Fascia around nerve bundle of brachial plexus is derived from:
The preveebral fascia forms a tubular sheath around the veebral column and the preveebral muscles, which are attached to the veebral column. It,Attaches superiorly from the base of the skull and inferiorly to the endothoracic fascia in the thorax.Extends laterally as the axillary sheath, which surrounds the axillary vessels and brachial plexus of nerves to the upper limb.Contains, within its connective tissue fibers, the cervical sympathetic trunk and ganglia.Ref: Moon D.A., Foreman K.B., Albeine K.H. (2011). Chapter 25. Overview of the Neck. In D.A. Moon, K.B. Foreman, K.H. Albeine (Eds), The Big Picture: Gross Anatomy.
Preveebral fascia
Clavipectoral fascia
Deep cervical fascia
Pectoral fascia