IV.B.1 Head: Nasal & Orbital Region Page 1 of 6

Objectives:

3.1.1 Identify the olfactory, optic, oculomotor, trochlear, abducens nerves and their branches.

3.1.2 Identify the foramen through which each of the cranial nerves exit the cranial cavity and include the components of each cranial nerve.

3.1.3 Understand the relationship of the nasal cavity to the anterior fossa, orbits and the cranial nerves.

3.1.4 Predict the functional deficits, which would result from damage to cranial nerves I, II, III, IV, VI.

Assigned Readings:

Moore's COA: Pages 842-844, 858, 898, 904, 908, 969-970, 1062-1068, 1070-1073, 1074-1077. See the blue boxes on pages 1086-1089 for clinical correlations. See the yellow boxes on pages 1070, 1072-1073, 1077 for "The Bottom Line."

Neuroanatomy: Pages 463-466, 503-518, 824.

Olfactory CN I

🔍 Tap on image to enlarge

	Step 1: Begin with the sagittal brain section.
	Step 2: Add the olfactory bulbs and nerves. Be sure to rotate the cadaver to appreciate the three dimentions of this system.
	Step 3: Notice that the olfactory bulbs sit on the cribiform plate which is part of the ethmoid bone. The ethmoid bone forms the central part of the nasal cavity. The nasal cavity circulates the air with the turbinates (Superior, middle and inferior concha) to allow for warming and smelling to occur. The nasal cavity also serves as the drainage point for the lacrimal ducts, the frontal sinuses, ethmoidal cells, sphenoidal sinuses and the maxillary sinuses.