Anatomy Test 1 Muscles Flashcards
Origin of Pectorals Major
Clavicle, sternum, 1-6 costal cartilages
Insertion of Pectorals Major
Lateral lip of the bicipital groove of the humerus
Action of Pectorals Major
Adducts and medially rotates humerus
Innervation of Pectorals Major
Medial Pectoral nerve(C8-T1), lateral pectoral nerve (C5-C7),
Blood supply of Pectorals Major
Pectoral branch of Thoracoacromial Trunk
Origin of Pectoralis Minor
3-5th ribs near costal cartilage
Insertion of Pectoralis Minor
Coracoid process of scapula
Action of Pectoralis Minor
Stabilizes and protracts scapula
Innervation of Pectoralis Minor
Medial Pectoral nerve(C8-T1)
Blood supply of Pectoralis Minor
Pectoral branch of Thoracoacromial Trunk
Origin of Subclavius
First costal cartilage
Insertion of Subclavius
Inferior surface of clavicle
Action of Subclavius
Depresses and steadies clavicle
Innervation of Subclavius
Nerve to subclavius of superior trunk of Brachial Plexus (C5-C6)
Blood supply of Subclavius
Clavicular branch of Thoracoacromial Trunk
Origin of Serrates Anterior
1-8th Ribs
Insertion of Serrates Anterior
Medial Border, inferior angle of Scapula
Action of Serrates Anterior
Protracts and Rotates Scapula
Innervation of Serrates Anterior
Long Thoracic nerve(C5-C7)
Blood supply of Serrates Anterior
Lateral Thoracic Artery and Thoracodorsal Artery
Deltopectoral Triangle boundaries:
Pectoralis major muscle, Deltoid Muscle, Clavicle
Deltopectoral Triangle contains
Cephalic Vein, Deltoid Branch of Thoracoacromial Trunk
Origin of Trapezius
External occipital protuberance, nuchal ligament, Medial superior nuchal line, Spinous processes of C7-T12
Insertion of Trapezius
Posterior border of lateral third of clavicle, acromion process, spine of scapula
Action of Trapezius
Rotation, retraction, elevation and depression of scapula
Innervation of Trapezius
Spinal accessory nerve (XI)
Blood supply of Trapezius
Transverse Cervical Artery (Descending)
Origin of Levator Scapulae
Posterior tubercle of transverse processes of (C1-C4)
Insertion of Levator Scapulae
Superior angle of scapula
Action of Levator Scapulae
Elevates scapula
Innervation of Levator Scapulae
Cervical Nerve (C3-C4), Dorsal Scapular Nerve (C5)
Blood supply of Levator Scapulae
Dorsal Scapular Artery
Origin of Rhomboid Minor
Nuchal ligaments and spinous processes (C7-T1)
Insertion of Rhomboid Minor
Medial border of scapula and (Superior to insertion of Rhomboid Major)
Action of Rhomboid Minor
Retracts and Rotates Scapula and Fixes scapula to thoracic wall
Innervation of Rhomboid Minor
Dorsal Scapular Nerve (C4-C5)
Blood supply of Rhomboid Minor
Deep branch of Transverse Scapular Artery
Origin of Rhomboid Major
Spinous processes of T2-T5
Insertion of Rhomboid Major
Medial border of Scapula (Inferior to insertion of Rhomboid Minor)
Action of Rhomboid Major
Retracts and Rotates Scapula, Fixes Scapula to Thoracic Wall
Innervation of Rhomboid Major
Dorsal Scapular Nerve (C4-C5)
Origin of Latissimus Dorsi
Spinous process of T7-L5, Thoracolumbar fascia, Iliac Crest, inferior angle of Scapula, inferior 3-4 ribs
Insertion of Latissimus Dorsi
Medial lip of Bicipital groove of Humerus
Action of Latissimus Dorsi
Adducts, extends, and internally rotates Humerus
Innervation of Latissimus Dorsi
Thoracodosal nerve (C6-C8)
Blood supply of Latissimus Dorsi
Thoracodorsal Branch of Subscapular Artery
Origin of Deltoids
Anterior border and upper surface of Lateral third of Clavicle, Acromion, Spine of Scapula
Insertion of Deltoids
