Fig. 3. TH+ axons along the AN. (A) shows a cross section of the AN labeled for TH and counterstained with neurotrace red (NT). This section is taken from the AN distal to receiving branches from the ICP (boxed area in B). A higher magnification view of the main trunk of the AN is (C); there is no TH immunolabeling in this part of the nerve. A higher magnification view of the peripheral aspect of the nerve is (D); the majority of these axons are TH+, consistent with noradrenergic function. The scale bar in A is equal to 200 mm; the scale bar in D is equal to 40 mm and applies to both C and D. AN, abducens nerve; S, superior; R, rostral; ICP, internal carotid sympathetic plexus.
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