CranNrvSheet-Brief-11

CranNrvSheet-Brief-11 - BIBB310-601 Fall 2011 CRANIAL...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
BIBB310-601 Fall 2011 CRANIAL NERVES Functional Types of Axons Nomenclature . All peripheral nerves (either spinal nerves or cranial nerves) contain axons with at least one functional type of axon and many contain several functional types. Functional categories of axons are usually designated by letter acronyms, for example, GSA or SA. The last letter of the acronym is always an 'A' or an 'E' . The 'A' always stands for afferent (or sensory) axons that carry impulses from somatic or visceral structures to the central nervous system (CNS). The 'E' always stands for efferent (or motor) axons that carry impulses away from the CNS to somatic or visceral structures. The first letter of the acronym is always a 'G' or an 'S' . The 'G' stands for general functional axons found in both spinal nerves and some cranial nerves. The 'S' stands for special functional axons found only in certain cranial nerves. Special functional axons may be either afferents from the special senses (sight, hearing, balance, olfaction, taste), or efferents to special muscles (those derived embryonically from the branchial arches – branchiomeric muscle). The middle letter (when present) of the acronym is always a 'V' or an 'S' . The 'S' stands for somatic and the 'V' stands for visceral. 'Visceral' is used in a very broad sense to mean, basically, autonomic
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

CranNrvSheet-Brief-11 - BIBB310-601 Fall 2011 CRANIAL...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online