Deltoid Tuberosity of Humerus
Action of Deltoids
Shoulder Abduction, flexion, and extension
Innervation of Deltoids
Axillary Nerve (C5-C6)
Blood supply of Deltoids
Deltoid branch of Thoracoacromial Trunk, Posterior Circumflex humeral Artery
Origin of Supraspinatus
Supraspinous fossa of Scapula
Insertion of Supraspinatus
Greater tubercle of Humerus
Action of Supraspinatus
Abduction of arm (15-20 degrees) and stabilizes humerus
Innervation of Supraspinatus
Suprascapular Nerve (C4-C5)
Blood suppy of Supraspinatus
Suprascapular Artery
Origin of Infraspinatus
Infraspinous fossa of Scapula
Insertion of Infraspinatus
Greater tubercle of Humerus
Action of Infraspinatus
Lateral rotation of Humerus
Innervation of Infraspinatus
Suprascapular Nerve (C4-C5)
Blood supply of Infraspinatus
Suprascapular and Circumflex Scapular Arteries
Origin of Teres Major
Posterior aspect of the inferior angle of Scapula
Insertion of Teres Major
Medial lip of intertubercular groove of Humerus
Action of Teres Major
Medial rotation of Humerus
Innervation of Teres Major
Lower Subscapular Nerve (C5-C6)
Blood supply of Teres Major
Subscapular and Circumflex Scapular Arteries
Origin of Teres Minor
Lateral border of Scapula
Insertion of Teres Minor
Greater tubercle of Humerus
Action of Teres Minor
Laterally rotates Humerus
Innervation of Teres Minor
Axillary Nerve (C5-C6)
Blood supply of Teres Minor
Posterior circumflex humeral and circumflex scapular arteries
Origin of Subscapularis
Subscapular Fossa
Insertion of Subscapularis
Lesser tubercle of Humerus
Action of Subscapularis
Medially Rotates Humerus
Innervation of Subscapularis
Upper subscapular Nerve, Lower Subscapular Nerve (C5-C6)
Blood supply of Subscapularis
Subscapular Artery
Quadrangular Space boundaries:
Teres Minor
Teres Major
Long Head of Triceps
Lateral Head of Triceps
Quadrangular Space contains:
Axillary Nerve
Posterior Circumflex Humeral Artery
Triangular Space boundaries:
Teres Minor
Teres Major
Long Head of Triceps
Triangular Space contains:
Circumflex scapular artery deep to space
Triangular Interval boundaries:
Teres Major
Long Head of Triceps
Lateral Head of Triceps
Triangular Interval contains:
Radial Nerve
Deep Brachial Artery
Triangle of Auscultation boundaries:
Trapezius
Latissiumus Dorsi
Medial Border of Scapula
Lumbar Triangle of Petit boundaries:
Iliac Crest External Oblique Latissiumus Dorsi Site of Hernia (Cecum and Internal Oblique)
Origin of Biceps Brachii – Short Head
Coracoid process of Scapula
Insertion of Biceps Brachii – Short Head
Radial tuberosity
Action of Biceps Brachii – Short Head
Flexes elbow and Supinates forearm
Innervation of Biceps Brachii – Short Head
Musculocutaneous Nerve (C5-C7)
Blood supply of Biceps Brachii – Short Head
Brachial Artery
Origin of Biceps Brachii – Long Head
Supraglenoid Tubercle
Insertion of Biceps Brachii – Long Head
Radial tuberosity
Action of Biceps Brachii – Long Head
Flexes elbow and Supinates forearm
Innervation of Biceps Brachii – Long Head
Musculocutaneous Nerve (C5-C7)
Blood supply of Biceps Brachii – Long Head
Brachial Artery
Origin of Coracobrachialis
Coracoid process of Scapula
Insertion of Coracobrachialis
Medial Humerus
Action of Coracobrachialis
Adducts Humerus, Flexes arm at Glenohumeral joint
Innervation of Coracobrachialis
Musculocutaneous Nerve (C5-C7)
Blood supply of Coracobrachialis
Brachial Artery
Origin of Brachialis
Anterior surface of Humerus (distal half)
Insertion of Brachialis
Coronoid process and tuberosity of ulna
