muscles of the arm Flashcards
The intermuscular septa of the arm divide it into…
Anterior + posterior compartments
The anterior compartment of the arm contains…
The flexors
The posterior compartment of the arm contains…
The extensors
Name the flexors of the arm
Coracobrachialis, brachialis + biceps brachii
Name the extensors of the arm
Triceps
The lateral intermuscular septum is perforated by…
The brachial artery + radial nerve
The medial intermuscular septum is perforated by…
The ulnar nerve
The coracobrachialis originates in…
The coracoid process of the scapula
The coracobrachialis inserts into…
The anteroproximal portion of the humeral shaft
Nerve that innervates all the muscles in the anterior compartment
Musculocutaneous
Nerve that innervates the extensors in the arm
Radial nerve
Origin of the brachialis
Anterior portion of distal humeral shaft
Where does the brachialis insert?
Into the tuberosity of the ulna
Function of the coracobrachialis
Shoulder flexion (elevation)
Function of the brachialis
Elbow flexion
Muscle with 2 heads that inserts into the bicipital tuberosity of the radius
Biceps brachii
The long head of the biceps originates in…
The supraglenoid tubercle
The short head of the biceps originates in…
The coracoid process
Function of the biceps
Mainly supination, also flexion
… of the elbow works best when done at the same time as supination
Flexion
Name the 3 heads of the triceps
Long, medial and lateral
The long head of the triceps originates in…
The infraglenoid tubercle
The medial head of the triceps is…
The deepest one
The medial head of the triceps originates in…
The posteromedial portion of the humeral shaft, distal to the radial groove
The lateral head of the triceps originates in…
The posterolateral portion of the humeral shaft, proximal to the radial groove
2 of the 3 tendons of the triceps fuse. Name them
Medial + lateral heads
Site of insertion of the triceps
Olecranon
Main vessel irrigating the arm
Brachial artery
Where does the brachial artery end?
In the cubital fossa (anteromedially to the neck of the radius)
Where do you place the stethoscope to measure blood pressure (in the arm)? Why?
In the anteromedial region, proximal to the elbow skinfold.
Because of the trajectory of the brachial artery (first medial + then anterior to the humerus)
Where does the radial artery originate?
In the cubital fossa (anteromedially to the neck of the radius)
Muscle that covers the radial artery in the forearm
Brachioradialis
Vessel that, once it reached the wrist, divides into a main branch (surrounding the trapezius + entering the palm), forming the deep palmar arch
Radial artery
