ch 7 pt 2

exam 2 prep- hand ppt

what are the extrinsic extensor muscles

Extensor carpi radialis longus

Extensor carpi radialis brevis

Extensor carpi ulnaris

Extensor digitorum

Extensor indicis

Extensor digiti minimi

Abductor pollicis longus 

Extensor pollicis brevis

Extensor pollicis longus

extensor carpi radialis longus and brevis description and movements

extensor carpi radialis longus- wrist extension, radial deviation

extensor carpi radialis brevis - wrist flexion

both» wrist extension and radial deviation (ex: playing pickleball, painting a wall)

extensor carpi ulnaris description and movements

wrist extension and ulnar deviation

ex: hammering, playing violin

extensor digitorum description and movements

slips into 4 tendons

extends the DIP, PIP, and MCP

ex: typing, swiping up on phone

what are the extensor tendon pathways in the finger, what tendons

the complex network of tendons on the back of your hand and fingers that allows you to straighten them

Sagittal bands

Extensor hood

Central slip

Lateral bands

Terminal tendon

Oblique retinacular ligament

what is a boutonnier deformity and what causes it

pip flexion, Dip hyperextension

an injury to the central slip—the extensor tendon

what is swan neck deformity and what causes it

PIP hyperextension

DIP flexion

• terminal tendon damage

extensor indicis and extensor digiti minimi description and movements

• pointing at something, (is absent in some ppl)

what are the extensors of the thumb

abductor pollicis longus

extensor pollicis brevis

extensor pollicis longus

abductor pollicis longus description and movements

abduct and extend the thumb

does texting, picking up infant (new moms may injure)

extensor pollicis longus and brevis

longus-extends IP, MCP, CMC of thumb

brevis- extends MCP and CMC of thumb

what is the anatomical snuffbox

formed of

• Abductor pollicis longus

• Extensor pollicis longus

• Extensor pollicis brevis

what muscles are part of the intrinsic hand muscles (fast twitch)

Thenar muscles

Hypothenar muscles

Palmar interossei

Dorsal interossei

Adductor pollicis

Lumbricals

what are the thenar muscles

Abductor pollicis brevis

Flexor pollicis brevis

Opponens pollicis

(open and close palm)

what are the hypothenar muscles

Abductor digiti minimi

Flexor digiti minimi

Opponens digiti minimi

(open and close palm)

palmar interossei description and movements

adducts toward middle finger

MCP flexion, PIP and DIP extension

ex: holding book or sandwich

dorsal interossei description and movements

abducts digits

ex: cutting w scissors, typing

remember: PAD: Palmar AD-duct  DAB: Dorsal AB-duct

adductor pollicis

ADducts the thumb to radial side of second digit

ex: lateral pinch, brushing hair, turning a key, swiping a credit card

what do the lumbricals do

MCP flexion, PIP and DIP extension

balance flexion and extension forces

holding book or sandwich