Case Study: Structure Origin Insertion Action

Table 1.
Structure Origin Insertion Action
Deltoideus, pars clavicularis Lateral third of clavicle Deltoid tuberosity of the lateral side of the body of the humerus Flexion and medial (internal) rotation of humerus
Deltoideus, pars acromialis Acromion Deltoid tuberosity of the lateral side of the body of the humerus Abduction of humerus
Deltoideus, pars spinalis Scapula spine Deltoid tuberosity of the lateral side of the body of the humerus Extension and lateral rotation of humerus
Supraspinatus All of the supraspinatus fossa The greater tubercle of the humerus Assists deltoid in abducting the arm
Infraspinatus Infraspinatus fossa on posterior surface of the scapula Greater tubercle of the humerus Laterally rotates the upper limb; stabilizes …show more content…
Triceps brachii, caput longum Infraglenoid tuberosity Olecranon of the ulna Extension of the elbow; adduction of the shoulder
Triceps brachii, caput mediale Posterior surface of the body of the humerus, below the groove of the radial nerve Olecranon of the ulna Extends the forearm at the elbow
Brachialis Anterior distal half of the humerus Ulnar tuberosity and anterior surface of the coronoid process Flexes the forearm at the elbow
Pronator teres Medial epicondyle of humerus, coronoid process of ulna Lateral surface of radius Pronates and flexes forearm
Brachioradialis Ridge superior to lateral epicondyle of the humerus and the lateral intermuscular septum Lateral side of the base of the styloid process of the radius Flexes at the forearm
Flexor carpi radialis Medial epicondyle of the humerus Base of the 2nd metacarpal and base of 3rd metacarpal Flexion and abduction (radial) of the hand
Flexor pollicis longus Anterior surface of radius and interosseous membrane Base of distal phalanx of thumb (pollex) Flexes distal phalanx of the thumb (pollex)
Flexor digitorum superficialis Humeral head: medial epicondyle; ulnar head: coronoid process: radial head: below the radial tuberosity Middle phalanx of digits 2-5 Flexes wrist, flexes middle and proximal phalanges of digits …show more content…
Extensor pollicis longus Lateral part of the middle third of the dorsal (posterior) surface of the body of the ulna and from the interosseous membrane Base of the phalanx of the thumb Extension of the thumb, adduction of wrist
Extensor digitorum Lateral epicondyle of the humerus, by the common tendon Dorsal digital expansions of digits 2-4 Extension of the wrist; extension and abduction of digits 2-5
Abductor pollicis longus Lateral dorsal surfaces of the radius and ulna as well as the interosseous membrane Radial (lateral) side of the base of the first metacarpal bone Abduction at wrist and thumb
Extensor pollicis brevis Dorsal surface of the body of the radius and interosseous membrane distal to origin of the adductor pollicis longus Base of the first phalanx of the thumb Extension of the thumb, abduction of the wrist
Supinator Lateral epicondyle of the humerus, ulna, radial collateral ligaments, and annular ligaments Dorsal and lateral surfaces of the body of the radius Supinates the hand and forearm by rotating the radius around the ulna
Flexor digitorum profundus Proximal three-fourths of the anterior and medial surfaces of the ulna and interosseous membrane Base of the palmar surface of the distal phalanges 2-5 Flexes wrist; flexes distal phalanx for digits