Provides the following important functions: (1) sensory innervation to the skin & deep structures; (2) motor innervation to muscles; (3) influence over diameter of blood vessels by sympatetic vasomotor nerves; (4) sympathetic secretomotor supply to the sweat glands.
31 pairs of spinal nerves
are attached to the spinal
Each spinal nerve divides
into a dorsal and ventral
ramus. 3Cleyson Mupfiga HUB117 2011
The brachial plexus is a network of nerves
formed by the union of the anterior rami
(branches) of C5 – C8 & T1 spinal nerves.
It originates in the neck, passes laterally &
inferiorly over the first rib & enters the axilla
All major nerves of the upper limb originate
from parts of the brachial plexus.
Divided into ROOTS, TRUNKS, DIVISIONS,
and CORDS. BRANCHES emerge to supply the
4Cleyson Mupfiga HUB117 2011
Lateral Cervical Region
Robert Trucker Drinks Cold Beer
Roots (ventral rami):
nerves of the arm
Nerve to subclavius
(a) Roots (rami C5 – T1), trunks, divisions, and cords
Brachial Plexus Injuries
16Cleyson Mupfiga HUB117 2011
Upper brachial plexus
injuries: “waiter’s tip
Lower brachial plexus
injuries: short muscles of
the hand are affected >
Anaethesia: loss of sensation; may
be pathological or induced to facilitate
surgery or other medical treatment.
Paraesthesia: abnormal sensation
e.g. tingling or burning.
Cleyson Mupfiga HUB117 2011