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Terminal patterns of the tegmental afferents in the interpeduncular nucleus: a Golgi study in the mouse

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Abstract

The intranuclear course, distribution and termination of the tegmental afferents in the interpeduncular nucleus (IP) were studied in the mouse by means of the rapid Golgi method. Primarily on the basis of terminal branching patterns and distribution areas, two types of afferents were distinguished. The type 1 fibers distribute mainly within the rostral half in the form of numerous glomerular endings, the size of which corresponds well with that of the tufted terminal dendrites of the IP neurons. On the other hand, the caudal half of the IP has far fewer fibers than the rostral IP and is innervated by the type 2 fibers, which follow a tortuous course, terminating in dense fiber plexus. Thus, the rostral and caudal IP are innervated in a different fashion by different afferents originating from tegmental regions. These results are discussed in relation to the distribution patterns of another conspicuous afferent system of the IP, the fasciculus retroflexus.

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Abbreviations

TA (fibers):

afferents from the tegmentum

TA-1(fibers):

type 1 TA fibers

TA-2 (fibers):

type 2 TA fibers

DC:

dorsal cap

FI:

fossa interpeduncularis

FR:

fasciculus retroflexus

IP:

interpeduncular nucleus

IP-C (C):

central subnucleus of the IP

IP-DL (DL):

dorsal lateral subnucleus of the IP

IP-DM (DM):

dorsal medial subnucleus of the IP

IP-I (I):

intermediate subnucleus of the IP

IP-L (L):

lateral subnucleus of the IP

IP-R (R):

rostral subnucleus of the IP

IP-RL (RL):

rostral lateral subnucleus of the IP

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Authors and Affiliations

  1. Department of Anatomy, Faculty of Medicine, Nagasaki University, 852, Nagasaki, Japan

    Nobuharu Iwahori, Kaori Nakamura & Sanae Kameda

  2. Department of Physical Therapy, School of Allied Medical Sciences, Nagasaki University, 852, Nagasaki, Japan

    Hiroyuki Tahara

Authors
  1. Nobuharu Iwahori
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  2. Kaori Nakamura
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  3. Sanae Kameda
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  4. Hiroyuki Tahara
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Iwahori, N., Nakamura, K., Kameda, S. et al. Terminal patterns of the tegmental afferents in the interpeduncular nucleus: a Golgi study in the mouse. Anat Embryol 188, 593–599 (1993). https://doi.org/10.1007/BF00187015

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