Anatomy of Elbow, Wrist & Hand Flashcards
Bones of the Elbow
- Distal Humerus
- Proximal Radius & Ulna
2 Articulations of the Elbow
- Lateral condyle of humerus (capitulum) w/ Radius
- Medial condyle of humerus (trochlea) w/ Ulna
Lateral condyle of humerus is called
capitulum
Medial condyle of humerus
trochlea
The joint of the elbow is surrounded by a joint capsule w/ 3 supporting ligaments
- Ulnar collateral ligament
- Radial collateral ligament
- Annular ligament
Ligament that stabilizes & encircles the head of the radius
Annular ligament
Motions of the elbow include
flexion & extension w/ pronation & supination
envelops the elbow & superior radioulnar articulation & lubricates the deeper structures of the 2 joints
synovial membrane
2 main bursae of the elbow
- bicipital bursae
- olecranon bursae
cushions the tendon when the forearm is pronated
bicipital bursae
forms a liquid cushion
olecranon bursae
Muscle Flexion of the elbow
- Biceps brachii
- Brachialis
- Brachioradialis
- Pronator Teres
Muscle Extension of the elbow
- Triceps Brachii
- Anconeus
Supination of the elbow
- Biceps brachii
- Supinator
- Brachioradialis
Pronation of the elbow
- Pronator Teres
- Pronator Quadratus
- Anconeus
- Brachioradialis
Blood supply of the elbow
brachial & medial arteries
Nerve supply of the elbow
- musculocutaneous nerve
- Radial nerve
- Median nerve
Bones of the Forearm
- Ulna
- Radius
larger at upper end than at its lower end
ulna
thicker at its lower end than at its upper end
radius
3 articulations of forearm
- Superior radioulnar
- Middle radioulnar
- Distal radioulnar
Pivot joint moving in a ring formed by the ulna & annular ligament
superior radioulnar
shafts of bones ; held together by the oblique cord & interosseus membrane
provides a surface for muscle attachments
middle radioulnar
Pivot joint formed by head of ulna w/ a small notch on radius
held together by anterior & posterior radioulnar ligaments
distal radioulnar
Muscles of the Forearm anteriorly have the
flexors & pronators
Muscles of the forearm posteriorly have the
extensors & supinators
Blood supply of the forearm
brachial artery
brachial artery of the forearm bld supply divides into
radial & ulnar arteries
Nerve supply of the forearm flexor muscles
median nerve
Nerve supply of the forearm extensor muscles
radial nerve
Bones of Wrist & Hand
Distal aspect of radius & Ulnar (2)
8 Carpal Bones (radial to ulnar side)
5 metacarpals
14 phalanges
29 total bones
Proximal row of carpal bones
- Scaphoid (navicular)
- Lunate
- Triquetral
- Pisiform
Distal row of carpal bones
- Trapezium
- Trapezoid
- Capitate
- Hamate
5 articulations of the wrist & hand
- Wrist
- Intercarpal Joints
- Carpometacarpal joint
- Metacarpophalangeal joint (MCP)
- Interphalangeal joints
radius & ulnar
w/ 3 of 4 proximal row carpals: navicular, lunate & triquetral
A condyloid joint
Wrist articulation
condyloid joint permits
flexion, extension, radial, & ulnar deviation
Ligaments of the wrist (4)
- ulnar collateral
- radial collateral
- volar radiocarpal
- dorsal radiocarpal
stabilizing ligaments of the intercarpal joints
- anterior
- posterior
- connecting interosseus ligaments
one major ligament of the intercarpal joints
transverse carpal ligament
(flexor retinaculum)
Located on the volar aspect of the carpals & serves as the roof of the carpal tunnel
transverse carpal ligament (flexor retinaculum)
Ligaments of the Metacarpophalangeal joint (MCP)
collateral & accessory volar ligaments
interphalangeal joints consists of
proximal interphalangeal joint (PIP)
distal interphalangeal joint (DIP)
Blood supply of the wrist & hand
radial & ulnar arteries
Nerve supply of the wrist & hand
ulnar nerve
radial nerve
median nerve
Middle Deltoid action
ABDuction
Anterior deltoid action
ABDuction
shoulder flexion
internal rotation
posterior deltoid action
ABDuction
shoulder extension
external rotation
Supraspinatus action
ABDuction
Infraspinatus action
external rotation
subscapularis action
shoulder extension
internal rotation
teres minor action
external rotation
Latissimus dorsi action
shoulder extension
internal rotation
adduction
teres major action
aDDuction
shoulder extension
internal rotation
Pectoralis major action
ADDuction
shoulder flexion
internal rotation
coracobrachialis action
adduction
shoulder flexion
long head of biceps action
shoulder flexion
elbow flexion
supination
short head of biceps action
elbow flexion
supination
Long head of triceps
aDDuction
shoulder extension
elbow extension
Lateral head of triceps
elbow extension
Medial head of triceps
elbow extension
brachialis
elbow flexion
brachioradialis
elbow flexion
assists in pronation & supination
Pronator teres
elbow flexion
pronation
pronator quadratus
pronation
anconeus
elbow extension
pronation
supinator
supination