Action of Brachialis
Flexes elbow
Innervation of Brachialis
Musculocutaneous Nerve (C5-C7)
Blood supply of Brachialis
Radial Recurrent Artery
Origin of Triceps Brachii
Long head – infraglenoid tubercle of scapula
Lateral head – above radial sulcus
Medial head – below radial sulcus
Insertion of Triceps Brachii
Olecranon process of ulna
Action of Triceps Brachii
Extends forearm, long head extends shoulder
Innervation of Triceps Brachii
Radial Nerve (C5-T1)
Blood supply of Triceps Brachii
Deep Brachial Artery
Origin of Ancones
Lateral epicondyle of Humerus
Insertion of Ancones
Lateral surface of olecranon process, Superior ulna
Action of Ancones
Forearm extension, Stabilization during pronation/supination
Innervation of Ancones
Radial Nerve (C5-T1)
Blood supply of Ancones
Deep Brachial Artery, Recurrent Interosseous Artery
Cubital Fossa bound by
Laterally by brachioradialis muscle
Medially by pronator teres muscle
Cubital Fossa base:
Between the epicondyles
Cubital Fossa floor:
Supinator muscle laterally
Brachialis muscle medially
Cubital Fossa roof:
Skin and fascia
Bicipital aponeurosis
Cubital Fossa contains:
Median Nerve Brachial Artery – radial and ulnar arteries Tendon of Biceps Brachii Radial Nerve and Deep Branches Lateral Cutaneous nerve of forearm Median Cubital vein
Origin of Extensor Carpi Radialis Longus
Lateral Supracondylar Ridge
Insertion of Extensor Carpi Radialis Longus
2nd metacarpal
Action of Extensor Carpi Radialis Longus
Extension of wrist
Abducts hand at the wrist
Innervation of Extensor Carpi Radialis Longus
Radial Nerve (C5-T1)
Blood supply of Extensor Carpi Radialis Longus
Radial artery
Origin of Extensor Carpi Radialis Brevis
Anterior lateral epicondyle of Humerus
Insertion of Extensor Carpi Radialis Brevis
Posterior base of 3rd metacarpal
Action of Extensor Carpi Radialis Brevis
Extensor and abductor of the hand at the wrist
Innervation of Extensor Carpi Radialis Brevis
Deep branch of Radial Nerve (C5-T1)
Blood supply of Extensor Carpi Radialis Brevis
Radial Artery
Origin of Pronator Teres
Medial epicondyle of Humerus
Insertion of Pronator Teres
Middle of the lateral surface of the body of the Radius
Action of Pronator Teres
Pronation of forearm
Flexes elbow
Innervation of Pronator Teres
Median Nerve (C6-T1)
Blood supply of Pronator Teres
Radial and Ulnar Arteries
Origin of Flexor Carpi Radialis
Medial epicondyle of Humerus
Insertion of Flexor Carpi Radialis
Bases of second and third metacarpals
Action of Flexor Carpi Radialis
Flexion and abduction of wrist
Innervation of Flexor Carpi Radialis
Median Nerve (C6-T1)
Blood supply of Flexor Carpi Radialis
Ulnar Arteries
Origin of Palmer’s Longus
Medial epicondyle of Humerus
Insertion of Palmer’s Longus
Palmar aponeurosis
Action of Palmer’s Longus
Flexion of the wrist
Innervation of Palmer’s Longus
Median Nerve (C6-T1)
Blood supply of Palmer’s Longus
Ulnar Artery
Origin of Flexor Carpi Ulnaris
Medial epicondyle of Humerus
Insertion of Flexor Carpi Ulnaris
Pisiform
Action of Flexor Carpi Ulnaris
Flexion of wrist
Adduction of wrist
Innervation of Flexor Carpi Ulnaris
Muscular Branches of Ulnar Nerve
Blood supply of Flexor Carpi Ulnaris
Ulnar Artery
Origin of Flexor Digitorum Superficialis
Medial epicondyle of Humerus
Insertion of Flexor Digitorum Superficialis
Anterior margins on the bases of middle phalanges of the four fingers
Action of Flexor Digitorum Superficialis
Flexes fingers
Innervation of Flexor Digitorum Superficialis
Median Nerve (C6-T1)
Blood supply of Flexor Digitorum Superficialis
