KIN 100 - Arm (lecture 8) Flashcards
Describe the ulna
- stabilizing bone in the forearm
- ulna is medial to, and longer than, the radius
Describe the radius
the bone that rotates during pronation and supination
What are the anterior compartment muscles of the arm (3)
- biceps brachii
- Brachialis
- Coracobrachialis
Biceps brachii
Proximal attachment: Long head: supraglenoid tubercle
Short head: coracoid process
Distal attachment: radial tuberosity
Innervation: Musculocutaneous nerve
Action: Forearm supination, weak elbow flexion, assist with shoulder flexion and abduction
What are the posterior compartment muscles of the arm (2)
- Triceps brachii
- Anconeus
Which tendon is anchored within the bicipital groove by the transverse humeral ligament
long head of biceps brachii
Which tendon attaches to the coracoid process
short head of biceps brachii
Do biceps brachii have any attachments to the humerus
no
where does Brachialis lie
deep to biceps brachii
Brachialis
proximal attachment: distal half of anterior surface of humerus
distal attachment: coronoid process
Innervation: Musculocutaneous nerve
Action: elbow flexion
What do biceps brachii and brachialis have in common
same innervation - musculotcutaneous nerve
Coracobrachialis
proximal attachment: coracoid process
distal attachment: mid shaft of humerus, medial side
Innervation: musculocutaneous nerve
Action: shoulder flexion, shoulder adduction
Triceps brachii
Proximal attachment: - Long head: infraglenoid tubercle
- lateral head: Posterior surface of humerus, proximal and lateral to the radial groove
- medial head: posterior surface of humerus , distal and medial to the radial groove
Distal attachment: Olecranon process of ulna
Innervation: radial nerve
Action: elbow extension
Anconeus
proximal: lateral epicondyle of humerus
distal: lateral surface of olecranon and proximal shaft of ulna
Innervation: radial nerve
Action: Tenses the elbow capsule so that it doesn’t get pinched during extension
When does the brachial artery arise
When the axillary artery passes the inferior border of teres major
Where does the profunda brachii (deep brachial artery) arise
arises proximally in the arm and accompanies the radial nerve in the posterior compartment
Describe the continuation of the brachial artery
continues distally , traveling alongside the median nerve until it reaches the cubital fossa (anterior aspect of elbow joint)
What are the three superficial veins
- Cephalic vein
- Basilic vein
- Median cubital vein
Describe the location of the cephalic vein
- begins on the lateral aspect of the hand and travels proximally up the lateral side of the upper limb
- located on deltopectoral triangle
Where does the cephalic vein drain into
the terminal part of the axillary vein
Describe the location of the basilic vein
begins on the medial aspect of the hand and travels proximally up the medial side of the upper limb
Which vein unites with the brachial vein to form the axillary vein
the basilic vein
Describe the orientation of the median cubital vein and its function
crosses anterior to the cubital fossa
communicates with the cephalic and basilic veins
What are the four main nerves that passes through the arm
- Musculocultaneous
- Median
- Ulnar
- Radial
Where does the musculotcutaneous nerve branch from
the lateral cord of the brachial plexus
What does musculocutaneous nerve pierce through and where does it lie in between
- pierces coracobrachialis
- lies between muscle bellies of biceps brachii and brachialis
What muscles does the musculocutaneous nerve supply
All three 3 mucles of the anterior compartment of the arm (biceps brachii, brachialis, coracobrachialis )
What does the median nerve branch from
the medial and lateral cords of the brachial plexus
What does the median nerve run alongside with
the brachial artery
What arm muscles does the median nerve supply
no branches and supplies no muscles in the arm
- supplies most muscles of the anterior forearm and hand
What does the ulnar nerve branch from
branches from the medial cord of the brachial plexus
What arm muscles does the ulnar nerve supply
supplies no arm muscles
What does the ulnar nerve pass through
the groove between the medial epicondyle and the olecranon process
What nerve is responsible for the feeling of “hitting your funny bone”
pinching of ulnar nerve between medial epicondyle and another harder surface
What muscles does the ulnar nerve supply
one and a half musles in the anterior forearm and many muscles in the hand
Where does the radial nerve branch from
posterior cord of the brachial plexus
What compartment does the radial nerve pass into and what bone does it travel through
- the posterior compartment of the arm with the profunda brachii artery
- travels within the radial/spiral groove of the humerus
What muscles does the radial nerve supply
all muscles of the posterior compartment of the arm
Near the lateral epicondyle, what does the radial nerve split into and describe them
- Deep branch that supplies muscle (posterior forearm compartment)
- superficial branch that supplies the skin
