elbow joint and arm Flashcards
muscles that move the elbow joint (compartment only)
anterior compartment
posterior compartment
racial fascia
anterior compartment of the arm consist of
- flexors of elbow and shoulder
- musculocutaneous nerve innervation
- arterial supply from branches of artery
posterior compartment of the arm consist of
- extensors
- radial nerve innervation
- arterial supply from branches of brachial and deep brachial arteries
brachial fascia consist of
inter muscular septa
true or false: flexors are nearly 2x as strong as extensors
true
We are better pullers than ______
pushers
anterior compartment contributes to ____ of the forearm
supination
biceps brachii content
- 3 joint muscle
- glenohumeral, elbow, radi-ulnar joints
- shoulder flexion, elbow flexion, supination
if pronated bicep is a _____. does not flex the elbow
supinator
long head of bicep brachii inserts on
radial tuberosity
short head origin
coracoid process on scapula
brachial content
- strongest flexor
- main flexor of the forearm (flexes in all positions)
- insertion on ulna
- some innervation from radial nerve
does brachial contribute to pronation and supination
no
origin and insertion of brachial
O: distal 1/2 of humerus
I: coronoid process of ulna
- Brachial - primary ___ of elbow.
- Not influenced by forearm position (___,___).
- Steadies movement during elbow _____ (eccentric contraction)
- flexor
- pronated and supinated
- extension
origin and insertion of brachioradialis (posterior forearm)
O: distal humerus
I: styloid process of radius
brachioradialis innervation
radial nerve
brachioradialis action
elbow flexion
semipro nation of the forearm
content of brachioradialis
considered part of the extensor compartment of the forearm but does not act on the wrist
when is brachioradialis most activated
neutral position
if ______ nerve innervation is lost — still retain _____ ______ of forearm
- musculocutaneous
- weak flexion
what innervates coracobrachialis
musculocutaneous nerve
coracobrachialis content
- does not act on elbow joint
- flexion and adduction of arm
- stabilizes glenohumeral joint (shoulder flexion)
origin and insertion of coracobrachialis
O: coracoid process
I:middle humerus (inline with lesser tubercle)
nerve entrapment site for musculocutaneous nerve
coracobrachialis - pierced by it
brachial artery - continuation of axillary artery
- starts medial to humerus
- accompanies the median nerve
- small branches supply muscles of the arm
deep brachial artery accompanies with ____ nerve
radial
Triceps brachii insertion, action, innervation
I: olecranon
A: forearm extension, arm extension (long head)
Inn: radial nerve
most active triceps brachii
medial head
strongest triceps brachii
lateral head
weakest triceps brachii
long head
Lateral and medial head of triceps brachii originates on
posterior humerus
long head triceps brachii originate
infraglenoid tubercle of scapula
anconeus contributes to _____ extension
elbow
ulnar collateral ligament tear is also known as
Tommy John
UCL can stretch, tear or fray from ______ ______
repetitive throwing
grafts are taken from _____, _____, ____, or ______
- hamstring tendon
- patellar ligament,
- plantaris
- palmaris longus tendon
dislocation of elbow joint happens when
- distal end of humerus through weak anterior portion of joint capsule
- ulnar collateral often torn
-olecranon moves relative to humerus
what makes it the terrible trait
- posterior dislocation
- radial head fracture j
- fracture of coronoid process
results of swinging kids
force causes radial head to subluxate from angular ligament
nurse maids elbow or sublimation of radial head
force causes radial head to subluxate from angular ligament
normal carrying angle
5-10 male
10-15 female
cubital fossa is an entrapment for
median nerve
