elbow anatomy Flashcards
(29 cards)
what are the three joints at the elbow
- Ulnohumeral
- Radiocapitellar
- Proximal Radioulnar
what are the characterisitics of the ulnohumeral joint
•Articulation between ulna and humerus •True hinge joint •Flexion/Extension •Very stable joint
what are the characterisitics of the proximal radioulnar joint
Articulation between radial
head of radius and radial notch of ulna
•Pivot joint
•Pronation/ Supination
explain the joint capsule in the elbow
- One thin capsule surrounds all three joints
- Synovial membrane lines the capsule
- Capsule is lax in flexion and taut in extension
what are the three bundles apart of the UCL
- Anterior bundle
- Posterior bundle
- Oblique bundle
does the UCL resist valgus or varus force
valgus
does the RCL resist varus or valgus force
varus
what is the RCL for
•Accessory ligament
•Stabilizes articulation between
radial head and ulna
what are the contents of the cubital fossa
- Radial nerve
- median nerve
- brachial artery
- posterior interosseous nerve
- ulnar artery
- radial artery
where is the bursa located
•Located between skin and
olecranon process
true or false
the olecranon bursa is the most common site in the body
true
what does the raduis articulate with
• Ulna
• Proximal row of
carpal bones
true or false
the ulna articulates with the carpal bones
false
where does the sesamoid bones lie in the hand
Typically lie in the
opponens pollicus muscle
what is the thenar eminence and what muscles make it up
Muscle mass on radial side of palm • Adductor pollicus brevis • Flexor pollicus brevis • Opponens pollicus
what is the hypothenar eminence and what muscles make it up
Muscle mass on ulnar side of palm • Adductor digiti minimi • Flexor digiti minimi • Opponens digiti minimi
which nerve runs through the tunnel of guyon
ulnar
what are the bony and soft tissue borders of the tunnel of guyon
Bony borders
• Hook of hamate
• Pisiform bone
Soft tissue borders
• Pisohamate ligament
• Flexor retinaculum
what are the borders of the snuffbox
- EPB tendon
- Abd PL tendon
- EPL tendon
what does the roof of the carpal tunnel compose
• Transverse carpal
ligament (flexor retinaculum)
whats the name of the sturcture that holds the bones together in the forearm
interosseous membrane
When talking about the distal radioulnar joint what does the head of the ulna articulate with
ulnar notch of radius
when talking about the radiocarpal joint what does the radius articulate with
proxmial caprals
• Scaphoid
• Lunate
• Triquetrum (slight)
what motion does the distal radioulnar joint allow
pronation/supination
