Arm Flashcards
What are the axio-appendicular muscles? (5)
Trapezius, serratus anterior, rhomboid major and minor, levator scapulae
Trapezius is innervated by which CN?
CNXI
Serratus anterior is innervated by which nerve?
Long thoracic nerve
Rhomboid minor & major is supplied by which nerve?
Dorsal scapular nerve
Revise scapular anatomy, name major points of interest
- Acromion
- Coracoid process
- Supraspinous fossa
- Infraspinous fossa
- Medial & Lateral borders
What are the 4 rotator cuff muscles?
Supraspinatus
Infraspinatus
Teres minor
Subscapularis
Remember: SITS. First 3 attached to greater tuberosity, last one to lesser tuberosity.
The rotator cuff muscles are responsible for what overall purpose?
Hold head of humerus in glenoid fossa
How much of the glenoid fossa is in touch with the humeral head at any given point?
1/3rd
What’s the main difference between the acetabulofemoral joint and glenohumeral joint?
Glenohumeral is much shallower
How many compartments of the arm?
2 (anterior & posterior; sometimes a third compartment is referred to “Compartment of Henry”)
What are the 3 muscles of the anterior arm?
Biceps brachii, brachialis, coracobrachialis
Which nerve innervates the anterior compartment muscles?
Musculocutaneous nerve
What are the main action(s) of the anterior arm?
Flexion of arm & forearm
What muscle is present in the posterior arm compartment?
Triceps brachii
Which nerve innervates the posterior arm compartment?
Radial nerve
