Flashcards in 01 Elbow Deck (68)
- long bone of the arm
- has a shaft, rounded head, and a distal end
Anatomical neck of the humerus is proximal or distal to the head
Greater tubercle is located on the _____ aspect of the proximal humerus
Lesser tubercle is on the _______ humerus just distal to the anatomical neck
The intertubercular sulcus is a groove for _____
common flexor origin
common extensor origin
Lateral articular surface of the humerus is known as the
The capitulum articulates with the
The medial articular surface of the humerus is known as the
The trochlea articulates with the
trochlear notch of the ulna
Coranoid and radial head lie on the
anterior distal surface
Olecranon fossa lies on the
posterior distal surface
Elbow joint is a compound synovial joint that includes
Location of the humeroradial joint
between the capitulum of the humerus and head of the radius
Two collateral ligaments that support the elbow joint
-medial (ulnar) collateral
-lateral (radial) collateral
Movements permitted at the elbow joint
Synovial cavity of the elbow joint is continuous with the synovial cavity of which other synovial joint
superior (proximal) radioulnar joint
Which nerve innervates muscles of the posterior compartment of the arm
Which nerves innervate the forearm pronators
-pronator teres (median)
-pronator quadratus (anterior interosseous...median)
Biceps tendon reflex correlates with
Brachioradialis tendon reflex correlates with
Triceps tendon reflex correlates with
bursa in the elbow
Bursa sacs communicate with the joint through the...
The UCL prevents...
Annular ligament of the radial head supports the proximal radio-ulnar joint while permitting rotation during
The head of the radius forms a ______ joint with the capitulum of the humerus
pivot synovial joint
Why is the fat pad not impacted during flexion?
biceps blocks it
function of interosseous membrane
- transfers or dissipates load
- radius is a bigger, bulkier bone, but a lot of stress goes through it »transfers load to the ulna
distal radius articulates with the
scaphoid and lunate carpal bones at the radiocarpal joint
AVN is common in which bone and why?
due to fractures at the neck
What force does the MCL resist?
What is referred to when athletes tear an elbow ligament?
What does the LCL blend with?
Where does pronation and supination occur?
at proximal and distal radioulnar joints
During ________, the radius is crossed over the ulna
arthrokinematics of pronation and supination
1. proximal: SPIN
2. distal: CONCAVE ON CONVEX
distal attachment of biceps brachii
What does the musculocutaneous nerve innervate?
- goes through anterior compartment of the arm
- exits medial to the bicipital aponeurosis at elbow
radial nerve path
- passes posterior to humerus between biceps head
- winds around spiral groove to lateral arm
- reaches anterior compartment above the elbow
ulnar nerve path
- travels in anterior compartment
- passes from anterior to posterior through medial IM septum of distal ⅓ of arm
- at elbow, it passes posterior to medial epicondyle
ulnar nerve doesn’t innervate
muscles of the forearm
Which nerve is susceptible to injury?
ulnar nerve at the medial epicondyle
Which nerve is vulnerable in humeral fracture?
Where does the radial nerve enter the anterior compartment of the arm?
through the lateral intermuscular septum in the distal arm
both innervated by radial nerve
Where is the ulnar nerve located at the cubital fossa?
- posterior to the intermuscular septum
- posterior to the medial epicondyle in the cubital tunnel
The _____ nerve lies deep to the brachioradialis. It divides into the deep and superficial branches. The superficial branch continues under the ________ and the deep enters the _______.
pronator muscles are innervated by which nerve?
What muscles are responsible for supination and what innervates them?
- supinator (radial nerve)
- biceps (musculocutaneous)
- extensor pollicis longus
Innervation of wrist flexors
- ulnar nerve innervates medial (ulnar) wrist flexor
- all others innervated by branches of the median nerve
muscles that cross the elbow
from medial epicondyle
1. flexor pollicis longus (FPL)
2. palmeris longus
3. flexor digitorum superficialis (FDS)
4. flexor carpi ulnaris (FCU)
5. flexor carpi radialis (FCR)
6. pronator teres
muscles that cross the elbow
from common tendon off lateral epicondyle
1. extensor digitorum
2. extensor carpi radialis longus (ECRL)
3. extensor carpi radialis brevis (ECRB)
deep flexors that don’t cross the elbow
flexor digitorum profundus
deep extensors that don’t cross the elbow
1. abductor pollicis longus
2. extensor pollicis longus
3. extensor pollicis brevis
4. extensor indicis
1. extensor carpi radialis longus
2. extensor carpi radialis brevis
3. extensor carpi ulnaris
4. extensor digitorum
5. extensor indicis
6. extensor digiti minimi
superficial muscles of the posterior compartment have a common attachment on _______ and are innervated by _______
- the lateral epicondyle of the humerus
- branches of the radial nerve
shoulder abduction (palpate deltoid)
elbow flexion, wrist extension
elbow extension, wrist flexion
finger abduction and adduction
- normal 15% angle between humerus and radioulnar long axis
- more may indicate excessive laxity or injury to MCL
oblique cord function
transfer distractive forces from radius to ulna