originates along the lateral supracondylar ridge, which is a narrow, raised region of the humerus. It inserts into the 3rd metacarpal of the hand
Flexor carpi ulnaris Arises from medial humerus; has an additional attachment point on the head of the ulna; inserts at 2 wrist bones: pisiform & the hook of the hamate; inserts at the base of the pinky finger; works w/ the extensor carpi ulnaris to flex muscles of the wrist
Extensor carpi ulnaris This muscle allows the wrist, or carpus, to extend & bend. It begins on the outer side of the elbow on the lateral epicondyle of the humerus & crosses the forearm downward. It inserts at the base of the "pinky finger", or 5th metacarpal
Extensor digitorum One of the key muscles on the backside of the forearm. It helps in the movements of the wrists & elbows. Provides extension for fingers 2-5 & the hand & wrist. Originates from the lateral epicondyle; subdivides down into 4 tendons
Rectus abdominis Paired straplike muscles that are the most superficial muscles of the abdomen; run from the pubis to rib cage, enclosed in an aponeurosis; main function is to flex the vertebral column; compress the abdominal contents during defecation & childbirth
External oblique Paired superficial muscles that make up the lateral walls of the abdomen. Their fibers run downward & medially from the last 8 ribs & insert into ilium. They flex the vertebral column, but also rotate the trunk & bend it laterally
Internal oblique Paired muscles that are deep to the external obliques; fibers run at right angles to those of the external obliques. They arise from the iliac crest & insert into the last 3 ribs. They flex the vertebral column, but also rotate the trunk & bend laterally
Transversus abdominis Deepest muscle of the abdominal wall & has fibers that run horizontally across the abdomen. It arises from the lower ribs & iliac crest & inserts into the pubis. This muscle compresses the abdominal contents
Gluteus medius Runs from the ilium to the femur, beneath the gluteus maximus for most of its length. It is important in steadying the pelvis during walking. It is a popular injection site for medications
Gluteus maximus Superficial muscle of the hip that forms most of the flesh of the buttock. It is the most important muscle for extending the hip when power is needed, as when climbing & jumping
Created by: kajones97
 

 



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