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