KAAP Lab Unit 3 Upper Extremities Muscles (Innervation, Action,Insertion & Origin )
Insertion / Origin / Action / Innervation |
Insertion: Deltoid tuberosity of humerus |
Origin: Lateral third of clavicle, acromion, and spine of scapula |
Action: Abduction, flexion, extension, and rotation of shoulder |
Innervation: Axillary nerve (C5-C6) |
Insertion: Greater tubercle of humerus |
Origin: Supraspinous fossa of scapula |
Action: Initiates abduction of arm |
Innervation: Suprascapular nerve (C5-C6) |
Insertion: Greater tubercle of humerus |
Origin: Infraspinous fossa of scapula |
Action: External (lateral) rotation of arm |
Innervation: Suprascapular nerve (C5-C6) |
Insertion: Greater tubercle of humerus |
Origin: Lateral border of scapula |
Action: External (lateral) rotation of arm |
Innervation: Axillary nerve (C5-C6) |
Insertion: Medial lip of intertubercular groove of humerus |
Origin: Inferior angle of scapula |
Action: Medial rotation and adduction of arm |
Innervation: Lower subscapular nerve (C5-C7) |
Insertion: Lesser tubercle of humerus |
Origin: Subscapular fossa of scapula |
Action: Internal (medial) rotation of arm |
Innervation: Upper and lower subscapular nerves (C5-C7) |
Insertion: Intertubercular groove of humerus |
Origin: Spinous processes of T7-L5, thoracolumbar fascia, iliac crest |
Action: Extension, adduction, and medial rotation of arm |
Innervation: Thoracodorsal nerve (C6-C8) |
Insertion: Lateral lip of intertubercular groove of humerus |
Origin: Clavicle, sternum, and costal cartilages |
Action: Flexes, adducts, and medially rotates arm |
Innervation: Medial and lateral pectoral nerves (C5-T1) |
Insertion / Origin / Action / Innervation |
Insertion: Coracoid process of scapula |
Action: Stabilizes scapula, draws it inferiorly and anteriorly |
Innervation: Medial pectoral nerve (C8-T1) |
Insertion: Medial surface of humerus |
Origin: Coracoid process of scapula |
Action: Flexion and adduction of arm |
Innervation: Musculocutaneous nerve (C5-C7) |
Insertion: Radial tuberosity and bicipital aponeurosis |
Origin: Supraglenoid tubercle of scapula |
Action: Flexes elbow, supinates forearm |
Innervation: Musculocutaneous nerve (C5-C7) |
Insertion: Radial tuberosity and bicipital aponeurosis |
Origin: Coracoid process of scapula |
Action: Flexes elbow, supinates forearm |
Innervation: Musculocutaneous nerve (C5-C7) |
Insertion: Coronoid process and ulnar tuberosity |
Origin: Distal half of anterior humerus |
Action: Primary flexor of forearm |
Innervation: Musculocutaneous nerve (C5-C6), radial nerve (C7) |
Insertion: Olecranon of ulna |
Origin: Infraglenoid tubercle of scapula |
Action: Extension of forearm and arm |
Innervation: Radial nerve (C6-C8) |
Insertion: Olecranon of ulna |
Origin: Posterior surface of humerus, superior to radial groove |
Action: Extension of forearm |
Innervation: Radial nerve (C6-C8) |
Insertion: Olecranon of ulna |
Origin: Posterior surface of humerus, inferior to radial groove |
Action: Extension of forearm |
Innervation: Radial nerve (C6-C8) |
Insertion: Lateral surface of olecranon and posterior ulna |
Origin: Lateral epicondyle of humerus |
Action: Assists in forearm extension and stabilizes elbow joint |
Innervation: Radial nerve (C7-C8) |
Insertion: Lateral surface of radius |
Origin: Medial epicondyle of humerus and coronoid process of ulna |
Action: Pronates forearm, flexes elbow |
Innervation: Median nerve (C6-C7) |
Insertion: Base of 2nd and 3rd metacarpals |
Origin: Medial epicondyle of humerus |
Action: Flexes and abducts hand at wrist |
Innervation: Median nerve (C6-C7) |
Insertion: Flexor retinaculum and palmar aponeurosis |
Origin: Medial epicondyle of humerus |
Action: Flexes hand at wrist and tenses palmar aponeurosis |
Innervation: Median nerve (C7-C8) |
Insertion: Pisiform, hook of hamate, base of 5th metacarpal |
Origin: Medial epicondyle of humerus, olecranon and ulna |
Action: Flexes and adducts hand at wrist |
Innervation: Ulnar nerve (C7-C8) |
Insertion: Middle phalanges of medial four digits |
Origin: Medial epicondyle of humerus and radius |
Action: Flexes PIP joints of fingers |
Innervation: Median nerve (C7-T1) |
Insertion: Distal phalanges of medial four digits |
Origin: Proximal ulna and interosseous membrane |
Action: Flexes DIP joints of fingers |
Innervation: Median nerve (lateral half), ulnar nerve (medial half) |
Insertion: Distal phalanx of thumb |
Origin: Anterior surface of radius and interosseous membrane |
Action: Flexes thumb at IP joint |
Innervation: Anterior interosseous nerve (C8-T1) |
Function / Location |
Function: Stabilizes shoulder joint |
Location: Surrounds the shoulder joint, connecting humerus and scapula |
Function: Deepens the glenoid cavity to stabilize the shoulder joint |
Location: Fibrocartilage rim around the glenoid cavity of scapula |
Function: Stabilizes acromioclavicular joint |
Location: Between acromion and clavicle |
Function: Stabilizes the clavicle to the scapula |
Location: Extends from coracoid process to clavicle |
Function: Provides lateral stability to elbow |
Location: Connects lateral epicondyle of humerus to radius |
Function: Provides medial stability to elbow |
Location: Connects medial epicondyle of humerus to ulna |
Function: Stabilizes proximal radius during pronation/supination |
Location: Encircles the head of the radius, holding it against the ulna |