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Sensory Maps - Upper Extremity
Upper Extremity Sensory Maps
Upper Arm & Forearm
I.
Ulnar nerve
Covers the medial one third of the hand and the medial-half of the fourth digit and the fifth digit on both the dorsal and palmar sufaces.
II.
Radial nerve
Covers the lateral two-thirds of the dorsal hand and the proximal aspect of the 1st through 3rd and lateral 4th digits.
Its coverage extends to the lateral proximal palmar thumb.
III.
Median nerve
Completes the dorsal distal finger sensory coverage.
It covers the bulk of the palmar hand and fingers.
We square off the ball of the thumb, and show that a special branch of the median nerve (the palmar cutaneous nerve) covers this region.
clinical highlights of the sensory maps of the upper limb
The
palmar cutaneous nerve
is selectively spared in carpal tunnel syndrome.
The medial cutaneous nerves of the
forearm
and
arm
cover the medial forearm and arm.
The
intercostobrachial nerve
covers the axilla.
The
musculocutaneous nerve
covers the lateral forearm.
The
radial nerve
covers the lower lateral upper arm.
The
axillary nerve
covers the upper lateral arm.
The
supraclavicular nerve
covers the shoulder.
The
radial nerve
covers the midline forearm and arm.
sensory coverage of the hand
I.
Median nerve
Sensory coverage is from median nerve digital sensory branches.
II.
Radial nerve
Sensory coverage to the hand comes from the
superficial sensory radial nerve
.
III.
Dorsal ulnar
sensory coverage
Comes from the
dorsal ulnar cutaneous nerve
.
IV.
Palmar ulnar
sensory coverage
Divides at the hypothenar eminence into the
palmar ulnar cutaneous nerve
, proximally, and the superficial sensory division, distally.
Advanced Topics
I.
Musculocutaneous nerve
Covers the lateral forearm via the lateral cutaneous nerve of the forearm.
II.
Radial nerve
Covers the lower lateral upper arm via the lower lateral cutaneous nerve of the arm and the posterior midline forearm and arm via the posterior cutaneous nerves to the forearm and arm.
III.
Axillary nerve
Covers the upper lateral arm via the upper lateral cutaneous nerve of the arm.
IV.
Supraclavicular nerve
Covers the shoulder via specific anatomic branches.
V. Medial cutaneous nerves of the
forearm
and
arm
Supplied by the
medial cord
of the brachial plexus and cover the medial forearm and arm.
V.
Intercostobrachial nerve
Supplied by T2 and covers the axilla.
Related Tutorials
Upper Extremity - Sensory Maps
Lower Extremity - Sensory Maps