The first spinal nerve, the suboccipital nerve exits the spinal cord between the skull and the first cervical vertebra, the atlas. It supplies muscles around the suboccipital triangle including the rectus capitis posterior major, obliquus capitis superior, and obliquus capitis inferior.
The optic nerve passes through the optic foramen in the skull into the orbit, where it is penetrated by the central artery of the retina, and eventually pierces the scelerotic just internal to the posterior pole of the eyeball.
Between the two ganglia the accessory part of the eleventh nerve joins the tenth, and it is from this communication that the motor twigs to the pharynx, larynx, alimentary and respiratory tracts are derived, as well as the inhibitory fibres of the heart.
The anterior tibial nerve is chiefly muscular, innervating the muscles in front of the tibia and fibula as well as the extensor brevis digitorum pedis on the dorsum of the foot, though it gives one small cutaneous branch to the cleft between the first and second toes.
The first nerve off the brachial plexus is the dorsal scapular nerve[?], arising from C5 nerve root, and innervating the rhomboids[?] and the levator scapulae[?] muscles.
The suprascapular nerve[?] is an early branch of the superior trunk.
The radial nerve, which innervates the triceps brachii[?] muscle, the brachioradialis muscle, the extensor muscles of the fingers and wrist(extensor carpi radialis[?] muscle), and the externsor and abductor muscles of the thumb.
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