L11- arm and cubital fossa

Question 1

what are the muscles of the anterior compartment of the arm?

Answer 1

coracobrachialis and biceps brachii and brachialis

Question 2

what is the muscle of the posterior compartment of the arm?

Answer 2

it contains only the triceps brachii

Question 3

mention the origin insertion nerve supply and action of the coracobrachialis muscle

Answer 3

originates from the apex of the coracoid process of the scapula and insertion is the mid-shaft of the humerus on the medial side. it is supplied by the musclocutaneous nerve and radial nerve and its responsible for the flexion of the shoulder joint

Question 4

mention the origin insertion nerve supply and action of the biceps brachii muscle

Answer 4

originates form the short head from the coracoid process of the scapula and long head from the supraglenoid tubercle of scapula. insertion is the radial tuberosity. it is supplied by the musclocutaneous nerve. it is responsible for the flexion of the elbow and the flexion if the shoulder and supinator of the forearm

Question 5

mention the origin insertion nerve supply and action of the brachialis muscle

Answer 5

originates from the front of the humerus and insertion is coracoid process of the ulna it is supplied by the musclocutaneous nerve and its responsible for the flexion of the elbow

Question 6

mention the origin insertion nerve supply and action of the triceps brachii muscle

Answer 6

long head originates from the infraglenoid tubercle of the scapula and lateral and medial head originates from the posterior surface of the humerus. insertion is olecranon. it is supplied by the radial nerve and causes extension of the elbow joint and the long head can extend and cause abduction of the shoulder joint

Question 7

which muscle is the main supinator of the forearm?

Answer 7

it is the biceps brachii and if paralyzed will weaken the supination of forearm

Question 8

which muscle is the main extender of the elbow?

Answer 8

it is the triceps brachii and if paralyzed will cause paralysis in extension of elbow

Question 9

what are the 3 superficial veins of the arm?

Answer 9

cephalic vein
basilic vein
medial cubital vein

Question 10

what is the course of the cephalic vein?

Answer 10

runs on the lateral side of the arm and ends by piercing the clavipectoral fascia to join the axillary vein

Question 11

what is the course of the basilic vein ?

Answer 11

runs on the medial side of the arm till the middle where it pierces the deep fascia to join the 2 vena comitantes of the brachial artery to form the axillary artery

Question 12

what is the function of the medial cubital vein?

Answer 12

it connects the cephalic and basilic veins together

Question 13

what is the site and course of the brachial artery?

Answer 13

it is found in the anterior compartment of the arm and it begins as a continuation of the axillary artery at the lower boarder of the teres major muscle. upper part of the artery runs laterally to the humerus and lower part of the artery runs medially to the humerus and it terminates just distal to the elbow joint and divides into radial artery and ulnar artery

Question 14

what are the 7 branches of the brachial artery?

Answer 14

profunda brachii artery
nutrients artery
muscular artery
superior ulnar colateral artery
inferior ulnar colateral artery
radial artery
ulnar artery

Question 15

describe the profunda brachii artery

Answer 15

passes between the long and medial head of triceps brachii to enter the lower triangular space and then goes to the spiral groove

Question 16

what is the site of the cubital fossa?

Answer 16

triangular fascial space in front of the elbow

Question 17

what are the boundaries of the cubital fossa?

Answer 17

medially is the pronator teres muscle
laterally is the brachioradiallis muscle
base is an imaginary line between the medial and lateral epicondyles of the humerus

Question 18

roof of the cubital fossa

Answer 18

superficial fascia which includes median and medial cubital veins
medial and lateral cutaneous nerve of the forearm
deep facia and bicipital aponeurosis

Question 19

floor of the cubital fossa

Answer 19

brachiallis medially and supinator

Question 20

what are the contents of the cubital fossa from median to lateral

Answer 20

median nerve
ending of brachial artery and beginning of the radial and ulnar arteries
radial nerve
biceps brachii tendon

Question 21

supra chondylar fracture of the humerus may lead to injury to brachial artery medial nerve and radial nerve