Arm Flashcards
Brachial Fascia forms
a sheath for muscles of the arm.
Brachial Fascia sends among the muscles
two fibrous septa
- lateral intermuscular septa
- medial intermuscular septa
Functions of 2 septa
separates flexor muscles (anterior group) from extensor muscles (posterior group)
provides additional surfaces for muscle attachment
Lateral intermuscular septum is attached to
humerus lateral border, lateral supra-condylar ridge down to lateral epicondyle
medial intermuscular septum is attached to
thick and attached to humerus medial border and medial supra-condylar ridge down to medial epicondyle
Anterior/ventral/flexor muscles
biceps brachii
coraco-brachialis
brachialis muscle
biceps brachii muscle origin
2 heads
short- tip of coracoid process on scapula
long - supra glenoid tubercle of scapula
biceps brachii insertion
2 head unite to be inserted by:
bicipital tendon: into radial tuberosity
bicipital aponeurosis: into cubital fossa
action of biceps brachii
- powerful supinator when elbow is flexed
- flexes elbow
- tendon of long head steadies humerus
- short head helps in flexion of shoulder joint
coraco-brachialis muscle origin
coracoid process (like short head of biceps)
coraco-brachialis insertion
rough impression on shaft of humerus
coraco-brachialis action
assists in flexion and adduction of shoulder joint
relations of coraco-brachialis
pierced by: muscolo-cutaneous nerve
medial to biceps
brachialis muscle origin
- shaft of humerus
2. medial and lateral intermuscular septa
insertion of brachialis muscle
coranoid process and ulnar tuberosity