Neurological Sciences and Neurophysiology
Research Article

A study of the Structure of Mesencephalic Trigeminal Nucleus (Mes V) in the Rabbit


Department of Anatomy, Faculty of Basic Medical Sciences, College of Health Sciences, Niger Delta University, Wilberforce Island, Bayelsa state, Nijerya

Neurol Sci Neurophysiol 2014; 31: 310-315
Read: 42 Downloads: 8 Published: 03 September 2019


Background: There is drought of information on the morphometric characteristics of mesencephalic trigeminal nucleus (Mes V) of the rabbit. Hence, the purpose of this study was to determine some fundamental morphologic parameters of the mesencephalic trigeminal nucleus (Mes V) in the adult rabbit.


Methods: Brains were isolated after intracardial perfusion and were sectioned at 30µm in the coronal and horizontal planes with a freezing microtome and stained with the Bielschowsky’s method of silver impregnation. Results: It was observed that the Mes V nucleus commenced from the ventral region of the optic tectum to the mid-pons, running along the fourth ventricle and cerebral aqueduct outside the periaqueductal grey. The two Mes V nuclei contain about 1400 neurons. These neurons were mostly pseudounipolar consisting mainly of types “A” (35 -56 μm) and “B” (20-25 μm). Also present were a number of spindles and multipolar neurons.


Conclusions: The comparatively high number of neurons in the rabbit’s Mes V nucleus may be due to the fact that rabbits are instinctive behavioural chewers, since it is known that neuronal population and complexity of Mes V nucleus is proportional to the masticatory activities of the jaw muscles.

EISSN 2636-865X