Ventral Sheep Brain

[Up] [Lateral Brain] [Saggital Brain] [Ventral Brain] [Dorsal Brain] [Lab 7H]

A. Olfactory bulbs (for CN I); the olfactory nerves, themselves, pass through the cribiform plate (remember that?) from the olfactory mucosa of the nasal cavity; B. Optic nerve (CN II); At the optic chiasm (C), the optic nerves converge and many of the fibers cross over to continue in the optic tract (D) on the opposite side - the amount of crossing correlates with acuity of binocular vision; E. Infundibulum (attachment of pituitary gland); F. Oculomotor nerve (CN III); G. Trigeminal nerve (CN V); H. Vestibulocochlear nerve (CN VIII); the Facial nerve should be a small nerve between G & H; I. Pons; J. Medulla oblongata; K. Pyriform lobe.   What functions are attributed to the identified nerves?

The olfactory and optic nerves are sensory for smell and vision, respectively. The oculomotor nerve, as the name suggests, is motor to many of the muscles of the eye, including parasympathetic fibers to the ciliary muscles of the iris. The trigeminal nerve is sensory from the eye and face and motor to the muscles of mastication. The vestibulocochlear nerve is sensory for both hearing and balance.