Posterior Compartment of Arm Flashcards
Which muscle occupies entire posterior compartment of arm
Triceps
Triceps arises by
Long head from scapula and by two shorter heads lat and medial heads from humerus
common tendon of triceps is inserted into
olecranon processo f ulna
Which head of the triceps attaches onto the infra-glenoid tubercle of the scapula?
Long Head
Main action of triceps on elbow
Extensor
Where can the ancones muscle be found
Elbow
What is the action of the triceps and anconeus muscle?
Extension of Forearm, Stablise Elbow during Pronator and Supination
What is the nerve supply to triceps and anconeus?
Radial Nerve
What is one of the terminal branches of posterior cord of brachial plexus
Radial Nerve
The radial nerve supplies what compartment of arm
Posterior and Forearm
Radial nerve innervates
all the extensor muscles of elbow and wrist joint.
The radial nerve enters
the arm anterior to the long head of triceps and runs with the radial artery (deep artery of the arm), a main branch of the brachial artery.
The radial nerve descends
down the around the midshaft region of the humerus in the radial groove, then appears as one of the most lateral structures of the distal arm lying between the humerus and triceps brachii muscles.
What is the segmental (root value) value of the radial nerve?
C5-8
What is the characteristic clinical sign of radial nerve injury?
Weakness in Wrist/Hand/Fingers and Numbness from Triceps to fingers. Problems extending wrist or fingers
