3C - forearm to hand Flashcards
radius
lateral bone of the forearm
ulna
medial bone of the forearm
interosseous border
attachment along shaft for membrane dividing forearm into anterior and posterior segments
radial head
articulates with capitulum of humerus (at elbow)
colles fracture
distal radius is broken by falling onto an outstretched hand (FOOSH)
dinner fork deformity
colle’s fracture
radial notch
where the radius articulates at proximal radioulnar joint
proximal radioulnar joint
head of the radius articulates with radial notch of ulna
distal radioulnar joint
head of ulna articulates with ulnar notch of radius
olecranon
pointy part of elbow on posterior aspect
coronoid process
point of elbow on anterior aspect
ulnar tuberosity
insertion of brachialis
head of ulna
distal end of ulna
interosseous membrane
membranous ligamental structure between the shafts of the ulna and radius bones
supination
the radius and ulna are parallel, anatomical position
pronation
the radius and ulna are crossed
carpal bones
wrist bones; scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitate, hamate
metacarpals
hand bones
which phalanx do thumbs and big toes not have
middle phalanx
carpal metacarpal joint
joint between carpals and metacarpals (CMC)
metacarpal phalangeal joint
big knuckles, where the carpal joints meet the phalanges (MCP)
proximal interphalangeal joint
between proximal and middle phalanges
distal interphalangeal joint
between middle and distal phalanges
forearm flexors innervation
median nerve, ulnar nerve (anterior)
forearm extensors innervation
radial nerve (posterior)
pronator teres
pronation of forearm
flexor carpi radialis
flexes wrist and abducts hand
palmaris longus
flexion of hand
flexor carpi ulnaris
flexes and adducts hand
forearm flexors order
- Pass, Fail, Pass, Fail
- Pronator teres, Flexor carpi radialis, Palmares longus, Flexor carpi ulnaris
brachioradialis
flexes forearm at elbow
flexor digitorum superficialis
flexes wrist and middle phalanges of fingers 2-5
flexor digitorum profundus
tendons split when they reach the PIP joint, which allows this muscle through; flexes distal phalanges
pronator quadratus
pronates forearm
flexor retinaculum
thick band of fascia that keeps tendons pinned down as they travel through the wrist
median nerve
- in front of medial epicondyle.
- under/through pronator teres
- between flexor digitorum profundus and superficialis
pronator teres syndrome
entrapment or compression of the median nerve, weak wrist flexion, no IP (interphalangeal) flexion at thumb
ulnar nerve
posterior to medial epicondyle
supinator
supinates forearm
extensor carpi radialis
extends wrist and abducts hand
extensor digitorum
extends fingers and the wrist
extensor digit minimi
extends little finger
extensor carpi ulnaris
extends and adducts wrist
where do all extensor muscles come off of
lateral epicondyle
where do all flexor muscles come off of
medial epicondyle
extensor retinaculum
holds tendons of extensor muscles in place
epicondylitis
inflammation of the tissues surrounding the elbow at either the medial or lateral epicondyle
golfers elbow
inflammation of tendons at the medial epicondyle (medial epicondylitis)
tennis elbow
inflammation of tendons at the lateral epicondyle (lateral epicondylitis)
outcropping muscles
abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus
- INTERACT AT THUMB
abductor pollicis longus
abducts thumb
extensor pollicis longus
extends thumb
extensor pollicis brevis
extends thumb
extensor indicis
extends index finger
radial nerve
sensory-motor nerve that, with its branches, supplies the thumb side of the arm and back of the hand
is the radius thicker or thinner at the distal end than the ulna
thicker
what does the radius articulate with
wrist
what does the ulna articulate with
radius
ulnar notch
articulates with the head of the ulna
styloid process of radius
insertion of brachioradialis
radial collateral ligament
connects the lateral epicondyle of the humerus to the radius
ulnar collateral ligament
connects the medial epicondyle of the humerus to the ulna
radioulnar joint
articulation between the radius and ulna and their proximal ends; produces supination and pronation
radioulnar ligament
connects radius and ulna
radoiocarpal ligaments
radius and carpal bones
articular disc
forms a pad between articulating bones that crosses the entire joint capsule
radoiocarpal joint
pertaining to the joint between the radius and wrist
ulnocarpal disc
from distal radioulnar joint
forearm pronators
pronator teres, pronator quadratus
forearm supinators
biceps brachii, supinator
forearm flexors
- palmaris longus
- flexor carpi radialis
- flexor carpi ulnaris
- flexor digitorum superficialis
- flexor digitorum profundus
forearm extensors
- extensor carpi radialis
- extensor digitorum
- extensor digiti minimi
- extensor carpi ulnaris
- abductor pollicis longus
- extensor pollicis longus
- extensor pollicis brevis
- extensor indicis
movement at the wrist
condyloid (flexion and extension; abduction and adduction). Primarily caused by “carpi” muscles of the forearm
carpal tunnel
space between carpal bones and flexor retinaculum. Includes median nerve, flexor digitorum superficialis and profundus
carpal tunnel syndrome
compression of the median nerve as it passes between the ligament and the bones and tendons of the wrist. Thenar (thumb) muscle weakness, and skin paraesthesia
digit 1
pollicis (thumb)
digit 2
index finger
digit 3
middle finger
digit 4
ring finger
digit 5
digiti minimi (pinky)
scaphoid fracture
break in scaphoid bone in thumb, palpation of anatomical snuffbox will be painful
avascular necrosis
an area of bone tissue death caused by insufficient blood flow
lumbricals
flex metacarpophalangeal joint, extend interphalangeal joints
dorsal interossei
4; abduct digits from midline (digit 3), ulnar nerve
4 DAB
D=dorsal, AB=abduct
palmar interossei
3; adduct digits to midline (digit 3), ulnar nerve
3 PAD
P=palmar, AD=adduct
thenar muscles
abductor pollicis brevis, flexor pollicis brevis, opponens pollics. Muscles that move the thumb
posterior forearm compartment
- extensors
- radial nerve
anterior compartment
- flexors
- median and ulnar nerve