504
UNIT 3
Regulation and Integration of the Body
13
Median
nerve
Musculo-
cutaneous
nerve
Radial
nerve
Humerus
Ulna
Ulnar nerve
Median
nerve
Radius
Radial nerve
(superficial
branch)
Superficial branch
of ulnar nerve
Dorsal branch
of ulnar nerve
Digital branch
of ulnar nerve
Muscular
branch
Digital
branch
(c) The major nerves of the upper limb
Upper
Middle
Trunks
Lower
C
4
Roots (ventral rami):
C
5
C
6
C
7
C
8
T
1
Upper subscapular
Lower subscapular
Thoracodorsal
Medial cutaneous
nerves of the arm
and forearm
Long thoracic
Axillary nerve
Medial pectoral
Lateral pectoral
(a) Roots (rami C
5
–T
1
), trunks, divisions, and cords
Nerve to
subclavius
Suprascapular
Dorsal scapular
Posterior
divisions
Anterior
divisions
Lateral
Posterior
Cords
Medial
Axillary
Musculo-
cutaneous
Radial
Median
Ulnar
Posterior
divisions
Trunks
Roots
(b) Flowchart summarizing relationships within the brachial plexus
Major terminal
branches
(peripheral nerves)
Cords
Divisions
Trunks
Roots
(ventral
rami)
Musculocutaneous
Median
Ulnar
Radial
Axillary
C
5
C
6
C
7
C
8
T
1
Anterior
Posterior
Anterior
Posterior
Posterior
Anterior
Upper
Middle
Lower
Lateral
Medial
Posterior
(d) Cadaver photo
Musculocutaneous
nerve
Lateral cord
Medial cord
Posterior cord
Axillary nerve
Median nerve
Radial nerve
Ulnar nerve
Figure 13.10
The brachial plexus.
(Anterior view.)
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