What does cr. nn. mean in Medical?

This page is about the meanings of the acronym/abbreviation/shorthand cr. nn. in the field in general and in the Medical terminology in particular.

cranial nerves

Medical

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Definition

What does cr. nn. mean?

Cranial nerves
Cranial nerves, are nerves that emerge directly from the brain and the brainstem, in contrast to spinal nerves. Information is exchanged between the brain and various regions, primarily of the head and neck, via the cranial nerves. Spinal nerves reach as far as the first cervical vertebra, and the cranial nerves fill a corresponding role above this level. Each cranial nerve is paired and is present on both sides. Depending on source there are in humans twelve or thirteen pairs of cranial nerves, which are assigned Roman numerals I-XII, and zero assigned to cranial nerve zero, according to the order in which they originate from the forebrain to the back of the brain and the brainstem. The terminal nerves, olfactory nerves and optic nerves emerge from the cerebrum or forebrain, and the remaining ten pairs emerge from the brainstem. The cranial nerves are components of the peripheral nervous system, with the exception of cranial nerve II, which is not a true peripheral nerve but a neural tract of the diencephalon connecting the retina with the lateral geniculate nucleus; hence both the optic nerve and the retina are part of the central nervous system.

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