Ulnar Artery
Origin of Supinator
Lateral epicondyle of Humerus
Supinator Crest of Ulna
Insertion of Supinator
Lateral proximal radial shaft
Action of Supinator
Supinates forearm
Innervation of Supinator
Deep Radial Nerve
Blood supply of Supinator
Radial Recurrent Artery
Origin of Flexor Policus Longus
The middle ½ of volar surface of Radius
Adjacent interosseous membrane
Insertion of Flexor Policus Longus
Base of distal phalanx of the thumb
Action of Flexor Policus Longus
Flexion of the thumb
Innervation of Flexor Policus Longus
Anterior interosseous nerve – branch of Median Nerve (C6-T1)
Blood supply of Flexor Policus Longus
Anterior Interosseous artery
Origin of Pronator Quadratus
Medial, anterior surface of ulna
Insertion of Pronator Quadratus
Lateral, anterior surface of Radius
Action of Pronator Quadratus
Pronates forearm
Innervation of Pronator Quadratus
Anterior interosseous nerve – branch of Median Nerve (C6-T1)
Blood supply of Pronator Quadratus
Anterior Interosseous artery
Origin of Flexor Digitorum Profundus
Upper ¾ of the voler and medial surfaces of Ulna
Interosseous membrane
Insertion of Flexor Digitorum Profundus
Base of distal phalanges of fingers
Action of Flexor Digitorum Profundus
Flexion of the hand
Innervation of Flexor Digitorum Profundus
Anterior interosseous nerve – branch of Median Nerve (C6-T1)
Blood supply of Flexor Digitorum Profundus
Anterior Interosseous artery
Origin of Extensor Carpi Ulnaris
Common Extensor Tendon
Insertion of Extensor Carpi Ulnaris
5th Metacarpal
Action of Extensor Carpi Ulnaris
Extends and Adducts Wrist
Innervation of Extensor Carpi Ulnaris
Deep Branch of Radial Nerve (C5-T1)
Blood supply of Extensor Carpi Ulnaris
Ulnar Artery
Origin of Extensor Digitorum
Lateral epicondyle of Humerus
Insertion of Extensor Digitorum
Extensor expansion of middle/distal phalanges of 2nd-5th fingers
Action of Extensor Digitorum
Extension of hand, wrist, fingers
Innervation of Extensor Digitorum
Radial Nerve (C5-T1)
Blood supply of Extensor Digitorum
Posterior Interosseous artery
Origin of Extensor Digiti Minimi
Anterior portion of the lateral epicondyle of the Humerus
Insertion of Extensor Digiti Minimi
Base of proximal phalanx of finger 5
Action of Extensor Digiti Minimi
Extends wrist and the little finger
Innervation of Extensor Digiti Minimi
Posterior Interosseous Nerve (C7-8)
Blood supply of Extensor Digiti Minimi
Posterior Interosseous artery
Origin of Abductor Pollicis Longus
Ulna, Radius, Interosseous Membrane
Insertion of Abductor Pollicis Longus
First Metacarpal
Action of Abductor Pollicis Longus
Abduction, extension of the thumb
Innervation of Abductor Pollicis Longus
Posterior Interosseous Nerve
Blood supply of Abductor Pollicis Longus
Posterior Interosseous artery
Origin of Extensor Pollicus Brevis
Radius and Interosseous Membrane
Insertion of Extensor Pollicus Brevis
Thumb, proximal phalanx
Action of Extensor Pollicus Brevis
Extension of thumb
Innervation of Extensor Pollicus Brevis
Posterior interosseous nerve – branch of Median Nerve (C6-T1)
Blood supply of Extensor Pollicus Brevis
Posterior Interosseous artery
Origin of Extensor Indicis
Ulna, interosseous membrane
Insertion of Extensor Indicis
Index finger
Action of Extensor Indicis
Extends index finger, wrist
Innervation of Extensor Indicis
Posterior interosseous nerve – branch of Median Nerve (C6-T1)
Blood supply of Extensor Indicis
Posterior Interosseous artery
Blood supply of Rhomboid Major
Dorsal Scapular Artery