It is innervated by the ventral branches of the cervical spinal nerves. It has no olfactory nerves or olfactory lobe in the brain. Inflammation may also affect other cranial nerves. Half his skeleton was there, half his nerves and muscles. Cranial neuritis is an inflammation of cranial nerves. This causes hyperexcitation of contaminated insects' nerves and muscles. The pericardiacophrenic arteries and veins travel with their respective phrenic nerves. It originates from the lateral cord of the brachial plexus of nerves. Dry beriberi causes wasting and partial paralysis resulting from damaged peripheral nerves. It is innervated by the cranial pectoral nerves. VZV then remains latent in the dorsal ganglion cells of the sensory nerves. They are innervated by the fourth, fifth, and sixth cervical spinal nerves (C4-C6). Ten pairs of cranial nerves come from the brainstem. Examination of the sternocleidomastoid muscle forms part of the examination of the cranial nerves. It is derived from spinal nerves L4 to S3.