Week 10- Arm and Cubital Fossa Flashcards
What is found in the anterior compartment of the arm?
What is the function of the anterior compartment of the arm?
BBC- brachialis, biceps brachii and coracobrachiallis
Musculocutaneous nerve
Flex the elbow and arm.
Describe the attachments of the biceps brachii muscle?
Biceps brachii has two heads.
The long head attaches from the supraglenoid tubercle on the scapula to the radial tuberosity.
The short head attaches from the corocoid process and attaches to the radial tuberosity.
Describe the attachments of the biceps brachii muscle?
Biceps brachii has two heads.
The long head attaches from the supraglenoid tubercle on the scapula to the radial tuberosity.
The short head attaches from the corocoid process of the scapula and attaches to the radial tuberosity.
What does the biceps brachii do?
Its main job is to supinate the forearm. It also is a weak flexor of the arm at the elbow and shoulder.
What nerve supplies the anterior arm?
Musculocutaneous nerve
What are the attachments of coracobrachiallis?
Attach from the corocoid process of the scapula to the medial mid-humeral shaft.
What is the function of coracobrachiallis?
Responsible for flexion of the arm and adduction.
Which nerve supplies biceps brachii?
C5-C6 musculocutaneous nerve
Which nerve supplies coracobrachiallis?
C5-C7 musculocutaneous nerve.
What are the attachments of the brachiallis muscle?
Distal half of the anterior surface of the humerus and inserts onto the ulnar tuberosity and coronoid process (of the ulnar).
What is the function of the brachiallis muscle?
Flexion at the elbow.
Which nerve supplies the brachiallis muscle?
Musclocutaneous nerve (C5, 6) A small component of the lateral fibres may be supplied by the radial nerve.
Which muscle is in the posterior compartment of the arm?
Triceps brachii
What are the attachment points of the triceps muscle?
It has three heads.
Long head attaches to the infraglenoid tubercle on the scapula.
Medial head from the posterior surface of the shaft of the humerus.
Lateral head from the humerus, superior to the radial groove.
Insert onto the olecranon of the ulna.
What is the function of the triceps brachii?
Extension at the elbow.
The long head also resists dislocation at the shoulder joint.
What nerve supplies the triceps muscle?
Radial nerve (C6-8)
Where does the brachial artery begin?
After crossing the teres major muscle.
What is the first branch the brachial artery gives off?
Profunda brachii artery. This passes through the triangular space with the radial nerve and runs down the posterior surface of the arm.
What are the other branches of the brachial artery?
There is one radial collateral vessel and two ulnar collateral vessels. The radial collateral vessel is a branch from profunda brachii and the ulnar collateral vessels are direct branches from the brachial artery.
Where is the cubital fossa?
It is a depression anterior to the elbow joint.
What are the boundaries of the cubital fossa?
Laterally- brachioradiallis muscle
Medially- pronator teres
Floor- Brachiallis muscle
Roof- skin, fascia and bicipital aponeurosis
What are the two main veins draining the upper limb?
The cephalic and basilic veins.
What is the vein that connects the basilic and cephalic veins?
median cubital vein.
What are the contents of the cubital fossa?
From medial to lateral: Median nerve Bifurcation of the brachial artery into radial and ulnar. Tendon of biceps Radial nerve Deep veins accompanying the artery.
