muscles of arm

Question 1

what are the proximal and distal attachments of triceps bracchi?

Answer 1

distal: proximal end of olecranon of ulna and fascia of forearm
proximal - lateral: posterior surface of humerus superior to radial groove.
proximal - medial: posterior surface of humerus inferior to radial groove.
proximal - long: infraglenoid tubercle of scapula

Question 2

what is the action and function of anconeus? what nerve is it innervated by?

Answer 2

action: assists triceps in extending forearm and abducts ulna during pronation
function: stabilises elbow joint
innervation: radial nerve

Question 3

what is the action and function of biceps bracchi? what nerve is it innervated by?

Answer 3

action: supinates forearm, flexes forearm
function: short head resists dislocation of shoulder
innervation: musculocutaneous nerve

Question 4

what are the distal and proximal attachments of biceps bracchi?

Answer 4

distal: attached to tuberosity of radius and fascia of forearm via bicipital aponeurosis.
proximal - short head: tip of coracoid process of scapula.
proximal - long head: supraglenoid tubercle of scapula.

Question 5

what is the action and function of coracobrachialis? what nerve is it innervated by?

Answer 5

action: helps flex and abduct arm.
function: resists dislocation of shoulder.
innervation: musculocutaneous nerve.

Question 6

what are the proximal and distal attachments of coracobrachialis?

Answer 6

proximal: tip of coracoid process of scapula.
distal: middle third of medial surface of humerus.

Question 7

what is the action of brachialis? what nerve is it innervated by?

Answer 7

action: flexes forearm in all positions.
innervation: musculocutaneous nerve.

Question 8

what are proximal and distal attachments of brachialis?

Answer 8

proximal: distal half of anterior surface of humerus.
distal: coracoid process and tuberosity of ulna.

Question 9

what muscles are supplied by musculocutaneous nerve?

Answer 9

BBC - biceps bracchi, brachialis and coracobrachialis.

Question 10

what is the action and function of triceps bracchi? what nerve is it innervated by?

Answer 10

action: chief extensor of forearm
function: long head resists dislocation of humerus
innervation: radial nerve

Question 11

what are the origins of biceps bracchi?

Answer 11

short corner, long surprise
short head originates from coracoid process
long head originates from supraglenoid cavity.

Question 12

which muscles flex the elbow?

Answer 12

3 B’s
brachialis
biceps bracchi
brachioradialis