The document describes the anatomy of the arm, including cutaneous innervation, fascial compartments, contents of the anterior compartment, and structures passing through the anterior compartment. Specifically, it notes that the arm is divided into anterior and posterior compartments by intermuscular septa, with the anterior compartment containing the biceps brachii, coracobrachialis, and brachialis muscles innervated by the musculocutaneous nerve, as well as the brachial artery, median nerve, ulnar nerve, and other structures passing through.
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2. Cutaneous Innervation
• The upper medial surface of the arm is supplied by
the lateral branch of the second intercostal nerve (the
intercostobrachial nerve).
• The lower medial surface of the arm is supplied by
the medial cutaneous nerve of the arm.
• The lateral aspect of the arm is supplied by the upper
lateral cutaneous nerve (a branch of the axillary nerve)
and the lower lateral cutaneous nerve (a branch of the
radial nerve).
• The posterior aspect is supplied by the posterior
cutaneous nerve of the arm, a branch of the radial
nerve
3. Fascial Compartments of the Upper Arm
• The upper arm is enclosed in a sheath of deep fascia.
• Two fascial septa;
• medial intermuscular septum on the medial side
extend from this sheath and are attached to the
medial supracondylar ridge of the humerus
• lateral intermuscular septum on the lateral side,
extend from this sheath and are attached to the
lateral supracondylar ridge of the humerus.
• By this means, the upper arm is divided into an
anterior and a posterior fascial compartment, each
having its muscles, nerves, and arteries
4.
5. Contents of the anterior compartment
of the arm
• Muscles: Biceps brachii, coracobrachialis, and
brachialis
• Blood supply: Brachial artery
• Nerve supply to the muscles: Musculocutaneous
nerve
• Structures passing through the compartment:
Musculocutaneous, median, and ulnar nerves;
brachial artery and basilic vein.
• The radial nerve is present in the lower part of the
compartment.
6. Muscles of the Anterior Fascial
Compartment
• The biceps brachii.
• Coracobrachialis.
• Brachalis muscles.
7. Biceps brachii muscle
• Origin:
• Long head: from the supraglenoid tubercle of the scapula.
• Short head: from the tip of coracoid process of the scapula.
• Insertion: Into the posterior part of the tuberosity of the
radius.
The bicipital aponeurosis inserted into the deep fascia of the
upper part of the medial side of the forearm.
• Nerve Supply: From musculocutaneous nerve.
• Action:
• Supination of the forearm at the radio-ulnar joints.
• Flexion of the forearm at the elbow joint.
• Weak flexion of the shoulder joint.
8.
9. Coracobrachialis muscle
• Origin: From the tip of coracoid process of the
scapula (with short head of biceps).
• Insertion: Into the middle third of the medial side
of the shaft of the humerus.
• Blood Supply: Muscular branches of brachial
artery
• Nerve Supply: From musculocutaneous nerve.
• Action:
• Flexion of the shoulder joint.
• Weak adduction of the shoulder joint.
10.
11. Brachialis muscle
• Origin:
• From the lower half of the anterior surface of the
shaft of the humerus.
• Insertion: Into the anterior surface of the coronoid
process of the ulna.
• Nerve Supply:
• Majority of the muscle from musculocutaneous
nerve.
• Small lateral part from the radial nerve.
• Action: Strong flexion of the elbow joint.
12.
13. Structures Passing Through the Anterior
Fascial Compartment
• Brachial artery
• Musculocutaneos nerve
• Median nerve
• Ulnar nerve
14. Brachial Artery
• Beginning The brachial artery begins at the lower border of the teres
major muscle as a continuation of the axillary artery.
• It provides the main arterial supply to the arm.
• Termination It terminates opposite the neck of the radius by dividing into
the radial and ulnar arteries.
• Relations
• Anteriorly: The vessel is superficial and is overlapped from the lateral side
by the coracobrachialis and biceps. The medial cutaneous nerve of the
forearm lies in front of the upper part; the median nerve crosses its
middle part; and the bicipital aponeurosis crosses its lower part.
• Posteriorly: The artery lies on the triceps, the coracobrachialis insertion,
and the brachialis
• Medially: The ulnar nerve and the basilic vein in the upper part of the
arm; in the lower part of the arm, the median nerve lies on its medial side
• Laterally: The median nerve and the coracobrachialis and biceps muscles
above; the tendon of the biceps lies lateral to the artery in the lower part
of its course
15. Branches of brachial artery
• Muscular branches to the anterior compartment of
the upper arm
• The nutrient artery to the humerus
• The profunda artery arises near the beginning of the
brachial artery and follows the radial nerve into the
spiral groove of the humerus.
• It supplies muscular branches, the nutrient artery of
the humerus, and finally divides into terminal radial
and middle collateral branches.
• The superior ulnar collateral artery arises near the
middle of the upper arm and follows the ulnar nerve.
• The inferior ulnar collateral artery arises near the
termination of the artery and takes part in the
anastomosis around the elbow joint
16.
17. Musculocutaneous Nerve
• The origin of the musculocutaneous nerve from
the lateral cord of the brachial plexus
(C5, 6, and 7).
• It runs downward and laterally, pierces the
coracobrachialis muscle, and then passes
downward between the biceps and brachialis
muscles.
• It appears at the lateral margin of the biceps
tendon and pierces the deep fascia just above the
elbow.
• It runs down the lateral aspect of the forearm as
the lateral cutaneous nerve of the forearm
18.
19.
20. Branches of musculocutaneous nerve
• Muscular branches to the biceps,
coracobrachialis, and brachialis
• Cutaneous branches; the lateral cutaneous nerve
of the forearm supplies the skin of the front and
lateral aspects of the forearm down as far as the
root of the thumb.
• Articular branches to the elbow joint
21. Median Nerve
• The origin of the median nerve from the medial and
lateral cords of the brachial plexus in the axilla.
• It runs downward on the lateral side of the brachial
artery . Halfway down the upper arm, it crosses the
brachial artery and continues downward on its medial
side.
• The nerve, like the artery, is therefore superficial, but
at the elbow, it is crossed by the bicipital aponeurosis.
• The median nerve has no branches in the upper arm ,
except for a small vasomotor nerve to the brachial
artery.