Elbow & Cubital Fossa Flashcards
A - musculocutaneous nerve
B - median nerve
C - axillary nerve
D - ulnar nerve
Anterior Section of upper arm:
nerve supply? [1]
what movement does it cause? [1]
poster Section of upper arm:
nerve supply? [1]
what movement does it cause? [1]
Anterior Compartment:
- musculocutaneous nerve
- shoulder and elbow flexors
Posterior Compartment
- radial nerve
- shoulder and elbow extensors
what are muscles of the anterior comparment of arm? [3]
which is most superficial?
BBC !! Bicep brachii, Brachialis & Coracobrachialis
order:
- superficial: bicep brachii
(C5,C6, C7 - musculocutenous nerve)
what is 1 & 2?
2 coracobrachialis
1. brachialis
which is this muscle?
bicep brachii
what muscle is this
brachialis
brachialis
attachment points? [2]
movements? [1]
brachialis:
- anterior aspect of elbow joint. distal humerus –> **coronoid pross of ulna
- flexes elbow in all positions**
coracobrachialis
attachment points? [2]
movements? [2]
- corocoid proces of scapula to humerus
- only acts on shoulder joint: flexes and adducts shoulder
- resists dislocation
Bicep brachii
Where do the 2 heads of the bicep brachii attach? [2]
The two heads join together and attach onto which bone? [1]
Describe the movements of the bicep brachii muscle [2]
Location of 2 heads:
- short head - found medially. attaches to **corocoid process **
- long head - found laterally (L4L) attaches to supraglenoid tubercle
Join together to form one muscle, together inserts onto radius at the radial tuborisity
movements:
- powerful supinator
- flexor and shoulder and elbow
which muscles are used to flex your forarm when:
a) pronated
b) supinated
pronated forearm - brachialis used to flex elbow joint
supinated forarm - brachiali and bicep brachii flex elbow joints
ruptured one of bicep brachii tendons -> causes muscles to bunch and shoot down arm
musculocutaneous nerve
what does it innervate? [2]
musculocutaneous nerve
- provides motor innervation for anterior compartment of upper arm
THEN - at elbow onwards, provides sensory innervation for lateral skin of foreram: becomes lateral cuteanous nerve of the forearm
Tricep brachii
What are the three heads of the tricep brachii? [3]
Where does the tricep brachii insert inferiorly [1]
Which movements does tricep brachii permit? [2]
Which nerve is the tricep brachii innervated by? [1]
Heads:
* long head - passes over shoulder joint
* lateral head
* medial head
Insertion:
* Join together to form one common muscle: tendon inserts on olecranon process of elbow (pointy bit)
Movements:
- extend elbow
- weak shoulder extensor
Innervation:
* radial nerve
where do u find the radial nerve in relation to tere minor, teres major, and tricep muscles?
in the triangular interval
which nerve is vulnerable to mid-humeral shaft fracture?
- Muscularcutaneous
- axillary
- median
- radial
- ulnar nerve
which nerve is vulnerable to mid-humeral shaft fracture?
- Muscularcutaneous
- axillary
- median
- *- radial**
- ulnar nerve
describe the paths of the radial and ulnar nerves xox
radial nerve
-runs in posterior compartment of upper arm
THEN
- reaches intermuscular septum & from here runs anterior to lateral epicondyle at the eblow
ulnar nerve
-runs in anterior compartment of upper arm
THEN
- reaches intermuscular septum & from here runs posterior to medial epicondyle at the elbow
Describe path of the median nerve [2]
- Rruns in anterior compartment of upper arm
- Crosses over the anterior aspect of the elbow to enter anterior compartment of the forearm
A: short head of bicep brachii
B: radial nerve
C: brachial artery
D: tricep (long head)
E: musculocutaneous nerve
What are the 3 joints of the elbow?
Ulnohumeral joint is where movement between the ulna and humerus occurs.
Radio humeral joint is where movement between the radius and humerus occurs.
Proximal radioulnar joint is where movement between the radius and ulna occurs
capitulum articulates with which bone? [1]
trochlea articualtes with which bone? [1]
capitulum articulates with which bone? [1]
- radius
trochlea articualtes with which bone? [1]
- ulnar
which is the stablilisng bone of the forearm? [1]
which is the moblile bone of the forearm?[1]
which is the stablilisng bone of the forearm? [1]
- ulnar
which is the moblile bone of the forearm?[1]
- radius
State which ligaments are found around the elbow joint [2]
Which movements do they help cause movement of? [1]
Ligaments:
- annular ligament
- radial collateral ligament
- ulnar collateral ligaments
together reinforce hinge movement
Describe the role of the:
annular ligament [1]
Which joint does it help to create? [1]
Which movements does this joint allow? [2]
Annular ligament: encircles the head of the radius and keeps in the radial notch of the ulnar: creates proximal radioulnar joint
Permits:pronation and supination of the formarm
which ligament is commonly torn in young girls?
Ulnohumeral joint
Radio humeral joint
Proximal radioulnar joint
why?
which ligament is commonly torn in young girls?
Ulnohumeral joint
Radio humeral joint
Proximal radioulnar joint
bc annular ligament if loosely attached to the ulnar in infants
which muscles are used for pronation & supination?
which muscles are used for flexion and extension of elbow joint?
what is the cubital fossa?
The cubital fossa refers to the anterior depression in front of your elbow joint
what are the boundaries of the cubital fossa?
Boundaries of the cubital fossa:
- superior border: line from the lateral to the medial epicondyle
- flexor muscles of the forearm and the bracioradialias acting as borders also.
median nerve !
