CHAPTER -5

FRONT OF ARM

Muscles:

Biceps brachii:

Origin:

Two heads:

Long head from supraglenoid tubercle of scapula

Short head from the tip of coracoid process

Insertion:

Biceps tendon is inserted into the radial tuberosity and the aponeurosis is inserted in to the posterior border of ulna


Nerve supply:

Musculocutaneous  nerve

Actions:

Flexion of elbow joint

Supination of forearm

Coracobrachialis:

Origin:

From the tip of the coracoid process along with the short head of biceps brachii

Insertion:

Inserted in to the middle of the shaft of humerus

Nerve supply:

Musculocutaneous  nerve

Actions:

Flexion of shoulder joint

Brachialis:

Origin:

FF From the anterior surface of the shaft of humerus

Insertion:

Inserted in to the tuberosity of the ulna

Nerve supply:

Dual nerve supply: Musculocutaneous  nerve and radial nerve

Actions:

Flexion of elbow joint

FOR QUESTIONS ON THE FRONT OF ARM MUSCLES IN THE PRACTICALS- WATCH THIS VIDEO;  https://youtu.be/Z4U6FCEqlz4

BRACHIAL ARTERY:

Origin : it is the continuation of axillary artery

Extent : from the lower border of teres major to the neck of radius

Course :

  • The artery is at first medial to the humerus and then to the front of the bone
  • It appears in the cubital fossa as its content

  Relations

Behind : (from above downwards)

Long head of triceps

Medial head of triceps

Brachialis

In front :

Median nerve crosses the artery in the middle arm

In the cubital fossa, crossed by bicipital aponeurosis

Laterally:

Median nerve in upper part

Biceps brachii tendon in lower part

Medially:

Medial cutaneous nerve of forearm and ulnar nerve in upper part

Median nerve in lower part

Branches of brachial artery:

Profunda brachii artery : 

Large branch of brachial artery and it follows the radial nerve in the spiral groove.

Superior ulnar collateral artery

Inferior ulnar collateral artery

Nutrient artery to humerus

Applied anatomy :

Pulsation of brachial artery is auscultated in front of elbow which is the standard method to record blood pressure.

FOR DISSECTION OF FRONT OF ARM, WATCH THIS VIDEO: 

https://youtu.be/Ew-Rt6Vx6f4

MUSCULOCUTANEOUS NERVE:

  • Nerve of the anterior compartment of the arm
  • Branch of lateral cord of brachial plexus
  • Root value is C5,C6,C7
  • It pierces the coracobrachialis and supplies the muscles
  • It descends between the biceps brachii and the coracobrachialis and gives branches to the two muscles
  • Then, below the level of elbow joint, it continues as the lateral cutaneous nerve of forearm- so only called as musculocutaneous nerve

 

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