abducting muscle groups
TRANSCRIPT
Abducting Muscle Groups Muscles which Produce Scapular Abduction (Protraction)
1. Serratus Anterior
Tendons
Origin : Outer surface of upper 8 or 9 ribs
Insertion : Costal surface of vertebral border of the Scapula
Function : Abducts scapula at the Scapulothoracic Joint; raises ribs when scapula is fixed
Nerve : Long Thoracic Nerve
Artery : Lateral thoracic artery
2. Pectoralis Major
Tendons
Origin : Sternal half of the Clavicle, sternum to 7th rib, cartilages of true ribs, aponeurosis of external oblique
Insertion : Lateral lip of bicipital groove of the Humerus
Function : Adducts arm, extends arm, internal rotation of the shoulder along with other
Muscles which produce shoulder Adduction
Muscles which produce shoulder Extension
Muscles which produce shoulder Internal (medial) Rotation
Nerve : dual innervation by the Medial Pectoral Nerve and the Lateral Pectoral Nerve
Artery : Pectoral branch of Thoracoacromial artery and the Internal Mammary artery
3. Pectoralis Minor
Tendons
Origin : Outer suface and upper margin of 3rd 4th and 5th ribs
Insertion : Coracoid process of the Scapula
Function : Lowers angle of scapula, pulls shoulder forward at the Scapulothoracic Joint
Nerve : Medial Pectoral Nerve
Artery : Pectoral branch of Thoracoacromial artery and the Lateral thoracic artery
Muscles which Produce Upward Rotation of Scapula1. Trapezius (middle part)
Tendons
Origin : External occipital protuberance, superior nuchal line of skull Nuchal ligament from spines of seventh cervical and all thoracic verebrae
Insertion : Lateral third of the Clavicle, acromion and spine of the Scapula
Function : Adducts scapula, tilts chin, draws back acromion, rotates scapula at the Scapulothoracic Joint
Nerve : Spinal Accessory Nerve
Artery : Descending scapular artery
2. Serratus Anterior
Muscles which Produce Shoulder Abduction1. Deltoid
Tendons
Origin : Lateral third of the Clavicle, the upper surface of the acromion, and the spine of the Scapula
Insertion : Deltoid tuberosity of the Humerus
Function : Abducts the shoulder along with other Muscles which produce shoulder Abduction
Nerve : Circumflex anterior and posterior brances of the Axillary Nerve
Artery :
Posterior humeral circumflex artery
Deltoid branch of Thoracoacromial artery
2. Supraspinatus
Tendons
Origin : Supraspinous fossa of the Scapula
Insertion : Superior facet of greater tuberosity of the Humerus and the Glenohumeral Joint
Function : Assists the deltoid in abducting the arm, fixes the head of the humerus in the glenoid fossa, and external rotation of the shoulder along with other Muscles
which produce shoulder Abduction and Muscles which produce shoulder External (lateral) Rotation
Nerve : Suprascapular Nerve
Artery : Suprascapular (transverse cervical) artery
Muscles which Produce Wrist Radial Deviation1. Abductor Pollicis Longus
Tendons
Origin : Posterior surface of the Ulna, the radioulnar interosseous membrane and the middle third of posterior surface of the Radius
Insertion : Radial dorsal base of the Thumb Metacarpal, Variably the dorsal Trapezium and the radial surface of the Abductor pollicis longus muscle
Function : Abducts the thumb basal joint, along with other muscles which radially abduct the thumb. Also radially deviates the wrist along with other mucles which produce wrist radial abduction
Nerve : Posterior Interosseous Nerve
Artery : Posterior Interosseous artery
2. Flexor Carpi Radialis
Tendons
Origin : common forearm flexor origin from the medial epicondyle of the Humerus and the deep forearm fascia
Insertion : Volar base of the Index Metacarpal and the Middle Metacarpal
Function : flexion and radial deviation of the wrist, along with other muscles which flex the wrist and radially deviate the wrist, weak pronation of the forearm along with other muscles which pronate the forearm and weak flexion of the elbow along with other muscles which flex the elbow
Nerve : Median Nerve
Artery : Muscular Branches of Radial Artery
3. Extensor Carpi Radialis Longus
Tendons
Origin : Lower 1/3 of lateral supracondylar ridge of the Distal humerus and the lateral intermuscular septum
Insertion : Dorsal base of the Index Metacarpal
Function : Extends, radially deviates the Wrist
Nerve : Radial
Artery : Muscular Branches of Radial Artery and the Radial Recurrent artery
4. Extensor Carpi Radialis Brevis
Tendons
Origin : Common extensor tendon of the lateral epicondyle the radial collateral ligament of the elbow and the deep forearm fascia
Insertion : Dorsal base of the Middle Metacarpal
Function : Extends and radially deviates the Wrist. Weak elbow flexor.
Nerve : Posterior Interosseous Nerve
Artery :
Muscular Branches of Radial Artery
Radial Recurrent artery
Muscles which Radial Abduct the Basal Joint1. Abductor Pollicis Longus
Tendons
Origin : Posterior surface of the Ulna, the radioulnar interosseous membrane and the middle third of posterior surface of the Radius
Insertion : Radial dorsal base of the Thumb Metacarpal, Variably the dorsal Trapezium and the radial surface of the Abductor pollicis longus muscle
Function : Abducts the thumb basal joint, along with other muscles which radially abduct the thumb. Also radially deviates the wrist along with other mucles which produce wrist radial abduction
Nerve : Posterior Interosseous Nerve
Artery : Posterior Interosseous artery
2. Extensor Pollicis Brevis
Tendons
Origin : Posterior surface of the Radius and the radioulnar interosseous membrane
Insertion : Dorsal base of the thumb proximal phalanx
Function : Extends the thumb MCP joint and weakly abducts the thumb basal joint, along with other muscles which produce radial and palmar abduction
Nerve : Posterior interosseous
Artery : Posterior interosseous
3. Opponens Pollicis
Tendons
Origin : transverse carpal ligament and the Trapezium
Insertion : Volar radial aspect of the Thumb Metacarpal
Function : flexes and pronates the basal joint along with other muscles which produce thumb opposition
Nerve : Motor Branch of the Median Nerve
Artery : Superficial Volar Branch of Radial artery