Abstract
There is considerable confusion in the literature regarding the nature of the musculature of the avian iris. The most commonly held view is that both the sphincter and dilator are striated. The iris of the Great Horned Owl (Bubo virginianus) has a complex iridial musculature consisting of three circumferential components (a myoepithelium, smooth muscle and striated muscle) and two radial components (a well-developed myoepithelium and a few striated fibers). On the basis of the anatomy and relative development of these components, and a quantitative analysis of the pupillary reflex, it is proposed that the circumferential striated muscle is the primary pupillary constrictor and radial myoepithelium is the primary dilator. The annular band of smooth muscle may play an important role in maintaining pupillary size.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 583-595 |
| Number of pages | 13 |
| Journal | Experimental Eye Research |
| Volume | 37 |
| Issue number | 6 |
| DOIs | |
| State | Published - 1983 |
| Externally published | Yes |
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Keywords
- avian iris
- myoepithelium
- pupillography
- smooth muscle
- striated muscle
ASJC Scopus subject areas
- Ophthalmology
- Sensory Systems
Cite this
The musculature and pupillary response of the Great Horned Owl iris. / Oliphant, Lynn W.; Johnson, Mark R.; Murphy, Christopher J; Howland, Howard.
In: Experimental Eye Research, Vol. 37, No. 6, 1983, p. 583-595.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The musculature and pupillary response of the Great Horned Owl iris
AU - Oliphant, Lynn W.
AU - Johnson, Mark R.
AU - Murphy, Christopher J
AU - Howland, Howard
PY - 1983
Y1 - 1983
N2 - There is considerable confusion in the literature regarding the nature of the musculature of the avian iris. The most commonly held view is that both the sphincter and dilator are striated. The iris of the Great Horned Owl (Bubo virginianus) has a complex iridial musculature consisting of three circumferential components (a myoepithelium, smooth muscle and striated muscle) and two radial components (a well-developed myoepithelium and a few striated fibers). On the basis of the anatomy and relative development of these components, and a quantitative analysis of the pupillary reflex, it is proposed that the circumferential striated muscle is the primary pupillary constrictor and radial myoepithelium is the primary dilator. The annular band of smooth muscle may play an important role in maintaining pupillary size.
AB - There is considerable confusion in the literature regarding the nature of the musculature of the avian iris. The most commonly held view is that both the sphincter and dilator are striated. The iris of the Great Horned Owl (Bubo virginianus) has a complex iridial musculature consisting of three circumferential components (a myoepithelium, smooth muscle and striated muscle) and two radial components (a well-developed myoepithelium and a few striated fibers). On the basis of the anatomy and relative development of these components, and a quantitative analysis of the pupillary reflex, it is proposed that the circumferential striated muscle is the primary pupillary constrictor and radial myoepithelium is the primary dilator. The annular band of smooth muscle may play an important role in maintaining pupillary size.
KW - avian iris
KW - myoepithelium
KW - pupillography
KW - smooth muscle
KW - striated muscle
UR - http://www.scopus.com/inward/record.url?scp=0021049672&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0021049672&partnerID=8YFLogxK
U2 - 10.1016/0014-4835(83)90134-3
DO - 10.1016/0014-4835(83)90134-3
M3 - Article
C2 - 6662207
AN - SCOPUS:0021049672
VL - 37
SP - 583
EP - 595
JO - Experimental Eye Research
JF - Experimental Eye Research
SN - 0014-4835
IS - 6
ER -