LCCW Regional Anatomy 1 Lecture
Supraspinatus Action
Abduction of humerus
Pectoralis Major action
Addiction and medial rotation of humerus, flexion of humerus
Serratus Anterior Insertion
Anterior portion of medial border of scapula
Deltoid Nerve
Axillary nerve (C5-6)
Teres Minor Nerve
Axillary nerve (C5-6)
pectoralis major insertion
Clavicular head: anterior surface medial 1/3 of clavicle Sternocostal head : anteriolateral sternum and upper 6 ribs
Pectoralis minor insertion
Coracoid process of scapula
brachialis insertion
Coronoid process and tuberosity of ulna
Subclavius Origin
Costal junction rib 1
Deltoid Insertion
Deltoid tuberosity of humerus (lateral)
Brachialis Origin
Distal ½ anterior surface of the humerus
Levator Scapula Nerve
Dorsal scapular (C-5) (may include C3-4)
Rhomboid Major Nerve
Dorsal scapular (C-5) (may include C4)
Rhomboid Minor Nerve
Dorsal scapular nerve (C-5) (may include C-4)
Teres Major Origin
Dorsal surface of inferior angle of scapula
Levator Scapula Actions
Elevate scapula (may assist with lateral flexion of the cervical vertebrae if scapula is stationary)
Trapezius Action
Elevate, retract, depress, superior rotation of scapula
Triceps Brachii Action
Extension of forearm (long head assists with abduction and extension of humerus)
Anconeus Action
Extension of the forearm
Latissimus Dorsi Action
Extension, medial rotation, adduction of humerus
Serratus Anterior Origin
External surfaces of lateral parts of 1st-8th ribs
Biceps Brachii Action
Flexes and supinates forearm (may assist with flexion of the humerus)
Palmaris Longus Action
Flexes wrist
Flexor carpi radialis action
Flexes wrist and abducts wrist (radial deviation)
Corocobrachialis Action
Flexion and addiction of the humerus
Brachialis Action
Flexion of forearm
Brachioradialis action
Flexion of forearm (may assist in supination)
What muscle(s) make up the 2nd "layer" of anterior forearm muscles?
Flexor digitorum superficialis
What muscle(s) make up the 3rd "layer" of anterior forearm muscles?
Flexor pollcis longus, flexor digitorum profundus
Palmaris Longus Insertion
Flexor retinaculum and palmar aponeurosis
Teres Minor Insertion
Inferior facet of greater tubercle of humerus
Infraspinatus Origin
Infraspinous fossa of scapula
Anconeus Origin
Lateral epicondyle of humerus
Triceps Brachii lateral head origin
Lateral head: Posterior humerus ( yellow)
Pectoralis Major nerve
Lateral pectoral nerve (C5-7) to clavicular head Medial pectoral nerve (C8-T1) to sternocostal head
Brachioradialis Origin
Lateral portion of distal humerus (supracondylar ridge)
Teres Minor Action
Lateral rotation of humeres
Infraspinatus Action
Lateral rotation of humerus
Subscapularis Insetion
Lesser tubercle of humerus
Triceps Brachii long head origin
Long head: Infraglenoid tubercle (red)
3 origins of triceps Brachii
Long head: Infraglenoid tubercle, Lateral head: Posterior humerus, Medial head: posterior humerus
Serratus Anterior Innervation
Long thoracic nerve (C5-7)
Teres Major Innervation
Lower subscapular nerve (C6, C7)
Trapezius Origin
Medial 1/3 superior nuchal line, EOP, nuchal ligament, SP C7-T12
Rhomboid Major Insertion
Medial border of scapula (Below rhomboid minor to inferior angle)
Rhomboid Minor Insertion
Medial border of scapula level of spine of the scapula (inferior to insertion of levator scapula)
Palmaris Longus Origin
Medial epicondyle of humerus
Biceps Brachii medial head origin
Medial head: posterior humerus
pectoralis minor innervation
Medial pectoral nerve (C8, T1)
Subscapularis Action
Medial rotation of humerus (assists with adduction)
Corocobrachialis
Medial surface of humerus
Palmaris Longus Innervation
Median Nerve (C7-8)
Pronator teres innervation
Median nerve (C6, C7)
Flexor carpi radialis inervation
Median nerve (C6-7)
Subclavius Insertion
Middle and distal portion of the clavicle (lateral 2/3)
Infraspinatus Insertion
Middle facet on greater tubercle of humerus
Teres Minor Origin
Middle portion of lateral border of scapula
Brachialis innervation
Musculocutaneous nerve (C5, C6)
Biceps Brachii innervation
Musculocutaneous nerve (C5-6)
Subclavius Innervation
Nerve to subclavius (C5-6)
Anconeus Insertion
Olecranon and superior part of posterior surface of ulna
Pronator teres action
Pronation and flexion of the forearm
What muscle(s) make up the 4th "layer" of anterior forearm muscles?
