Abstract
The recurrent laryngeal nerve (RLN) branches from the vagus cranial nerve to innervate structures important for voicing and swallowing. Damage to this nerve, commonly associated with surgery or idiopathic etiologies that largely occur with aging, results in impaired voicing and swallowing (Myssiorek, 2004). Sunderland proposed a model of peripheral nerve damage whereby a nerve's ability to resist damage from stretch and compression is determined by the quantity and composition of its epineurial connective tissues (Sunderland, 1951). Thus, it would be expected that epineurium differs depending upon the forces imposed on a nerve within its anatomical setting. The purpose of this study was to investigate RLN epineurium quantity and composition with development. A porcine model (piglet vs. juvenile) was used because of the similarity between porcine and human laryngeal innervation, anatomy and function. The entire RLN was excised bilaterally, and stereological methods were used to quantify the composition of epineurial connective tissues. Compared with the piglet, the juvenile pig RLN was double the diameter. While the piglet had no differences in the percentage of epineurial collagen and adipose between proximal and distal segments of both sides of the RLN, the juvenile pig had a greater percentage of collagen in the proximal segment of both sides of the RLN and a greater percentage of adipose in the distal segment of the left RLN compared with the proximal segment. In addition, unlike the piglet, the juvenile pig had a greater number of fascicles in the proximal than distal segment of the RLN, regardless of nerve side. These findings are consistent with predicted patterns associated with the different anatomical settings of the left and right RLN, show that the RLN changes with age, and support Sunderland's model.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 625-633 |
| Number of pages | 9 |
| Journal | Journal of Anatomy |
| Volume | 222 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 2013 |
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Keywords
- Epineurium
- Neuroanatomy
- Porcine
- Recurrent laryngeal nerve
ASJC Scopus subject areas
- Anatomy
- Histology
- Developmental Biology
- Ecology, Evolution, Behavior and Systematics
- Molecular Biology
- Cell Biology
Cite this
Developmental changes in the connective tissues of the porcine recurrent laryngeal nerve. / Campbell, Ellen O.; Samlan, Robin A.; Mcmullen, Nathaniel T.; Cook, Sarah; Smiley-Jewell, Suzette; Barkmeier-Kraemer, Julie.
In: Journal of Anatomy, Vol. 222, No. 6, 06.2013, p. 625-633.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Developmental changes in the connective tissues of the porcine recurrent laryngeal nerve
AU - Campbell, Ellen O.
AU - Samlan, Robin A.
AU - Mcmullen, Nathaniel T.
AU - Cook, Sarah
AU - Smiley-Jewell, Suzette
AU - Barkmeier-Kraemer, Julie
PY - 2013/6
Y1 - 2013/6
N2 - The recurrent laryngeal nerve (RLN) branches from the vagus cranial nerve to innervate structures important for voicing and swallowing. Damage to this nerve, commonly associated with surgery or idiopathic etiologies that largely occur with aging, results in impaired voicing and swallowing (Myssiorek, 2004). Sunderland proposed a model of peripheral nerve damage whereby a nerve's ability to resist damage from stretch and compression is determined by the quantity and composition of its epineurial connective tissues (Sunderland, 1951). Thus, it would be expected that epineurium differs depending upon the forces imposed on a nerve within its anatomical setting. The purpose of this study was to investigate RLN epineurium quantity and composition with development. A porcine model (piglet vs. juvenile) was used because of the similarity between porcine and human laryngeal innervation, anatomy and function. The entire RLN was excised bilaterally, and stereological methods were used to quantify the composition of epineurial connective tissues. Compared with the piglet, the juvenile pig RLN was double the diameter. While the piglet had no differences in the percentage of epineurial collagen and adipose between proximal and distal segments of both sides of the RLN, the juvenile pig had a greater percentage of collagen in the proximal segment of both sides of the RLN and a greater percentage of adipose in the distal segment of the left RLN compared with the proximal segment. In addition, unlike the piglet, the juvenile pig had a greater number of fascicles in the proximal than distal segment of the RLN, regardless of nerve side. These findings are consistent with predicted patterns associated with the different anatomical settings of the left and right RLN, show that the RLN changes with age, and support Sunderland's model.
AB - The recurrent laryngeal nerve (RLN) branches from the vagus cranial nerve to innervate structures important for voicing and swallowing. Damage to this nerve, commonly associated with surgery or idiopathic etiologies that largely occur with aging, results in impaired voicing and swallowing (Myssiorek, 2004). Sunderland proposed a model of peripheral nerve damage whereby a nerve's ability to resist damage from stretch and compression is determined by the quantity and composition of its epineurial connective tissues (Sunderland, 1951). Thus, it would be expected that epineurium differs depending upon the forces imposed on a nerve within its anatomical setting. The purpose of this study was to investigate RLN epineurium quantity and composition with development. A porcine model (piglet vs. juvenile) was used because of the similarity between porcine and human laryngeal innervation, anatomy and function. The entire RLN was excised bilaterally, and stereological methods were used to quantify the composition of epineurial connective tissues. Compared with the piglet, the juvenile pig RLN was double the diameter. While the piglet had no differences in the percentage of epineurial collagen and adipose between proximal and distal segments of both sides of the RLN, the juvenile pig had a greater percentage of collagen in the proximal segment of both sides of the RLN and a greater percentage of adipose in the distal segment of the left RLN compared with the proximal segment. In addition, unlike the piglet, the juvenile pig had a greater number of fascicles in the proximal than distal segment of the RLN, regardless of nerve side. These findings are consistent with predicted patterns associated with the different anatomical settings of the left and right RLN, show that the RLN changes with age, and support Sunderland's model.
KW - Epineurium
KW - Neuroanatomy
KW - Porcine
KW - Recurrent laryngeal nerve
UR - http://www.scopus.com/inward/record.url?scp=84878107478&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84878107478&partnerID=8YFLogxK
U2 - 10.1111/joa.12046
DO - 10.1111/joa.12046
M3 - Article
VL - 222
SP - 625
EP - 633
JO - Journal of Anatomy
JF - Journal of Anatomy
SN - 0021-8782
IS - 6
ER -