Cutaneous Innervation (dermatomes)

Question 1

Lateral aspect of upper limb is innervated more by what segment of spinal cord?

Answer 1

the cranial spinal cord segment

Question 2

Describe dermatomes of upper limb
(Foerster)
Look at gallery faves (First two)

Answer 2

Neck area-c3
Medial Shoulder area-c4
Medial Arm area- c5
Medial Forearm and 1st and half of 2nd digit- c6
1/2 of 2nd, 3rd and 1/2 of 4th digit and middle forearm- c7
Half of 4th and 5th digit and medial forearm- c8
Half of medial arm- T1
Other half of medial arm and armpit region-T2
T3 and T4 and so on continue in an ascending ladder order

Question 3

Dermatomes of upper limb
(Keegan and garret)

Answer 3

Abeg just look at your gallery favorites. Last two
Just know that this is simpler
And anteriorly there are more dermatomes than posteriorly

Question 4

Peripheral nerves of upper limb

Answer 4

Axillary nerve - c5 and c6
Deltoid and teres MINOR

Musculocutaneous nerve - c5-c7
Anterior compartment of arm, lateral CUTANEOUS innervation of forearm and adjacent skin.

Median nerve - c5-T1
Half of anterior forearm, half of PALMER thumb muscles, lateral two lumbrical muscles, CUTANEOUS innervation to 3.5 palmarside digits of nail beds and adjacent skin

Ulnar nerve- c7-T1
Flexor carpi ulnaris (only in forearm), medial half of digitorum profundus of ant. Compartment in hand, muscles of small finger, medial two lumbricals, adductor pollicis and deep head of flexor pollicis brevis m, CUTANEOUS innervation of PALMER and DORSAL 1.5(medially) and to adjacent skin.

Radial nerve-c5-T1
All muscles of POSTERIOR compartments of arm and forearm
Skin of dorsum of hand and base of thumb.