Pronator quadratus
What muscle(s) make up the 1st "layer" of anterior forearm muscles?
Pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris
Pectoralis minor action
Protraction and depression of the scapula
serratus anterior action
Protraction of scapula, stabilizes scapula against thoracic wall
Brachioradialis innervation
Radial nerve (C5, C6, C7)
Triceps Brachii Innervation
Radial nerve (C6, C7, C8)
Anconeus Innervation
Radial nerve (C7, C8, T1)
Biceps Brachii Insertion
Radial tuberosity and bicipital aponeurosis
Rhomboid Minor Action
Retract scapula rotate glenoid cavity inferior
Rhomboid Major Action
Retract scapula, rotate glenoid cavity inferior
Rhomboid Minor Origin
SP C7-T1
Rhomboid Major Origin
SP T2-T5
Latissimus Dorsi Origin
SP of T7-L5, thoracolumbar fascia, iliac crests
Biceps Brachii Origin
Short head: coracoid process, Long head: supraglenoid tubercle of scapula
Trapezius Innervation
Spinal accessory nerve (CN XI)
Trapezius Insertion
Spine of the scapula, acromion process, lateral 1/3 of clavicle
Deltoid Origin
Spine of the scapula, acromion process, lateral 1/3 of the clavicle
Brachioradialis insertion
Styloid process and distal 1/3 of the radius
Subscapularis Origin
Subscapular fossa
Supraspinatus Insertion
Superior facet of greater tubercle of humerus
Levator Scapula Insertion
Superior portion of medial border of scapula
Supraspinatus Nerve
Suprascapular nerve (C5-6) (may include C4)
Infraspinatus Nerve
Suprascapular nerve (C5-C6)
Rotator Cuff Muscles
Supraspinatus, Infraspinatus, Teres minor, Subscapularis
Supraspinatus Origin
Supraspinous fossa of scapula
Levator Scapula Origin
TP C1-4
Latissimus Dorsi Nerve
Thoracodorsal nerve (C6-C8)
Subscapularis Nerve
Upper and lower subscapular nerve (C5-7)
Teres Major Action
adducts and medially rotates arm (assists latissimus dorsi in extension of humerus)
Pectoralis Minor Origin
anterior surface of ribs 3-5, near their costal cartilages
Flexor carpi radialis insertion
base of 2nd metacarpal
corocobrachialis origin
coracoid process
Deltoid Action
extension, abduction, flexion of humerus
pectoralis major insertion
intertubercular groove of humerus (lateral portion )
Teres Major Insertion
intertubercular groove of humerus (medial portion)
Latissimus Dorsi Insertion
intertubercular groove of the humerus (medial portion)
Pronator teres insertion
lateral surface of radius
Flexor carpi radialis origin
medial epicondyle of humerus
Pronator teres origin
medial epicondyle of humerus and coronoid process of ulna
Corocobrachialis Innervation
musculocutaneous nerve(C5-6)
Triceps Brachii Insertion
olecranon process of ulna
Subclavius Action
stabilizes and depresses clavicle
