The brachial plexus is a complex nerve network that starts around C5 and then goes down
through C6, C7, C8, and T1 levels. The C5 and C6 nerve roots come together to form a trunk,
which is where the upper trunk splits into an anterior and posterior division. The middle trunk
also splits into an anterior division. The C7 root feeds into its own trunk, while the C8 and T1
root come together to form their trunk. The posterior cord is formed by the posterior division
of the upper, middle, and lower trunk, and then branches out into the axillary and radial
nerves. The anterior division supplies the ulnar nerve, forming its own chord. Additionally, the
muscular cutaneous nerve branches off from the mar mu m root, while the axillary and radial
nerves branch off from the posterior cord. The ulnar nerve supplies the own r bone, which is
located on the pinky side, while the anterior and posterior divisions combine to form special
chords that branch off into different nerves.
The median nerve is formed by branches of both the medial and the lateral cord, which
originates from c5 and then picks up a branch from c6 before running down. The long
thoracic nerve is crucial as it supplies the serratus anterior muscle, which helps to protract
the scapula. The dorsal scapular nerve supplies two muscles, including the rhomboids, while
the lower subscapular nerve gives off two branches. The thoracodorsal nerve goes to the
latissimus dorsi, while the teres major performs the same functions as the Taurus muscle,
including extension, adduction, and medial rotation at the shoulder joint. The suprascapular
nerve is one of the branches that come off the posterior cord, while the lateral cord has a
branch that supplies the subclavius muscle. Additionally, the posterior cord has three
branches that supply the lateral pectoralis major, and the anterior cord has several branches
that go towards the lateral cords. The medial brachial cutaneous nerve supplies the
posterior and medial surface of the brachial region, and has three branches: the medial
brachial cutaneous, the medial antebrachial cutaneous, and the lateral brachial cutaneous.
Finally, the medial pectoralis minor nerve is specific for protraction of the scapula.
The musca cutaneous nerve has two branches, a cutaneous branch and a motor branch. The
motor branch supplies three muscles: the coracobrachialis, the brachialis, and the biceps
brachii (both the short and long head). In addition, the radial nerve supplies the muscles of
the posterior arm, including the triceps brachii, which plays a role in extension at the elbow
joint and supplies almost all of the extensor compartment of the forearm. The motor branch
of the radial nerve also supplies the deltoid and teres minor muscles. The deltoid has three
functions: abduction at the shoulder joint, flexion at the shoulder joint, and extension of the
shoulder. The teres minor plays a role in lateral rotation or external rotation of the shoulder
joint. The radial nerve also supplies the polaris muscle, which is another word for the thumb.
The musca cutaneous nerve's cutaneous branch supplies a patch of skin on the posterior
and lateral surface of the deltoid. The median nerve is responsible for several functions, and
it is challenging to work with. However, it also has motor branches that supply the extensor
carpi ulnaris muscle.
The motor branch hair supplies a lot of muscle hair, including the thenar muscles which are
mostly supplied by the median nerve. However, the ulnar nerve gives off a branch that flies
over and supplies the adductor pollicis brevis, while the flexor carpi ulnaris muscle is
supplied by the motor branch. When compressed, the ulnar nerve can also cause carpal
tunnel syndrome, which runs underneath the transverse carpal ligament. The cutaneous
branch is also involved in supplying muscle hair and can help with muscles such as the
palmaris longus, palm palmic muscle, and flexor carpi radialis. The ulnar nerve supplies the
ventral and dorsal one-third of the hand, while the median nerve supplies the other two-
thirds. Finally, the abductor digiti minimi muscle is supplied by the ulnar nerve.
through C6, C7, C8, and T1 levels. The C5 and C6 nerve roots come together to form a trunk,
which is where the upper trunk splits into an anterior and posterior division. The middle trunk
also splits into an anterior division. The C7 root feeds into its own trunk, while the C8 and T1
root come together to form their trunk. The posterior cord is formed by the posterior division
of the upper, middle, and lower trunk, and then branches out into the axillary and radial
nerves. The anterior division supplies the ulnar nerve, forming its own chord. Additionally, the
muscular cutaneous nerve branches off from the mar mu m root, while the axillary and radial
nerves branch off from the posterior cord. The ulnar nerve supplies the own r bone, which is
located on the pinky side, while the anterior and posterior divisions combine to form special
chords that branch off into different nerves.
The median nerve is formed by branches of both the medial and the lateral cord, which
originates from c5 and then picks up a branch from c6 before running down. The long
thoracic nerve is crucial as it supplies the serratus anterior muscle, which helps to protract
the scapula. The dorsal scapular nerve supplies two muscles, including the rhomboids, while
the lower subscapular nerve gives off two branches. The thoracodorsal nerve goes to the
latissimus dorsi, while the teres major performs the same functions as the Taurus muscle,
including extension, adduction, and medial rotation at the shoulder joint. The suprascapular
nerve is one of the branches that come off the posterior cord, while the lateral cord has a
branch that supplies the subclavius muscle. Additionally, the posterior cord has three
branches that supply the lateral pectoralis major, and the anterior cord has several branches
that go towards the lateral cords. The medial brachial cutaneous nerve supplies the
posterior and medial surface of the brachial region, and has three branches: the medial
brachial cutaneous, the medial antebrachial cutaneous, and the lateral brachial cutaneous.
Finally, the medial pectoralis minor nerve is specific for protraction of the scapula.
The musca cutaneous nerve has two branches, a cutaneous branch and a motor branch. The
motor branch supplies three muscles: the coracobrachialis, the brachialis, and the biceps
brachii (both the short and long head). In addition, the radial nerve supplies the muscles of
the posterior arm, including the triceps brachii, which plays a role in extension at the elbow
joint and supplies almost all of the extensor compartment of the forearm. The motor branch
of the radial nerve also supplies the deltoid and teres minor muscles. The deltoid has three
functions: abduction at the shoulder joint, flexion at the shoulder joint, and extension of the
shoulder. The teres minor plays a role in lateral rotation or external rotation of the shoulder
joint. The radial nerve also supplies the polaris muscle, which is another word for the thumb.
The musca cutaneous nerve's cutaneous branch supplies a patch of skin on the posterior
and lateral surface of the deltoid. The median nerve is responsible for several functions, and
it is challenging to work with. However, it also has motor branches that supply the extensor
carpi ulnaris muscle.
The motor branch hair supplies a lot of muscle hair, including the thenar muscles which are
mostly supplied by the median nerve. However, the ulnar nerve gives off a branch that flies
over and supplies the adductor pollicis brevis, while the flexor carpi ulnaris muscle is
supplied by the motor branch. When compressed, the ulnar nerve can also cause carpal
tunnel syndrome, which runs underneath the transverse carpal ligament. The cutaneous
branch is also involved in supplying muscle hair and can help with muscles such as the
palmaris longus, palm palmic muscle, and flexor carpi radialis. The ulnar nerve supplies the
ventral and dorsal one-third of the hand, while the median nerve supplies the other two-
thirds. Finally, the abductor digiti minimi muscle is supplied by the ulnar nerve.
