anatomy quiz 2 (weeks 6-8)

what bony landmark of 3 of 4 rotator cuff muscles insert into?

greater tubercle (supraspinatus, infraspinatus, trees minor)

supraspinatus innervation

suprascapular nerve

infraspinatus innervation

suprascapular nerve

teres minor innervation

axillary nerve

Subscapularis innervation

upper and lower subscapular nerves

rotator cuff muscles

supraspinatus, infraspinatus, teres minor, subscapularis

a pt has difficulty with initiation of shoulder abduction, what muscle is affected?

supraspinatous (first 15 degrees of abd)

prime mover of abduction of shoulder

deltoid

infrapisnatous action

ER

lat dorsi action

GH add, IR, ext (pull ups)

teres minor action

ER

subscap action

IR

rotator cuff action

glenohumeral stabilization

pt with shoulder pain, pt's prominent medial border of scapula (scapula winging), which nerve is injured?

long thoracic nerve

serratus anterior innervation

long thoracic nerve

lats dorsi innervation

thoracodorsal nerve

trapezius innervation

accessory nerve

pec minor and major innervation

medial and lateral pectoral nerve

Subclavius innervation

nerve to subclavius

abduction of shoulder

170-180 degrees; about 60 degrees from sternoclavicular; 120 degrees at glenohumeral joint

upper trap action

scapular elevation

middle trap action

retracts scapula

lower trap action

Scapular depression

levator scap action

Scapular elevation and downward rotation

levator scap innervation

dorsal scapular nerve

rhomboid minor and major action

retracts scapula

rhomboid major and minor innervation

dorsal scapular nerve

pec major action

adduction and medial rotation of humerus; horizontal add/flex

pec minor action

stabilizes scapula (attached to coracoid process); protraction

deltoid innervation

axillary nerve

deltoid attachment

distally to deltoid tuberosity of humerus

deltoid anterior action

abduction, flexion, horizontal adduction

deltoid lateral action

abduction

deltoid posterior action

extension, ER

supraspinatus action

abduction, stabilization

infraspinatus actioon

ER, stabilization

subscapularis action

IR, stabilization

teres major innervation

lower subscapular nerve

teres major action

adduction, IR

biceps brachii innervation

musculocutaneous nerve

biceps brachii action

flexes elbow joint and supinates forearm

biceps brachii short head origin

coracoid process of scapula

bracialis innervation

musculocutaneous nerve

Coracobrachialis innervation

musculocutaneuous nerve

Coracobrachialis action

add GH joint and help flex GH joint

triceps brachii action

elbow extension

triceps brachii innervation

radial nerve

triceps brachii long head

crosses shoulder joint

anconeus muscle action

extension of elbow

anconeus innervation

radial nerve

serratus anterior attachment

medial border of scapula

serratus anterior action

stabilize against trunk, protraction

subclavius action

stabilizes and depresses clavicle

quadrangular space

axillary nerve and posterior circumflex humeral artery

brachial plexus

-C5-T1

-comes from ventral rami (mixed sensory and motor)

supraclavicular nerves

dorsal scapular nerve; long thoracic nerve; suprascapular nets; nerve to subclavius

anterior division of brachial plexus (M)

musculocutaneous -> median (forarm) -> ulnar (forearm); innervate anterior surface

posterior division of brachial plexus

posterior cord; radial and axillary; posterior surface of arm

medial pectoral nerve

medial cord

lateral pectoral nerve

lateral cord

throacodorsal nerve

posterior cord

general action of muscles in anterior forearm

wrist flexion and forearm pronation

what travels through carpal tunnel and can become compressed causing numbness and wakens in hand

median nerve

all muscles in posterior compartment are innervated by branches from which nerve

radial nerve

what bone can be palpated in the anatomical snuff box

scaphoid

wrist bones

what type of joint is the ulna

hinge joint (stability)

carrying angle

-between humerus and ulna

-males: 10-15 degrees

-females: > 15 degrees (wider hips)

carpometacarpal joints action

flex/ext, abd/add, circumduction

metacarpal phalangeal joint action

flex/ext; abd/add

ulnar collateral ligament action

humerus to ulna; resists valgus force

what ligament is most injured in overhead athletes

ulnar collateral ligament

annular ligament

radius to ulna; around radial head; injured in kids (nursemaids elbow)

radial collateral ligament action

resist varus force

interosseous membrane

holding ulna and radius together; transfer forces between wrist and elbow

flexor retinaculum

creates carpal tunnel (closes it in); rigid/doesn't allow much expansion

radial collateral ligament of wrist action

limits ulnar deviation

ulnar collatoral ligament of wrist action

limits radial deviation

extensor hood

lumbricals -> tendons anterior at MCP -> flex/ext of phalanges (lumbrical grip)

anterior forearm action

wrist flexion (common flexor tendon)

superficial muscles of anterior forearm (PASS, FAIL, PASS, FAIL)

-pronator teres

-flexor carpi radialis

-palmaris longus

-flexor carpi ulnaris

pronator teres action

radial/ulna pronation

pronator teres innervation

median nerve

flexor carpi radialis action

flexes carpals; radial deviation/flexion

flexor carpi radialis innervation

median nerve

palmaris longus action

goes into palmar apenerosis (helps tension it); flexes wrist

palmaris longus innervation

median nerve

flexor carpi ulnaris innervation

ulnar nerve

flexor carpi ulnaris action

flex and ulnar deviate wrist

middle of anterior forearm

flexor digitorum superficialis

flexor digitorum superficialis innervation

median nerve

flexor digitorum superficialis action

-flexes digits 2-5

-splits into two tendons: profundus tendon in between; flexion of proximal ineterphalangeal joints

anterior forearm deep muscles

-flexor digitorum profundus

-flexor pollicis longus

-pronator quadratus

flexor pollicis longus innervation

median nerve

flexor pollicis longus action

flex interphalangeal of thumb

flexor digitorum profundus innervation

median (1-3) and ulnar nerve (4 and 5)

flexor digitorum profundus action

flex distal interphalangeal joints

pronator quadratus innervation

Anterior interosseous nerve, from median nerve (C8, T1)

pronator quadratus action

pronates forearm (connects ulna to radius)

brachioradialis action

elbow flexion (neutral position)