Anatomy Exam 2: Blood Supply and Nerves

The Upper Limb and Pelvis

What are the three cords of the brachial plexus?

The posterior, medial, and lateral cords.

What are the posterior compartment terminal branches of the brachial plexus?

The axillary and radial nerves.

What are the anterior compartment terminal branches of the brachial plexus?

The musculocutaneous, ulnar, and median nerves.

What levels of the spinal cord does the brachial plexus originate from?

C5-T1

What innervates the shoulder muscles?

Brachial plexus and axillary nerve

What innervates the anterior compartment of the arm?

Musculocutaneous nerve

What innervates the posterior compartment of the arm and forearm?

Radial nerve

What innervates the anterior compartment of the forearm as well as the three thenar muscles?

Median nerve

What innervates all other intrinsic hand muscles not including the three thenar muscles

Ulnar nerve

What supplies blood to the anterior compartment of the arm and shoulder?

Brachial artery

What supplies blood to the posterior compartment of the arm and shoulder?

Deep brachial artery

What supplies blood to the forearm and hand?

Ulnar and radial arteries in the forearm, palmar arterial arches in the hand

What are the three superficial veins of the upper limb?

Basilic, cephalic, median cubital

Track the flow of blow from the upper limb back to the heart

Axillary vein —> subclavian vein —> brachiocephalic vein —> SVC —> heart

What veins are in the hand?

Palmar arches

In what direction do veins of the arm drain?

Deep to superficial

What injury causes Erb’s Palsy, where does that injury affect, and what are the symptoms?

Forceful lateral flexion of neck (fall on head/neck, pulling baby’s shoulders during delivery), brachial plexus C5-C6, upper limb hangs limply at side, forearm pronated

What injury causes Klumpke Syndrome, where does that injury affect, and what are the symptoms?

Strong upward traction on the upper limb (hanging, pulling baby’s arms during delivery), lower brachial plexus C8-T1, loss of most hand muscles and flexion of digits