44 
MAMMALIAN ANATOMY 
Foramina. —Numerous perforations in the cribriform plate 
of the ethmoid for the olfactory nerves; optic foramen for the 
optic nerve; superior orbital fissure for motor nerves to the eyeball 
muscles (oculomotor, trochlear, and abducent), and for the first 
branch of the trigeminal; foramen rotundum for the second 
branch of the trigeminal; foramen ovale for the third branch of 
the trigeminal; internal acoustic meatus for the facial and acous¬ 
tic nerves; jugular foramen for the glossopharyngeal, vagus, and 
spinal accessory nerves; hypoglossal canal for the hypoglossal 
nerve. (Cf. demonstration preparation of the human skull 
showing the course of the cranial nerves.) 
4. Bones of the Skull. 
Identify, by means of disarticulated skulls, the extent and 
boundaries of the individual bones, and add these outlines to all of 
the drawings in so far as they are visible , showing particularly the 
relation of the individual bones to the various features of the skull. 
In the final finishing up of the drawings , leave the outlines of the 
bones in lighter lines that they may not be confounded with the 
features of the skull as a whole. 
(a) Cranium. 
Frontal—1. 
Parietals—2. 
Occipital—1. 
Temporals—2. 
Auditory ossicles—3 pairs (Cf. demonstration preparations.) 
Ethmoid—1. 
Sphenoid—1 (In adult fused with occipital.) 
(b) Face. 
Nasals—2. 
Maxillaries—2. 
Zygomatics—2. 
Palatines—2. 
Inferior turbinated—2. 
Lacrimals— 2. 
Vomer—1. 
Mandible—1. 
