|..... Nerve point of the neck: is the region around the midpoint of the posterior border of the sternocleidomastoid muscle. Several nerves lie superficially here, deep to the platysma. This point is important because:-
Brachial plexus block . Local anaesthetic solution is injected around the brachial plexus, superior to the midpoint of the clavicle. Be careful to locate the subclavian artery by palpation so it is not damaged.
Subclavian artery, can be pressed in the suprascapular fossa, to control bleeding in the upper limb.
Block dessection, is sometimes done in this region for the removal of lymph nodes. The accessory and Phrenic nerves, together with the other structures should be saved.
Safe/ danger sides. The accessory nerve may be used to divide the posterior triangle into a carefree area superiorly and a danger area inferiorly, which has major nerves and blood vessels
Investing Fascia: Forms a tight sheath for the glands especially the parotid, restricting swelling. Iinflammation of this glands causes pain due to high pressure.
The retropharyngeal space between pharynx and pre-vertebral fascia is clinically important because it frequently becomes infected secondary to upper respiratory tract infrections in childhood. The swelling appears on one side of the posterior pharyngeal wall and may obstruct the airway. In adults such infections are usually secondary to tuberculosis of the cervical vertebral column.
External Jugular Vein is relatively superficial therefore:
........ It pierces investing fascia therefore, when lacerated